MR/14A
OPTRATING
GUIDE
BrAMP
SYSTEMS, rNC.
11000
sw ltrh
Beaverton, OR
97
00
5
P. O.
Box
7
28
Beave rton
,.
OR
97
07
5
INDTX
Section I
General
description
Introduct i on
Identi
fication
of Cont,roLs
Description
of Controls
Applicat,i
on
and
0perati on
Secti on
I I
Inputs and
0ut,puts
Speci
fi
cat
i ons
Warrant
y
1
2
3
3
l+*5
*6
7-B
9
10
General
Description
Reverberation is a result of multip1e,
blended sound
images
caused by reflections
from
walls, floor
and ceiling.
The MR/140
creates this effect by electronic
and mechanical devices,
bringing
forward a new dimension of full, clean
and rich sound
in a
1ow
cost
stereo reverberation sysLem.
The all new Biamp
VIR/14O Channel
Reverberation
System represents the
latest in low noise, high slew
rate technology. A specially designed
type-9 Accutronics spring
assembly results
in
extended frequency
response
and
reverberation
quality
never before heard in a
low
cost spring reverberation unit.
Features
Automatic
hard
limiting
with LED
indicator.
Low noise
reverb
pick
up
amp.
Extended
hiqh
frequency response.
Unique EQ
blend
system
for total
EQ
control.
Low
noise.
High
slew rate.
Rugged
19't rack
mount
desi
gn
.
Latest Circuit Designs
The
special design reverb assembly adds new character and
presence
never heard in other spring
reverbs.
High slew rate and low
noise
generates
unadultered rich
reverberant
sound. Couple this technology
with a non-interacting 4 band
EQ
Blend
System and
you
can virtually
create
a
precise
reverb effect for any
instrument.
The MR/140 is com-
patible
with any application of
equipment.
For
interfacing,
the MR/140
employs both balanced XLR and
f;"
phone
jacks
and unbalanced
inputs
and
outputs. The low
noise
makes
it
unnecessary
to remove the MR/140 when
reverb
is
not desired.
SECTION
I
INTRODUCT
ION
Automatic hard limiting
provides
protection
against annoying
Itspring
slapn resulting from overdriving
the spring.
Even
with
percussion
instruments,
the
input level can
be optimized'
for maximum
performance
by
monitoring the drive
set. light-
emitting diode
(LED)
mounted on the front panel.
BIAMPfS
exclusive
'rEQ/Bfendrr
System
brings a new dimension
of
precise
equalization
to the reverb
sound. Four
independent, non-
interacting controls
permit
adding the reverberation
effect to
the
dry signal
at any of the four frequency
ranges
provided.
Ruggedly designed for use
in
recording, portable
sound
rein-
forcement systems,
permanent
installations,
monitor systems,
audio-visual systems,
and broadcast
and
production
application,
the BIAMP NlR/14O
provides
the ultimate
sound
in
spring rever-
berati on.
-
The
unique sound
quality
of the
BIAMP MR/140
is
due
to four
major design
features:
1
)
The spring system utilizes
a type-9
accutronics assembly
resulting
in
more
resonant
nodes
per
hertz.
2) A
built-in
limit.er elect,ronically
limits the rise
time of
the signal,
which
eliminates
the
rrspring
soundrr of spring
reverberation
units.
3) 4-band EQ Btend System which
permits
adding
the
rrwet
soundf'
at the desired frequencies.
This rdsults
in added
flex-
ibility available
in
no other spring reverb unit.
4) High
performance
electronics
for
exceptionally
low distor-
tion
and noise. The straight through electronics
are so
good
that they
will
have
no
effect
on
your
sound
quality
even
in
the
most demanding studio
applieation.
IDENT
I
F
I
CAT
I ON OF CONT
ROL
S
Input
Level
Control
Bal
ance
Cont,
r
ol
(control
1?6
of
reverberat
i
on
)
Input
Level
Indi
cator
(
ori
ve
set
)
Uni
que
I+
Cont
ro1
s
Band
-
for
Equal
i
zati
on
reverb
signal
0utput l-eveL
Cont
r o1
DESCRIPTION
OF CONTROLS
Input Level
Controls the amount,
of
input
drive
to
the PIR/140.
If used
in
line,
this
control should
be
about 5O96 of rotation
for maximum
signal
to noise.
LED
(orive
Set
Level)
Input flashing should
be adjusted such
that this
LED is flashing,
not
fully
on.
Four Band
EQ Blend
These are not
cut and boost controls.
Each
knob
sets
the volume level of a
band
pass
network,
sent to the tone
blend mixer.
Therefore, eaeh
EQ band
permits
adding the wet
sound at the desired
frequencies.
Frequency
centers
are 13OHz, 500H2,
1.8K,
& 6K.
Bafance
Setes ratio
of non-reverb
signal to
reverb signal.
Mainly used when
unit
is
placed
"in
line'r,
where no
effects
channel
is
used.
0utput Level
Adjust
for proper
output
level to match
system
in
use.
If set too hot,
this
will effect signal
to noise.
MR/14A
APPLICATION
AND
OPERATION
The MR/140
is a
"line
levef"
device
and
can be hooked-up
in two basie
ways.
In-Line Operation
Placing the
unit after any mixer
will
add the reverb
effect to
the
in-line
signal
patch.
When using the l"1R/14A
"in-line",
utilize
the balance
control to blend
the
wet and dry signals.
SPEAKER
EQUALIZER
POWER
AMP
MIXER
MR
/ t40
Return
to
Mixer
0peration
Illustrating
the
use
of
the
l,lR/
14O for
the
wet
and returning the
processed
or
wet signal
back
mixed
with
the
dry
signal
in
the console.
signal
(
reverberation
onl
y
)
to the
mixing
console
to be
MR/t40
SPEAKER
MIX
ER
EQUALIZER
POWER
AMP
effecis
The
illustration above
represents
connecting
the echo send
jack
of the mixing
console to the l"lR/140
input and
the
output
of the l4R/14O to
the echo return
jack
or an
input channel.
If this method is
used, the
balance
control
would
be
turned
clock-wise to full
reverb
or wet
signal.
chonnel
polch
MR/ r
40
SPEAKER
POWER
AMP
EQUALIZER
MIXER
Inserting
the
input
of
a
mixing
console
channel
.
and
output at
will
add the
the
channel
patch
reverb
t,o
onl
y
the
4
point
of the
input
channel
voice
or instrument
0n that
Hook
up
1.
2.
MIXING
\^/ET
& DRY WITHIN
THI
MR/14A
SINGLE OIJTPUT
METHOD
Connect
shielded cable from mixer
or
recorder
to the
input
of
the l,1R/140,
(standard
phone
plugs
use unbalanced
input).
Connect
shielded cable from the
output of the
MR/140 to
power
amplifier or recorder input.
Set t.he output level- of the MR/140 to
5096 of its rotation.
As the output level control is turned
in a clockwise ro-
tation,
the siqnal coming out of the
MR/140 will become
stronqer,
up to
+1BdB. This
f,eature
is
handy for
com-
pensating
for differences in
equipment.
Set
input
drive
control, balance control
and
equalizers half-
way
on
(lines
on
knobs
in
verticat
position).
Send
signal t.hrough MR/140.
Monitor or listen
to reverberated siqnal.
Adjust
drive
control
so that the drive set
light flashes. If
control is
set too low, the
green
light will
not
flash.
If
control is
set too high, the
green
light will
remain lighted
and
will not flash. When
liqht
is flashing,
your
reverb sound
quality
and noise characteristics are automatically
set for
maximum
performance.
Adjust
balance
control-
(amount
of
reverberalion).
Turning
the
balance control all
the way up to the left will allow only
non-reverberated
siqnals
to
pass
through
the MR/140. When
the
bal-ance control is in
this
position,
the
reverb
circuit
will
be
inactive,
other
than being able to set levels with output
and
input
level control-s.
0peration
3.
4.
1.
2.
5.
5.
0peration,
(
continued
)
It is
not necessary to switch
out or disconnect
the
I4R/14O
when reverb is not required
because
of the
extraordinary low noi.se, distortion
and
high slew
rate
of
this product.
As the balance control is turned from far
left
(Dry
10), toward 0,
reverberation
will be added to the
signal
passing
through the'unit.
Turning the
balance
control fully to the
right
(
to reverb
10),
will allow
only the reverberated signal at the
output of the unit.
While
the
balance control is
in this
position,
turn the
equilizers
one at a time
to
their
maxi-mum
positions.
The
four
equalizer control-s only
effeet
the
reverber-
ated
portion
of
the
signal, so that full control of
the sound
of the reverberated effeet
can
be achieved.
10.
Now that
you
have fully experimented
with the equalizer
control.s,
move the balance control
to blend the reverb
and
dry signal to
your
best
preference.
USING
THT I,IR/14A
FOR t/\|IT
SIGNAL ONLY
7.
B.
9.
The wet signal
only is
the output signal
from
an echo
return or line
blend
control
to
fuIl
the
same
as the
wet
the
YIR/ 14A is
sent
channel.
For
this
wet.
and
dry
method
except
back
into t,he
mixer
to
application
r
turn
the
SECTION II
HOOK
-UP
OF
STIREO
\"
PHONE TO
BALANCTD I. I NE
3
I
4
/
GRND,
HOT
a\
\_.
I
lt
52
I
3
TRANSFORMERLESS
BALANCED
INPUTS
Transformerless
balanced input circuits employed in the
BIAMP
l'IR/140 offer
many advant,ages over transformer coupled
lines.
*
Higher Slew Rate
J+
Less
hum
(
Itto
Transformer
Mag-
netic
Hum Pick-up
)
(
Without
saturation
Lower Distortion
Extended
Frequency
Response
Better
Headroom
of
transformers
)
tf
Jf
p
robl
ems
Unity
gain
and
the
correct
phasing
balanced
inputs are
maint,ained
in
circuit.
for
both balanced
and un-
the
l"1R/
1t+O
trans f ormerl
ess
Interconnecting
transformerl.ess
balanced lines
is made
easy
by simply
plugging
them together.
Impedence matching
is no
Ionger
a
problem
with
transformerless
balanced
inputs.
BIAMP'S
MR/140
has been designed
with
the ability of
an 0p-
Amp to
amplify
a different.ial
input
voltage while
rejecting
any
common
mode voltages.
The
differential
voltage is
applied
to both
the inverting and
non-i.nverting
inputs
of the
0p-
Arp, then
amplified
and coupled
to the next stage.
This
aI-
lows
the stage
to reject any common
mode voltages
present
at
the
input of
the stage.
Common mode
voLtages
would include
radio
frequency
interferenee and hum,
usually
picked up by
patch
cords
interfacing
other
audio components
of the system.
2ComrL
INTERFACING
TRANSFORMERLESS OUTPUT TO
TRANSFORMER
BALANCED LINES
The output
of the BIAMP
l,lR/14O
can drive
any
line transformer
600 ohms or
up. Beeause of the high
output
capability of
the MR/140,
(+?6.5
dBM
@
600 ohms balanced),
most line
transformers will saturate
before the
output
will
clip.
Therefore, note t,he capability of
your
transformers
for
setting
your
maximum
line levels.
It
is
permissable
to
drive
more
than one transformer as long
as the impedence
or
load does
not
go
below 600 ohms.
TACl(
CNBLE
TRANs.
I
:18Oo
AnP
SPECIFICATIONS:
Total
Harmonic Distortion
i.
Relow.019(
drysignal
,
SIew Rate
13 vo-lts
per
mi cro
second dry
si
gnal
Siqnal
to
Noise Ratio
Unity
tlain
85
dB from 0 dB
(zn-1
00KHz
)
65
dB
from 0
dB
with blend
control ar maximum reverb,
all"
EQ
controls
set
at 50,6
Input Impedence
1
0K
minimum
0utput
lrnpedence Unbalanced
1
n0
ohms
Balanced
2Ol
ohrns
l,4aximum
0utput Level
+26d8
Decay Time
1
.2
seconds
Di mensi ons
17t" lJ x 19" lnl x
9l'rtt
D
LIMITED
WARRANTY
BIAMP SYSTEMS,
INC.
warrants to the original
consumer
purchaser
of
each
BIAMP
product
that the
unit
is
free from defects
in materials
and
workmanship.
This
express
warranty
commences
on
the date
of
purchase
from an authorized
BIAMP
dealer and
extends for one
year.
Completion
and
return
of the
warranty
registration
card
enclosed
with
each unit within ten days of the date of
purehase
is
a condition
precedent
to coverage and
performance
under this express
warranty.
EXCLUSIONS
AND
LIMITATIONS: This
warranty
will be V0IDED if
the serial
number
has been
removed
or
defaced, or if
the
unit has been subjected to abuse,
alterations, attempted
repair by any
person
not authorized by warrantor to
make
repairs,
accident, or instrallation
contrary
to the warrantorrs instructions.
Cosmetic
blemishes, such as
handles, feet, and knobs are not warranted. A11
implied
warranties,
ineluding the wamanty of MERCHANTABLILITY are limited
to
the
duration of this
express
warranty,
and, if the registration card in not
promptly
returned,
the implied warranties
are limited to the duration of the
express
wamanty
if it
had
been
effective.
In
no
event
will BIAMP SYSTEMS, INC. be
responsible
for incidental or consequential
damages, except for injury
to the
person.
HOW T0
OBTAIN REMEDY: Carefull
pack your
BIAMP
product
and return it
to
one
of
the
BIAMP
Authorized Service Centers listed below, or
write the BIAMP
Customer
Service Department at the
address
below
for
instructions
on
how
to
return
your
unit to
the factory. Pack a letter
with
the unit explaining the
nature
of,
the
problem
and
giving
your
name and address.
You are responsible
for
freight and insurance
charges to
the Authorized Service
Center
or the faetory.
WHAT BIAMP
WILL D0: BIAMP will
repair or,
at
its option,
replace
each unit
covered
by this warranty, Units
sent
to
the
factory will be
returned to
the owner
freight
collect.
Units brought
to Authorized Service
Centers will
be
held for
piekup
by
the
owner
for a
period
of
time
established by the individual
Authorized
Service Center,
or, at
the
ownerrs
option,
returned to the owner
freight collect.
This
warranty
gives
you
specifie
legal
rights, and
you
may
also
have other
rights
which
vary
from state to state.
For
instance,
some states
do not
allow
limitations
on
how long
an
implied
warranty
1asts, or
the exclusion or
limitation
of
incidental
or
consequential
damages, so
the
above
limitations or
excLusions
may
not
apply
to
you.
BIAMP
CUSTOMER
SERVICE
DEPART}4ENT
BIAMP
SYSTEMS,
INC.
l]000
sw
rlth
Beaverton,
OR
97005
P.
O,
Box
7 28
Beaverton,
OR
97
0l
5
10
/
