Blaupunkt VPC 12D User manual

Brand: Blaupunkt

Model: VPC 12D

Type: User manual

This manual is also suitable for

Blaupunkt VPC 12D is a professional subwoofer with dual voice coils, designed to deliver exceptional sound quality and high power handling. Its unique construction, featuring a rigid spider design and double-thickness compressed foam surrounds, ensures linear cone movement and prevents tearing from over-excursion. The high-temperature voice coil, with four layers of windings on DuPont Kapton Polyamide, can withstand temperatures exceeding 400° Fahrenheit without damage. The VPC 12D performs well in sealed, vented, and bandpass boxes, offering flexible installation options.

Profe&ianal

Biuatity,

Dual

Subwuufers

Composant de

professionnelle

bobine

8 deux voix.

Sistemas

de altavoz de calidad

ssionaf,

con

componente

voz dual.

SubwcmWrs4e

qualidade

issional

corn

bobina

para

M&k&

the U.S.A.

New

Ve/ocifyTM

Pro Component features

System design guidelines

Dual Voice Coil advantages

Subwoofer enclosure types

Subwoofer enclosure construction

Installation guidelines

Additional reference information

Limited warranty information

Technical support

VPC8D technical specifications and recommended box designs

VPCl

OD technical specifications and recommended box designs

VPCl2D

technical specifications and recommended box designs

VPCI

5D technical specifications and recommended box designs

Blaupunkt technical support summary sheet (fax sheet)

Other notes

3,4

485

6,7

28,29

30,31

32,33

34,35

Caracteristiques

des nouveaux

VelocityTM

composants Pro

Principes de conception du

systeme

Avantages de la bobine mobile a deux voix

12,13

Types d’enceintes de subwoofer

13,14

Construction d’enceintes de subwoofer

15,16

Principes d’installation du

systeme

References

Garantie

limitee

Soutien technique

VPC8D

specifications techniques et conception recommandee des enceintes

28,29

VPCl

OD specifications techniques et conception recommandee des enceintes

30,31

VPCl2D

specifications techniques et conception recommandee des enceintes

32,33

VPCl5D

specifications techniques et conception recommandee des enceintes

34,35

Blaupunkt demande de soutien technique

(feuille

de fax) 36

Autres notes

TEMAS

Nuevas Caracteristicas

VelocityTM

Pro Component

Principios de

disefio

del sistema

Ventajas de una bobina doble voz

Tipos de

caja

del altavoz

para

bajas frecuencias

Construccidn de la

caja

del altavoz

para

bajas frecuencias

Principios de instalacidn del sistema

Information de referencia adicional

Information de la garantfa

limitada

Apoyo

Tecnico

VPC8D especificaciones tecnicas

diseiios

recomendados de la saja

VPCIOD

especificaciones tecnicas

diserios

recomendados de la

caja

VPCl2D

especificaciones tecnicas

diseiios recomendados de la

caja

VPCl5D

especificaciones tecnicas

disetios

recomendados de la

caja

Blaupunkt hoja de resumen de apoyo

tecnico

(hoja fax)

Otras

notas

PAGINAS

21,22

22,23

24,25

28,

30,

32,

34,35

_i_

VeiocityTM

”

VPC” Pro Component subwoofers in order to

intrqduce

a series of loudspeakers

offering unparalleled value in the car audio market. The VPC performance standards were

increased yet we were able to drive the speaker costs down using improved manufacturing

techniques and high technology materials.

Unique to the new

Ve/ocityTMwoofers

is the “Dual Voice Coil” Technology. The primary

advantages of this design include the improved loudspeaker configuration flexibility and the

potential performance increases from higher power handling. Best of all, the consumer can

often achieve the performance of two single coil subwoofers with one VPC dual voice coil

speaker.

This manual is composed of several sections and offers brief discussions in each area.

New PRO COMPONENT FEATURES lists technical advancements of the VPC woofers.

SYSTEM DESIGN GUIDELINES addresses system layout, sound quality, and amplifiers.

SUBWOOFER ENCLOSURE TYPES discusses the trade-offs of popular box designs with

SUBWOOFER ENCLOSURE CONSTRUCTION reviewing basic box building techniques.

INSTALLATION GUIDELINES examines additional automotive installation concerns and

ONAL REFERENCE INFORMATION offers additional technical references for those

o learn more about car audio. BLAUPUNKT WARRANTY INFORMATION for the

applicable country is noted. BLAUPUNKT TECHNICAL SUPPORT provides telephone and

fax support numbers and addresses with the BLAUPUNKT TECHNICAL SUPPORT

SUMMARY SHEET formalizes your tech requests so they can be mailed in and/or faxed in

to our technical support people. Finally, in-depth TECHNICAL DATA

fo<

all PC woofers is

provided.

speaking,

95%

of the car audio subwoofer installations made today really don’t need $400

woofers with 100

magnets! The VPC series woofers were designed for HIGH POWER

HANDLING LEVELS, HIGH SOUND PRESSURE LEVELS, and FLEXIBLE INSTALLATION

CHOICES.

HIGH POWER HANDLING was achieved

through a new ultra-linear long-throw

suspension with “bottomless” back plate

design allowing for tremendous cone

excursion without voice coil damage. The

new rigid spider design

(Blaupunkt

trademarked as “SPIDERMAX”) renders

spider tears a thing of the past. Double

DUSTCAP

thickness compressed foam surrounds

offer linear cone movement without tearing

from over-excursion. New Strontium

Ferrite magnets yield smaller magnet sizes

without reduced magnet strength but

retain their magnetic power far beyond the

expected life of the woofer. Four layers of

DuPont Kapton Polyamide voice

Jobbins

with “Armorcoat” allow for voice coil temperatures exceeding nearly 400”

Fahrenheit without damage.

New basket designs prevent the back of the cone from

slapping the steel frame thus avoiding acoustical distortions and possible cone damage.

Rear vented pole plates allow fresh air to move in from behind the woofer to cool the voice

coil plus help prevent dust cap “popping” at the excursion limits.

-l-

SUPERIOR PERFORMANCE PARAMETERS for the new VPC units were strategically

balanced so that low resonant frequencies could be achieved along with high sound

pressure levels.

Cone mass is held to a minimum for high efficiency yet its Acrylic Resin

Laminate

(ARL)

design yields tremendous rigidity. The lighter the cone the easier it is for

the magnet to move it in and out; therefore, higher sound pressure levels for a given

amount of amplifier power input. Additional loudness is achieved through longer cone

travel so we designed the PC units with 0.25 to 0.35 inches (6-8

mm)

of peak-to-peak

excursion which is rarely found in component woofers of this price range.

INCREDIBLY FLEXIBLE INSTALLATION is the real benefit to the new Pro Components. The

PC woofers perform well in sealed, vented, and

bandpass

boxes. Due to the low resonance

values, they also work quite well in infinite baffle installations where the woofer is mounted

on the rear deck of a car and uses the trunk for its enclosure.

The best investment in system design is planning time.

Before building a house an architect

completely draws building plans. Although small modifications are often made throughout

construction, 99% of the home is built as planned. Exactly the same attitude must be

followed in the design of a car audio system and we therefore refer to it as “System

Architecture”.

MULTI-WAY SYSTEMS

Although a simple head-unit with four

speakers will provide reasonable sound, a

really good system almost always requires

some kind of subwoofer. In order to

include the subwoofer speakers a dividing

network must be installed that keeps the

low frequencies out of the midrange

speakers.

“Two-way

”

“crossovers” have a

crossover point set of 80 to 100 Hz for

example. You can go crazy with additional

crossover points and amplifiers (three-way,

five-way, etc.) but these should be left to

the better retail installers or high-end

hobbyists.

HMbuNrr

ELEclRoNlc

CROSSOVER

SCHANNEL

AMPlJflER

SUBwooFER

SOUND QUALITY VS. SPL

A well designed sound system can provide good sound quality and still play loud. Above

about 120

(decibels) the sound isn’t perceived as getting much louder due to the

non-

linearities of the human ear. A loudspeaker with reference value of 90 d8 1 watt/l meter

will usually offer about 11 O-l 15

inside a car if driven by an amplifier of about 100 watts

(more than enough for most listeners).

Good sound quality is achieved when a system offers several sonic attributes. IMAGING is

the accurate rendition of instrument placement which can only be achieved with proper

loudspeaker placement. STAGING is an extension of imaging where a perceived listening

event is recreated with well defined height, width, and depth as with an actual sound

stage. Correct FREQUENCY RESPONSE implies that all frequencies within the range of

human hearing

(20-20

kHz)

are audible and balanced in relation to one another.

TIMBR

(pronounced Tam-bur’) is the system’s ability to reproduce the sound signature of a tru

so that it doesn’t sound like a trombone. LINEARITY is the systems ability to provide

consistent frequency response regardless of volume setting. Some systems sound “shrill”

at high levels if the tweeters are over driven. They may also sound weak at low volumes

due to our psychoacoustic hearing effects which we perceive bass loss at low levels.

-2-

SYSTEM PLANNING

The largest possible impact on any audio

system (home or car) is the quality of

loudspeakers used and their placement.

EFFICIENCY defines how loud a speaker

will play for a given input power and is

often quoted at 1 watt input and measured

at a 1 meter distance. When designing a

system you want to keep the component

efficiencies as close as possible. Always

match components for efficiency and

complementing frequency response to

.i.

...

.i_

ensure smooth transition from low

trequencles to hrgher ones for accurate

performance. Remember that for every 3

FREQUENCY

‘.

”

of increased efficiency

ISPL)

a speaker has over another, the end performance is as if

the amplifier has doubled it’s power output.

SPEAKER CONFIGURATIONS can become a problem in autosound installations. We would

hieve

a sound field in front of us (like a live concert) as compared to sound partly

front and partly behind us. This virtually dictates good midrange and tweeter

in front, usually mounted in the doors for good left/right balance, with high-pass

crossovers set greater than 80-100 Hz. For deep bass a subwoofer is required but is nearly

always located behind us in a rear trunk or hatch area. If the subwoofer crossover is too

high in frequency male voices can be heard “gurgling” out of the subwoofer speaker and

therefore pulls the sound-stage to the rear of the car, which is undesirable.

AMPLIFIER POWER is important but should be of lesser importance compared to speaker

choice and placement. Matching the rms (continuous) power levels to that of the speaker

is important but it should be noted that under-powering a system can often cause more

damage than slightly overpowering it. If the speakers are rated for 50 watts rms, you can

often drive them with a 100 watt power amp without concern. IMPEDANCE is the electrical

resistance to AC current flow and is typically 4 ohms for most car speakers. Impedance

loads for a speaker configuration shouldn’t fall below 2-4 ohms for most installations to

avoid amplifier overheating, regardless of manufacturer (Impedance = D.C. resistance of

the voice coil wire + A.C. resistance due to the coil of wire formed).

The Dual Voice Coil woofer is actually quite old in the home audio industry but still

relatively new to the car audio world. The largest advantage of the DVC woofer is in the

flexibility in installation. In order to raise the sound pressure level (loudness) in a car, you

can either add more speakers or add more amplifier power to drive a single speaker. Many

cars cannot fit two subwoofers and their necessary enclosure volumes but can easily fit

larger power amplifiers and a single woofer. Simply speaking, the DVC woofer allows you

to make up for speaker deficiencies with additional amplifier power.

There are basically four types of DVC installation: the ECONOMY MODE simply ties the

two voice coils together to yield more SPL; the LIMITED SPACE MODE uses higher

amplifier power to offset the need for a separate subwoofer and its enclosure; the

FLEXI-AMP MODE allows you to add a subwoofer to either a factory speaker installation or

channel amp in a “Tri-Mode” configuration; the HI-SPL MODE increases the perceived

Pressure Level in the car’s bass by loading down the output impedance of the

amplifiers thus‘achieving higher output power from the amplifiers. For any speaker loading

mode, care must

be taken to avoid loading the amplifier’s output below it minimum

impedance value

(e.g., 2 ohms).

-3-

Economy Mode

Flexi-Amp Mode

Limited Space Mode

HI-SPL Mode

e movement 0

e woofer cone back and forth. If a woofer cone

moves forward creating a positive pressure wave, this same motion creates a negative

pressure at the back of the woofer. If these two waves combine due to the lack of a wall

separating the front of the speaker sound from the back, the output from the woofer is

effectively canceled thus substantially reducing the bass output of the speaker. This wall is

absolutely necessary and is referred to as an acoustical “baffle”. It can be accomplished

using a box of some kind or simply the rear package shelf of an automobile to isolate the

front and back waves of the speaker.

THIELE-SMALL PARAMETERS

Every woofer has its own electromechanical characteristics which are called THIELE-SMALL

parameters. The three most important parameters include RESONANT FREQUENCY

(”

the frequency where the speaker moves with the least mechanical resistance), TOTAL

(“Qts”

the “magnification” of the cone movement at its resonant frequency), and

VOLUMETRIC COMPLIANCE

(“Vas”

the equivalent volume of air that the woofer cone can

displace for a given power input). Using these parameters we can then calculate an

optimum box volume for a particular woofer and reasonably predict its frequency response.

-4-

COMMON ENCLOSURE TYPES

In the car audio world there are 5 types of subwoofer enclosures commonly used; INFINITE

BAFFLE, SEALED BOX (closed box), VENTED BOX (bass reflex), SINGLE-VENTED

BANDPASS (often incorrectly referred to as “5th” order), and DUAL-VENTED BANDPASS

(often incorrectly referred to as “7th” order). No single design is superior because each has

its own compromise in performance, power handling, and design complexity. The

bandpass

name implies a “built-in” acoustical response which has a natural

highpass

response

Hz for example) but also a

lowpass

response suppressing high frequencies (e.g.,

>80

Hz).

INFINITE BAFFLE designs simply use the trunk of the car

for its acoustical enclosure and the rear deck to isolate the

front and rear sound paths. Advantages include simple

installation and adequate performance for most systems.

Disadvantanes include poor power handling capability and

substandard transient response.

ED boxes offer one of the best compromises in

handling and performance. Because of the “air

”

provided by the box the advantaqes include simple

box construction, high power handling, excellent transient

response, and smooth low frequency roll-off.

Disadvantaqes include only moderate efficiencies at low

frequencies and the need for large box volumes.

VENTED boxes extend the low frequency response below

that of the sealed box by using a port tube. Advantaqes

include extended low frequency response, lower distortion

due to smaller cone movements in its passband, good

efficiency, good transient response, moderate size boxes,

and high power capacity. Disadvantages include increased

complexity in box design and possible woofer damage due

to over-excursion of the woofer cone below the cut-off

frequency of the vented box.

SINGLE-VENTED BANDPASS boxes are relatively new

(about 5 years in the

car)

but offer some advantages of

both the sealed and vented designs. Advantaqes include

reasonable efficiency, small box volumes, good transient

response, extended low frequency performance, and can

be used with very high power amplifiers. Disadvantaqes

include slightly lower efficiency compared to a vented box

and increased complexity in box design and construction.

DUAL-VENTED BANDPASS boxes vent the sound from the

front and back of the woofer through individually tuned

osure on the front and rear of the woofer. The

antaqe of this design is its high efficiency over a

narrow frequency band. Disadvantaaes include complex

design and construction, large box volumes, poor transient

response, and susceptibilities to cone over-excursions

(damage) for sound outside its primary frequency band.

-5-

ISOBARIC WOOFER

CONFIGURATIONS

Increasing in popularity in recent years is

the compound woofer design, more

commonly known as the “isobaric” design.

Isobaric actually means “constant

pressure” which is the case having two

woofers moving an encapsulated pocket

of air between them in the same direction.

This arrangement acts like a single speaker

which effectively reduces the required box

volumes for a subwoofer system by 50%

which is substantial if you are space

limited. Unfortunately, the trade-off for

space is the 3

loss in efficiency but this

is usually recovered with increased

amplifier power. Care must be taken to

avoid air leaks between the two woofers

and final speaker wiring and impedance

loads must be carefully watched.

Before starting final box assembly some basic construction issues should be mentioned:

Infinite baffle construction in a car is done by simply cutting a piece of wood which will

act as an acoustical divider isolating the front and rear sound of the woofer. This piece

of wood is mounted inside the trunk of the car under the rear deck, or against the back

of the rear seat, and should have some kind of caulking to seal off all residual air leaks.

Box

constructiop

can take on nearly any shape since we are dealing with

low frequencies. Odd shapes that are difficult to cut and glue should be avoided.

Particle board, MDF, or high grade birch plywood are good materials to build boxes with

thicknesses of

5/8”-3/4”

(12-16 mm). Solid wood panels should actually be avoided

because of vibration potential and wood warping over time.

All seams in the box should be glued, screwed, and caulked to prevent wall separation

over time due to vibration and environmental changes within the car.

Cross bracing is important for large boxes to prevent wall vibration.

Acoustical damping material (fiberglass batting 2-4” thick) attached to 50% or more of

the interior walls helps reduce box noise and also increases the box volume seen by the

woofer by

lo-20%.

Spraying the inside walls with a damping material, such as tar

based automotive undercoating, also helps dampen wall resonances.

The final box should be rock solid and air tight but should also remain serviceable

should a woofer be damaged for any reason.

5-way binding posts for electrical connection offer reliable connections and easy

removal of the box for service or theft protection.

When possible, use

4”,

5”, or 6” diameter port tubes to avoid wind noise from smaller

diameter sizes. PVC plumbing pipe in 2, 3, 4, 5, and 6” diameters is available at most

hardware stores with “elbow” pipes allowing you to bend the tubes inside the box.

Try to always use active (electronic) crossovers built into most power amplifiers.

Regarding simple vented boxes, you cannot achieve lower frequency response by

simply lowering the port tuning frequency. This will severely

overdamp

the box

frequency response therefore yielding less bass and lower power handling.

The distance between the woofer and its port should be less than 12” if possible.

-6-

During box construction, temporarily assemble the box to make sure all pieces line up

properly. Then assemble all pieces before cutting out the holes for the woofers. Once the

box is fully assembled, connect an oscillator/amplifier to the woofer, sweep it through 20-

100 Hz, and listen for strange air whistling noises, buzzes, and rattles. Since the box will

eventually be mounted in a car it should be firmly fastened down. Simple

“L”

shaped

brackets work well.

BASIC MATH CALCULATIONS

To build a subwoofer box some very basic math calculations must be made accurately

referencing the formulas and drawings below:

VOLUME AND AREA CALCULATIONS

AREA:

VOLUME:

Circle (port opening) A = 0.79 x d x d

N/A

Rectangle

A=hxw

N/A

Triangle

A=0.5xhxw

N/A

Cylinder (Port tube)

N/A U = 0.79 x d x d x h

Rectangular box

N/A

V=hxwxd

N/A

V =

0.5xhxwxd

AREAS

-w-

VOWNES

c--w

--cl--

Speaker parameters and box calculations often need some kind of math conversions in

order to make the numbers easy to work with. Some common conversions are listed

below:

VOLUME AND AREA CONVERSIONS

TO CONVERT FROM: MULTIPLY BY:

TO GET:

Inches

0.0254

Meters

39.37

Inches

uare inches

pf”,

0.007

Square feet

‘k

,are

feet 144

Square inches

Cubic inches

0.00058

Cubic feet

1728

Cubic inches

Liters

0.035 Cubic feet

-7-

We recommend that you have your Blaupunkt woofers professionally installed. If you

choose to do your own installation please note the following important information.

Before cutting any trim or steel make sure you clear all moving parts and factory

electrical lines.

Be sure to leave enough slack in the wire to prevent pulling or stretching wires for

service later.

Tie down all loose wires to prevent them from getting caught in moving parts or shorted

due to abrasion over time.

Never mount speakers in a car’s wheel wells or areas where they might be subjected to

moisture or road spray.

Proper speaker polarity must be observed. The polarity positive side is marked by a

(+)

sign or a red dot. At low frequencies woofers out-of-phase will acoustically cancel

having little bass output.

Although the components used in Blaupunkt speakers exceed most international

standard, speaker frames can be twisted by improper installation on uneven surfaces.

This can occur when the surface is heavily padded or carpeted and the screws are

unevenly or over-tightened.

When installing more than one speaker per amplifier channel be sure that the

combinr’

-.‘h

impedance values cannot damage the amplifier.

+@lJ

Speaker wire should be isolated from the electrical system of the car and routed away

from any factory systems to avoid noise picked up and fed back to the amplifiers.

Speaker wire size should be of sufficient size to carry the full power of the amplifier (16

gauge or larger sizes are quite adequate for most systems).

The following is a list of materials and sources of recommended reading for the person

interested in loudspeakers, acoustics, and electronics. Subjective comments are listed

accordingly.

DESIGNING, BUILDING, AND TESTING YOUR OWN SPEAKER SYSTEM, David B.

#1964,

Blue Ridge Summit, PA, 17294. (This is

an introductory book on designing speakers for the home but is quite applicable to the

car and is easy reading)

LOUDSPEAKER DESIGN COOKBOOK, Vance

Dickason,

Old Colony Sound Labs, Peterborough, NH, 03458. (This is a technical step up from

Weems addressing complex woofer box and crossover designs but is excellent for

reference.)

SPEAKER BUILDER MAGAZINE, P.O. Box 494, Peterborough, NH, 03458. (This is a bi-

monthly hobbyist speaker magazine but offers tremendous technical information for the

professional as well.)

AUTOSOUND 2000 TECH BRIEFS, 2563 Eric Lane, Suite D, Burlington, NC, 27215.

(A2TB is a bi-monthly magazine with very current technical information directly related

to the car stereo world. Although sometimes technical, it’s well written therefore easy

to understand.)

“BLAUBOX” WOOFER BOX DESIGN COMPUTER PROGRAM, Blaupunkt division of the

Robert Bosch Corporation, 2800 South 25th Avenue, Broadview, IL, 60153. (This is

an IBM personal computer program used to predict the frequency response of a

subwoofer in 10 different enclosures including sealed, vented, bandpass, and isoba

configurations. Two woofers can be graphically compared in different boxes if desi

In addition, it will print out wood cutting “blueprints” to actually build the box with.

Passive Crossover designs are included. The program is sold through authorized

Blaupunkt retailers and distributors.)

-8-

The Robert Bosch Corporation warrants new Blaupunkt loudspeakers and accessories it

distributes in the United States to be free from defects in material and workmanship in

accordance with the following.

n For twelve (12) months after delivery to you, the original consumer purchaser, we will

repair or replace at no cost to you. However, this warranty does not cover expenses

incurred in the removal or reinstallation of any unit whether or not proven defective.

To obtain performance of this warranty, contact the nearest Blaupunkt dealer. A dated

purchase receipt or other proof that the product is within the warranty period will be

required in order to honor your claim.

n This warranty is limited to the original purchaser and is not transferable.

Specifically excluded from this warranty are failures caused by misuse, neglect, abuse,

improper operation or installation, or unauthorized repairs.

To the extent of the law, this warranty sets out your exclusive remedies with respect to

products covered by it, whether for negligence or otherwise. We will not be liable for

consequential or incidental damages, losses, or expenses. THIS WARRANTY IS IN LIEU

OF ALL OTHER EXPRESS WARRANTIES. ANY WARRANTV IMPLIED BY LAW,

WHETHER FOR MERCHANTABILITY OF FITNESS FOR A PARTICULAR PURPOSE OR

OTHERWISE, SHALL BE EFFECTIVE ONLY FOR THE PERIOD THAT THIS EXPRESS

!@9

WARRANTY IS EFFECTIVE. No attempt to alter, modify, or amend this limited warranty

‘\..:’

shall be effective unless authorized in writing by an officer of the Robert Bosch

Corporation. Some states do not allow limitations on how long implied warranties last,

or the exclusion or limitation of incidental or consequential damages, so the above

limitations or exclusions may not apply to you. This warranty gives you specific legal

rights and you may also have other rights which vary from state to state.

This warranty is void for damage occurring during shipment and for,products with

defaced serial numbers or date code markings.

For further information regarding this warranty, please contact the Blaupunkt division of the

Robert Bosch Corporation, 2800 South 25th Avenue, Broadview, Illinois, 60153, attention

department

UA/CSV.

Products sold outside of the United States fall under the warranty

limitations of that country and its Blaupunkt division requirements.

We will make all reasonable efforts to help you, the end purchaser or Installation

Technician, to competently install these components. The Blaupunkt technical data

provided should assist in designing good subwoofer enclosures and answer most technical

questions.

Multiple computer programs currently exist for designing subwoofer enclosures but we

particularly recommend the “BLAUBOX” program offered by Blaupunkt through our retail

outlets. This IBM PC computer program easily and quickly assists in comparing the

acoustical frequency response of different woofers in different enclosures in hopes of

preventing a poor woofer/box combination.

BLAUBOX also prints out wood cutting

blueprints for tubular, rectangular, and wedge shaped enclosures so errors are virtually

eliminated by the user.

We realize there may be some very unique installations being done so we prepared a “fax

help” page that can be faxed or mailed to us which we will in turn answer as promptly as

possible. If you have other technical questions or would like additional literature on other

Blaupunkt products please contact our offices at:

Blaupunkt division of the Robert Bosch Corporation

F”

2800 South 25th Avenue

‘Broadview, Illinois, 60153 USA

708

865-

5200

Thank you for buying Blaupunkt..... BLAU NOW!

-9-

8”

SUBVVOOFER

TECHNICAL DATA

Nominal diameter

8.0 in

(2OOmm)

Magnet weight

(0.56kg)

Nominal impedance

(ea. coil)

DC resistance

(Re)

2.36

(ea.)

Resonance frequency

(fs)

41 Hz

Total

factor

(Qts)

0.45

Mechanical Q

(Dms)

8.50

Electrical

(QesI

0.48

Equivalent air volume

(I/as)

0.85

ft3

(23.9

ltr’s

Air volume displacement

0.07

ft3

(2.0

Itr’s)

Effective cone area

(Sd)

33.2

in2

(0.021

Compliance

(Cms)

3.7 x

lo4

M/N

Moving mass

(Mms)

1.4

(419)

Voice coil diameter

1.5”

(38.lmm)

Voice coil former material Kapton polymide

Voice coil induct’ce

(@lOOHz)

0.65

(ea.)

Linear excursion

(Itmax)

0.20 in (5.1 mm)

Force factor

(8f)

7.2 Tm

Acoustical efficiency (No)

0.40 %

Continuous power

(Pe)

16OW

(320 peak)

Sensitivity

(SPLI

dB,

2.83v/lm

dB,

lW/lm

. .

(210

I-

5.80”(14~3

mm)

7.00”(17s

mm)

Woofer outline drawing

mechoic

woofer response

The VPC8D woofer offers the best performance/box size compromise

usin

0.75-l .OO cubic foot Vented box. The Sealed box drives the -3dB frequency very

high

(>80

Hz). An Infinite Baffle mounting (rear package shelf) is recommended only

for low power systems

(

< 75 watts) due to possible over-excursion of the driver.

The Slngle-Vented

Bandpass

box offers a slightly lower -3dB frequency than the

Vented box but the efficiency will drop considerably. The Single-Vented

Bandpass

box should therefore be used for installations requiring very high power handling

100 watts) yet requiring the low cutoff frequencies offered by the Vented box.

(Parameter values may deviate

slightv

in production units

but

the perceived performance variations will be negligible.)

-28-

SINGLE-“ENTED

BANDPASS

BOX

“T

’

Togl

bon

VoLm

<Ml>

120

0.25

0.50 6.20

15.30

110

0.30

0.70 6.40

15.40

loo

030

0.95

720

17.30

0.25

1.25

9.70

<NR>

<r-m>

1.50cu.ft.

0.25cu.ft.

mOlp

2On

VENTED BOX,

0.5 vs. 1.0

cu.ft.

10,

mu______________________

100

BANDPASS

BOX,

1.0 vs.

1.5

cu.ft.

1 5

cu.Pt.

/+‘.

lrn

[The

data above is offered as a “starting point” for comparison purposes because these designs are only a few of many possible

box configurations.

sure to account for the air volume displacement of

the

woofers and the port tubes.

<NR>

= NOT A RECOMMENDED APPLICATION

-29-

IO” SUBWOOFER

TECHNICAL DATA

DC resistance

(Re)

3.12

Q (ea.)

Electrical

(Qes)

0.38

Equivalent air volume

(Vas)

Air volume displacement

Effective cone area

(Sd)

Compliance

(Crns)

Moving mass

(Mms)

1.90

ft3

(53.8

ltr’sl

0.14

ft3

(4.0

hYs)

56.7

in2

(0.037m2)

2.8x1@

M/N

2.4

(67n)

Voice coil diameter

2.0”

(50.8mm)

Voice coil former material

Voice coil induct’ce

(@lOOHz)

Kapton polymide

0.70

(ea.)

Linear excursion

&naxI

Force factor

03ll

0.25 in

(6.4rnm)

11.3 Tm

Acoustical

efficiencv

(No)

0.70 %

Continuous power

(Pe)

180W (360 peak)

9.OOWO

mm)

wooter

outllne

drawing

Sensitivity

(SPL)

. I

dB,

2.83vtlm

Anechoic

woofer response

dB,

lW/lm

The

VPClOD

woofer offers the best performance/box size compromise using a simple

1.0-l .5 cubic foot Vented box. The Sealed box pushes the -3dB frequency high

80 Hz) but this unit will work well in an Infinite Baffle mounting (car trunk) if using

moderate power levels

100 watts rms) to prevent bottoming of the woofer cone.

A 1.75 cubic foot Single-Vented

Bandpass

box offers a slightly lower -3dB frequency

compared to the Vented box. The

Bandpass

unit has considerably more power

handling compared to the Vented box (100-l 50 watts) but this is traded off for

slightly lower efficiency and increased construction complexity.

(Parameter values may deviate

srihtiy

production units but the perceived

perfom3ance

variations will be negligible.)

-3o-

I”“”

BOX

Mmba

lube bmd

ms.

mTh

ewy

laz’

lw3’

pat

SEALED BOX,

vs.

1.5 Cu.ft.

Irn

zm sm

VENTED BOX,

0.5 vs. 1.5 CU.ft.

BANDPASS

BOX,

1.25 VS. 1.75

cu.it.

zm sm

TThe

data

above

is offered as a “starting point” for comparison purposes because these designs are only a few of many

possiblf

box configurations. Be sure to account for the air volume displacement of the woofers and the port tubes. 1

<NR>

= NOT A RECOMMENDED APPLICATION

-31-

12” SUBWOOFER

TECHNICAL DATA

Nominal diameter

12.0 in

(3OOmm)

Magnet weight

(1.14kg)

Nominal impedance

(ea. coil)

DC resistance

(Re)

2.90

(ea.)

Resonance frequency

(fs)

35 Hz

Total

factor

(C&s)

0.42

Mechanical

(Qms)

8.14

Electrical

(Qes)

0.44

Equivalent air volume

(Vas)

3.40

ft3

(96.2

ltr’s

Air volume displacement

0.19

ft3

(5.2ltr’s)

Effective cone area

(Scf)

82.5

in2

(0.053m2

Compliance

(Cms)

2.4x

lo4

Moving mass

(Mrns)

3.0

(849)

Voice coil diameter

2.0”

(50.8mm)

Voice coil former material

Kapton

polymide

Voice coil induct’ce

(@400Hz)

0.75

(ea.)

Linear excursion

&ax)

0.25 in

(6.4mm)

Force

factor

(Bf)

ll.OTm

Acoustical efficiency (No)

0.93 %

Continuous power

(Pe)

200W

(400

peak)

Sensitivity

(SPL)

dB,

2.83vllm

dB,

lW/lm

12.20”

(310

mm)

5.60”

143

mm)

Woofer outline drawing

(Parameter

values

may deviate slightly

production units

but

the

perceived

petfonnance

variations

win

be negligible.)

Anechoic

woofer response

The

VPC12D

woofer provides the best performance/box size compromise using a

1.5-

2.0 cubic foot Vented box. The Sealed box designs drive the -3dB frequency high

Hz)

but the woofer cone has enough area that it will begin to “pressurize” the

car interior therefore offering strong bass performance.

Infinite Baffle mounting (rear

deck mounting) works well for moderate power levels

(@lo0

watts) due to the

pressurization principle noted above.

A 1.75 cubic foot Single-Vented

Bandpass

box will offer overall performance about

equal to that of a Vented box along with greater power handling (100-200 watts).

But, for many people, the box construction will require above average carpentry skill

-32-

SINGLE-VENTED

BANDPASS

BOX

SEALED BOX,

0.75 vs.

2.0 cu.ft.

110

lm..----------_____________

___-_

. .

lrn

VENTED BOX,

0.75 vs.

2.0

cu.it.

BANDPASS

BOX,

1.75 vs.

3.5

cu.ft.

__------------_--_

1.75

Cu.ft.

.*I'

,,/n’d

"'<

-ml_-_--__-__

,a*'

_"'s,,_

,,/*

'I*,,

3.5

cu.ft.

'.a,

. . . . . . . .

. .

)(z

zoo

IThe

data above is offered as a “starting point” for comparison purposes because these designs are only a few of many

possibk

box configurations.

f3e

sure to account for the air volume displacement of the woofers and the port tubes.

]

< NR> = NOT A RECOMMENDED

AP!WCATlON

-33-

15”

SUBWOOFEB

TECHNICAL DATA

Nominal diameter

15.0 in

(38Omm)

Magnet weight

40 oz

(1.14kg)

Nominal impedance

(ea. coil)

DC resistance

(Re)

3.08

(ea.)

Resonance frequency

(fs)

25 Hz

Total

factor

(C&s)

0.46

Mechanical

(Qms)

8.50

Electrical

(Qes)

0.49

Equivalent air volume

(vas)

9.50

ft3

(268

ltr’s)

Air volume displacement

0.36

ft3

(10.2 hr’s

Effective cone area

(Sd)

132

in2

(0.086m’)

Compliance

(Cms)

2.6 x

lo4

M/N

Moving mass

(Mms)

4.8 oz

(13591

Voice coil diameter

2.0”

(50.8mm)

Voice coil former material

Kapton polymide

Voice coil induct’ce

(@4OOHz)

0.85

(ea.)

Linear excursion

&nax)

0.35 in

(8.9mm)

Force factor

(Bl)

11.6 Tm

Acoustical efficiency (No)

0.98 %

Continuous power

(Pe)

220W (440 peak)

Sensitivity

(SPL)

dB,

2.83v/lm

dB,

lW/lm

15.20”

(386 mm)

o!w

(13

mm)

;.90”

175

mm)

._.

Woofer outline drawing

Anechoic

woofer response

The

VPCl5D

woofer offers the best performance/box size compromise using a 3.0

cubic foot Vented box. The Sealed box pushes the -3dB frequency above 50 Hz but

an Infinite Baffle (trunk installation using the rear deck or back of the rear seats) can

offer tremendous results simply due to the pressurization of the car’s interior from so

much woofer cone area and movement.

A Single-Vented

bandpass

box approaching 6.0 cubic feet must be constructed to

provide the -3dB frequency similar to a Vented design. The advantage with the

bandpass

design is its tremendous power handling potential (200 watts +

(Parameter values may deviate

slightly’in

prcduction

units

but

the perceived perbrrnance variations will be negligible.)

-34-

BOX

SPL

0.75

<MI>

1.00

<NI>

1.50

155

140 15.75 111.15 193

SINGLfi-VENTED

BANDPASS

BOX

2.25 94

120 70

2.0

1.5

0.75

1.75 94

25 95

50 2.0 4.0 3.80

6.90 88

SEALED BOX,

1.5 vs. 3.0

Cu.ft.

. .

VENTED BOX,

1.5 vs. 3.0

Cu.ft.

110

Im..--__________--

__,_____-_--__-

. . . . , . . :

. .

Irn

110

BANDPASS

BOX,

3.5 vs. 6.0 cu.ft.

10 50

n2 200

data above is

offered as a "starting

point” for comparison purposes because these designs are

only

a few of many possible

box

connations.

Be sure to account for the air volume displacement of the woofers and the port tubes.

<NR>

= NOT A RECOMMENDED

A!‘PLlCATlON

-35-

If you have questions regarding the Blaupunkt PC woofer products and/or installation,

please fill out this sheet and return by fax or mail. (At this time we can only provide

answers in English.)

FROM.

NAME:

COMPANY:

STREET:

CITY & STATE:

ZIP CODE:

TODAY’S DATE:

DAYTIME PHONE:

DAYTIME FAX:

FAX OR MAIL TO:

BLAUPUNKT TECHNICAL SUPPORT

2800 SOUTH 25TH AVENUE

BROADVIEW, IL 60153

(FAX) 708-450-8554

(VOICE) 708-865-5200

NUMBER OF PAGES TOTAL:

1. What enclosure type do you have or want?

[

sealed

1 vented

[

bandpass

[

isobaric

[

]

other (define)

2. What Blaupunkt woofer model numbers are you working with?

How many woofers are in the same cabinet

How many port tubes do you have or want?

Diameter and length of each?

5. Do you want round (PVC pipe) port tubes or square?

[

round

[

square

What is the total cubic volume of the enclosure you have or want?

(Maximum h x w x

How much amplifier power are you applying to each woofer?

[

1 cubic feet

liters

Is there any other information we should know about your system?

Please draw box designs or add additonal information we might need for your system

below:

-36-

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Blaupunkt VPC 12D User manual

Brand: Blaupunkt

Model: VPC 12D

Type: User manual

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