congratulations...
on your purchase of a Pyramid Crystal Series
amplifier. This amplifier extends the Pyramid
tradition into a totally new series of amps, designed
from the ground up to deliver the power,
performance and flexibility the modern car audio
enthusiast demands.
When you check the list of features offered by the
PB481X, PB681X, PB781X, PB881X, PB1281X,and
PB1881X, you’ll know you made the right choice
with a Pyramid Power amplifier.
table of contents
1
mounting and installation
25
protection circuitry and troubleshooting
26
19
20
22
23-24
21
speaker connections
PB681X/PB881X/PB1881X
speaker connections
PB481X/PB781X/PB1281X
high level mono input connections
PB681X/PB881X/PB1881X
mono input connections
PB681X/PB881X/PB1881X
high level input connections
PB681X/PB881X/PB1881X
electrical connections
PB481X/PB781X/PB1281X
14
PB681X/PB881X/PB1881X
15
stereo input connections
PB481X/PB781X/PB1281X
16
2/4 channel input connections
PB681X/PB881X/PB1881X
18
mono input connections
PB481X/PB781X/PB1281X
17
features and specifications
PB481X
4-5
PB781X
6-7
PB1281X
8-9
PB681X/PB881X
10-11
general features
2-3
precautions
27
PB1881X
12-13
general features
2
· 300 Watts x 2 Output
· 600 Watts x 1 Bridged Output
· Variable Hi/Lo Electronic Crossover
Network
· Variable Bass Boost (0 - +18 dB @ 60Hz)
· Variable Input Level (Gain) Control
· Remote Turn On/Off
· Gold Plated RCA Inputs
· High Level MOLEX Input
· Power ON LED Indicator
· LED Protection Indicator
· S/N Ratio: > 95 dB
· THD: <0.04%
· Thermal Protection
· Overload Protection
· Short Circuit Protection
· Anti-Thump Turn-On
PB4
81
X
High Performance 600 Watt 2 Channel
Bridgeable MOSFET Amplifier
· 500 Watts x 2 Output
· 1000 Watts x 1 Bridged Output
· Variable Hi/Lo Electronic Crossover
Network
· Variable Bass Boost (0 - +18 dB @ 60Hz)
· Variable Input Level (Gain) Control
· Remote Turn On/Off
· Gold Plated RCA Inputs
· High Level MOLEX Input
· Power ON LED Indicator
· LED Protection Indicator
· S/N Ratio: > 95 dB
· THD: <0.04%
· Thermal Protection
· Overload Protection
· Short Circuit Protection
· Anti-Thump Turn-On
PB
781
X
High Performance
10
00 Watt 2 Channel
Bridgeable MOSFET Amplifier
· 800 Watts x 2 Output
· 1600 Watts x 1 Bridged Output
· Variable Hi/Lo Electronic Crossover
Network
· Variable Bass Boost (0 - +18 dB @ 60Hz)
· Variable Input Level (Gain) Control
· Remote Turn On/Off
· Gold Plated RCA Inputs
· High Level MOLEX Input
· Power ON LED Indicator
· LED Protection Indicator
· Remote Bass Boost
· S/N Ratio: > 95 dB
· THD: <0.04%
· Thermal Protection
· Overload Protection
· Short Circuit Protection
· Anti-Thump Turn-On
PB
1281
X
High Performance 1
6
00 Watt 2 Channel
Bridgeable MOSFET Amplifier
general features
3
· 300 Watts x 4 Output
· 600W x 2 Bridged Output (300W x 2 + 600W x 1)
· Dual Variable Hi/Lo Electronic Crossover Network
· Dual Variable Bass Boost (0 - +18 dB @ 60Hz)
· Variable Input Level (Gain) Control
· Remote Turn On/Off
· Gold Plated RCA Inputs
· High Level MOLEX Inputs
· Power ON LED Indicator
· LED Protection Indicator
· S/N Ratio: > 95 dB
· THD: <0.04%
· Thermal Protection
· Overload Protection
· Short Circuit Protection
· Anti-Thump Turn-On
· Tri-Mode Configurable
PB881X
High Performance 1200 Watt 4 Channel
Bridgeable MOSFET Amplifier
· 450 Watts x 4 Output
· 900W x 2 Bridged Output (450W x 2 + 900W x 1)
· Dual Variable Hi/Lo Electronic Crossover Network
· Dual Variable Bass Boost (0 - +18 dB @ 60Hz)
· Variable Input Level (Gain) Control
· Remote Turn On/Off
· Gold Plated RCA Inputs
· High Level MOLEX Inputs
· Power ON LED Indicator
· LED Protection Indicator
· Remote Bass Boost
· S/N Ratio: > 95 dB
· THD: <0.04%
· Thermal Protection
· Overload Protection
· Short Circuit Protection
· Anti-Thump Turn-On
· Tri-Mode Configurable
PB1881X
High Performance 1800 Watt 4 Channel
Bridgeable MOSFET Amplifier
· 250 Watts x 4 Output
· 500W x 2 Bridged Output (250W x 2 + 500W x 1)
· Dual Variable Hi/Lo Electronic Crossover Network
· Dual Variable Bass Boost (0 - +18 dB @ 60Hz)
· Variable Input Level (Gain) Control
· Remote Turn On/Off
· Gold Plated RCA Inputs
· High Level MOLEX Inputs
· Power ON LED Indicator
· LED Protection Indicator
· S/N Ratio: > 95 dB
· THD: <0.04%
· Thermal Protection
· Overload Protection
· Short Circuit Protection
· Anti-Thump Turn-On
· Tri-Mode Configurable
PB681X
High Performance 1000 Watt 4 Channel
Bridgeable MOSFET Amplifier
high level inputs
input level control
crossover mode selector
protection LED
low pass frequency control
bass boost level
low level inputs
power LED
high pass frequency control
speaker connections
power terminals
power fuse
4
pb481X
features and controls
2 ch amp PB481X
frequency response
power supply voltage
output power @ 14.4v DC, 1KHz
RMS Power @ 4 Ohms
RMS Power @ 2 Ohms
Maximum Power Output
input sensitivity
low level inputs
high level inputs
40 Watts x 2
60 Watts x 2
300 Watts x 2
15 Hz-30 KHz
250mV
2.5V
14.4V DC Neg. Ground (10.5-16V)
crossover mode selector
input level control
low pass frequency control
high pass frequency control
bass boost level control
low level inputs
high level inputs
power LED
protection LED
power fuse
power terminals
speaker connections
when used with normal, full range systems, set this switch to “FULL.” If
you wish to use the internal crossover to power a driver of specific frequency
range, use the “LOWPASS” or “HIGHPASS” settings.
use this control to match the outputs of your head unit to the amplifier.
Starting with your head unit set at about the 2 o’clock position, increase
the amp level control until distortion begins to occur, and reduce slightly
from this point.
when the crossover selector switch is in “low pass” mode, this control
sets the upper frequency limit for audio program sent to the speakers.
when the crossover selector switch is in “high pass” mode, this control
sets the lower frequency limit for audio program sent to the speakers.
this control permits adjustment of the bass level up to an increase of
approximately 18 dB.
this amp features gold-plated RCA input jacks for high impedance input.
Use these with car stereo output which uses RCA-type connector cables.
if your car stereo lacks RCA-type output jacks, you may connect speaker
output leads to these input connectors.
this indicator is illuminated when power is applied.
this indicator is illuminated when built-in protection circuitry is activated.
the fuse protects the amplifier and your car’s electrical system from short
circuit conditions.
use these connectors to deliver power, ground and remote turn-on control
to the amplifier.
these terminals are 14K gold plated to guarantee high conductivity and
minimum signal loss.
maximum current draw
dimensions (W x H x L)
mm
inches
2-4 Ohms
15A
4-8 Ohms
input impedance
low level inputs
high level inputs
10K Ohms
100 Ohms
matching speaker impedance
stereo mode
bridged mode
276 x 60 x 209
10.9 x 2.4 x 8.25
5
features and specifications
2 ch amp PB
481
X
high level inputs
input level control
crossover mode selector
protection LED
low pass frequency control
bass boost level
low level inputs
power LED
high pass frequency control
speaker connections
power terminals
power fuse
6
pb781X
features and controls
2 ch amp PB781X
7
features and specifications
2 ch amp PB781X
crossover mode selector
input level control
low pass frequency control
high pass frequency control
bass boost level control
low level inputs
high level inputs
power LED
protection LED
power fuse
power terminals
speaker connections
when used with normal, full range systems, set this switch to “FULL.” If
you wish to use the internal crossover to power a driver of specific frequency
range, use the “LOWPASS” or “HIGHPASS” settings.
use this control to match the outputs of your head unit to the amplifier.
Starting with your head unit set at about the 2 o’clock position, increase
the amp level control until distortion begins to occur, and reduce slightly
from this point.
when the crossover selector switch is in “low pass” mode, this control
sets the upper frequency limit for audio program sent to the speakers.
when the crossover selector switch is in “high pass” mode, this control
sets the lower frequency limit for audio program sent to the speakers.
this control permits adjustment of the bass level up to an increase of
approximately 18 dB.
this amp features gold-plated RCA input jacks for high impedance input.
Use these with car stereo output which uses RCA-type connector cables.
if your car stereo lacks RCA-type output jacks, you may connect speaker
output leads to these input connectors.
this indicator is illuminated when power is applied.
this indicator is illuminated when built-in protection circuitry is activated.
the fuse protects the amplifier and your car’s electrical system from short
circuit conditions.
use these connectors to deliver power, ground and remote turn-on control
to the amplifier.
these terminals are 14K gold plated to guarantee high conductivity and
minimum signal loss.
frequency response
power supply voltage
output power @ 14.4v DC, 1KHz
RMS Power @ 4 Ohms
RMS Power @ 2 Ohms
Maximum Power Output
input sensitivity
low level inputs
high level inputs
50 Watts x 2
75 Watts x 2
500 Watts x 2
15 Hz-30 KHz
250mV
2.5V
14.4V DC Neg. Ground (10.5-16V)
maximum current draw
dimensions (W x H x L)
mm
inches
2-4 Ohms
4-8 Ohms
input impedance
low level inputs
high level inputs
10K Ohms
100 Ohms
matching speaker impedance
stereo mode
bridged mode
15A
276 x 60 x 2
79
10.9 x 2.4 x 11
speaker connections
power terminals
power fuse
Remote Bass Boost
8
pb1281X
features and controls
2 ch amp PB1281X
high level inputs
input level control
crossover mode selector
protection LED
low pass frequency control
bass boost level
low level inputs
power LED
high pass frequency control
frequency response
power supply voltage
output power @ 14.4v DC, 1KHz
RMS Power @ 4 Ohms
RMS Power @ 2 Ohms
Maximum Power Output
input sensitivity
low level inputs
high level inputs
75 Watts x 2
120 Watts x 2
800 Watts x 2
15 Hz-30 KHz
250mV
2.5V
14.4V DC Neg. Ground (10.5-16V)
maximum current draw
dimensions (W x H x L)
mm
inches
2-4 Ohms
4-8 Ohms
input impedance
low level inputs
high level inputs
10K Ohms
100 Ohms
matching speaker impedance
stereo mode
bridged mode
20A
276 x 60 x 394
10.9 x 2.4x 15.5
crossover mode selector
input level control
low pass frequency control
high pass frequency control
bass boost level control
low level inputs
high level inputs
power LED
protection LED
power fuse
power terminals
speaker connections
when used with normal, full range systems, set this switch to “FULL.” If
you wish to use the internal crossover to power a driver of specific frequency
range, use the “LOWPASS” or “HIGHPASS” settings.
use this control to match the outputs of your head unit to the amplifier.
Starting with your head unit set at about the 2 o’clock position, increase
the amp level control until distortion begins to occur, and reduce slightly
from this point.
when the crossover selector switch is in “low pass” mode, this control
sets the upper frequency limit for audio program sent to the speakers.
when the crossover selector switch is in “high pass” mode, this control
sets the lower frequency limit for audio program sent to the speakers.
this control permits adjustment of the bass level up to an increase of
approximately 18 dB.
this amp features gold-plated RCA input jacks for high impedance input.
Use these with car stereo output which uses RCA-type connector cables.
if your car stereo lacks RCA-type output jacks, you may connect speaker
output leads to these input connectors.
this indicator is illuminated when power is applied.
this indicator is illuminated when built-in protection circuitry is activated.
the fuse protects the amplifier and your car’s electrical system from short
circuit conditions.
use these connectors to deliver power, ground and remote turn-on control
to the amplifier.
these terminals are 14K gold plated to guarantee high conductivity and
minimum signal loss.
Remote Bass Boost Plug in the Remote Bass Boost Control wire in here.
9
features and specifications
2 ch amp PB1281X
10
pb681X
pb881X
features and controls
4 ch amp PB681X • PB881X
protection LED
power LED
ch 3/4 low level inputs
ch 3/4 high level inputs
ch 3/4 bass boost level control
ch 3/4 low pass frequency control
ch 3/4 high pass frequency control
ch 3/4 crossover mode selector switch
ch 3/4 input level control
ch 1/2 low level inputs
ch 1/2 high level inputs
ch 1/2 input level control
ch 1/2 bass boost level control
ch 1/2 low pass frequency control
ch 1/2 high pass frequency control
ch 1/2 crossover mode selector switch
speaker connections
power terminals
power fuse
PB
681X
frequency response
power supply voltage
output power @ 14.4v DC, 1KHz
RMS Power @ 4 Ohms
RMS Power @ 2 Ohms
Maximum Power Output
input sensitivity
low level inputs
high level inputs
35 Watts x 4
55 Watts x 4
250 Watts x 4
15 Hz-30 KHz
250mV
2.5V
14.4V DC Neg. Ground (10.5-16V)
PB
881X
50 Watts x 4
60 Watts x 4
300 Watts x 4
maximum current draw
dimensions (W x H x L)
mm
inches
2-4 Ohms
4-8 Ohms
matching speaker impedance
stereo mode
bridged mode
input impedance
low level inputs
high level inputs
10K Ohms
100 Ohms
20 A 30 A
276 x 60 x 305
10.9 x 2.4 x 12
276 x 60 x 394
10.9 x 2.4 x 15.5
dual crossover mode selectors
dual input level controls
dual low pass frequency controls
dual high pass frequency controls
dual bass boost level controls
low level inputs
high level inputs
power LED
protection LED
power fuse
power terminals
speaker connections
when used with normal, full range systems, set these switches to “FULL.”
If you wish to use the internal crossovers to power a driver of specific
frequency range, use the “LOWPASS” or “HIGHPASS” settings.
use these controls to match the outputs of your head unit to the amplifier.
Starting with your head unit set at about the 2 o’clock position, increase
the amp level controls until distortion begins to occur, and reduce slightly
from this point.
when one or both of the crossover selector switches is in “low pass”
mode, one can set the upper frequency limit for audio program sent to
the speakers.
when the one or both of crossover selector switch is in “high pass” mode,
one can set the lower frequency limit for audio program sent to the
speakers.
this control permits adjustment of the bass level up to an increase of
approximately 18 dB in either or both pairs of channels.
this amp features gold-plated RCA input jacks for high impedance input.
Use these with car stereo output which uses RCA-type connector cables.
if your car stereo lacks RCA-type output jacks, you may connect speaker
output leads to these input connectors.
this indicator is illuminated when power is applied.
this indicator is illuminated when built-in protection circuitry is activated.
the fuse protects the amplifier and your car’s electrical system from short
circuit conditions.
use these connectors to deliver power, ground and remote turn-on control
to the amplifier.
these terminals are 14K gold plated to guarantee high conductivity and
minimum signal loss.
11
features and specifications
4 ch amp PB681X • PB881X
12
pb1881X
features and controls
4 ch amp PB
1881
X
protection LED
power LED
speaker connections
power terminals
power fuse
ch 1/2 low level inputs
ch 1/2 high level inputs
ch 3/4 low level inputs
ch 3/4 high level inputs
Remote Bass Boost
ch 1/2 input level control
ch 1/2 bass boost level control
ch 1/2 low pass frequency control
ch 1/2 high pass frequency control
ch 1/2 crossover mode selector switch
ch 3/4 bass boost level control
ch 3/4 low pass frequency control
ch 3/4 high pass frequency control
ch 3/4 crossover mode selector switch
ch 3/4 input level control
dual crossover mode selectors
dual input level controls
dual low pass frequency controls
dual high pass frequency controls
dual bass boost level controls
low level inputs
high level inputs
power LED
protection LED
power fuse
power terminals
speaker connections
when used with normal, full range systems, set these switches to “FULL.”
If you wish to use the internal crossovers to power a driver of specific
frequency range, use the “LOWPASS” or “HIGHPASS” settings.
use these controls to match the outputs of your head unit to the amplifier.
Starting with your head unit set at about the 2 o’clock position, increase
the amp level controls until distortion begins to occur, and reduce slightly
from this point.
when one or both of the crossover selector switches is in “low pass”
mode, one can set the upper frequency limit for audio program sent to
the speakers.
when the one or both of crossover selector switch is in “high pass” mode,
one can set the lower frequency limit for audio program sent to the
speakers.
this control permits adjustment of the bass level up to an increase of
approximately 18 dB in either or both pairs of channels.
this amp features gold-plated RCA input jacks for high impedance input.
Use these with car stereo output which uses RCA-type connector cables.
if your car stereo lacks RCA-type output jacks, you may connect speaker
output leads to these input connectors.
this indicator is illuminated when power is applied.
this indicator is illuminated when built-in protection circuitry is activated.
the fuse protects the amplifier and your car’s electrical system from short
circuit conditions.
use these connectors to deliver power, ground and remote turn-on control
to the amplifier.
these terminals are 14K gold plated to guarantee high conductivity and
minimum signal loss.
PB
1881X
frequency response
power supply voltage
output power @ 14.4v DC, 1KHz
RMS Power @ 4 Ohms
RMS Power @ 2 Ohms
Maximum Power Output
input sensitivity
low level inputs
high level inputs
75 Watts x 4
120 Watts x 4
450 Watts x 4
15 Hz-30 KHz
250mV
2.5V
14.4V DC Neg. Ground (10.5-16V)
maximum current draw
dimensions (W x H x L)
mm
inches
2-4 Ohms
4-8 Ohms
matching speaker impedance
stereo mode
bridged mode
input impedance
low level inputs
high level inputs
10K Ohms
100 Ohms
40 A
276 x 60 x 432
10.9 x 2.4 x 17
13
features and specifications
4 ch amp PB1881X
CH 3/4 Remote Bass Boost Plug in the Remote Bass Boost Control wire in here.
GROUND
+12V BATT
REM
FUSE
L
R
BRIDGED
+
--
+
-
+
to remote turn-on
+12V
head unit
12V battery
14
electrical connections
2 ch amp PB481X • PB781X • PB1281X
pb481X
pb781X
pb1281X
to remote turn-on
+12V
head unit
12V battery
CH3
CH4
GROUND
+12V BATT
REM
BRIDGED
FUSE
BRIDGED
+
--
+
-
+
-
+
-
+
-
+
CH1
CH2
to remote turn-on
+12V
head unit
12V battery
REM
CH3
CH4
GROUND
+12V BATT
BRIDGED
FUSE
BRIDGED
+
--
+
-
+
-
+
-
+
-
+
CH1
CH2
15
electrical connections
4 ch amp PB681X • PB881X • PB1881X
pb681X
pb881X
pb1881X
head unit
L/R Audio
Outputs
from speaker terminals
LL RR
using
high level inputs
head unit
wiring harness
PLEASE NOTE! If using high level
inputs, do not use the low level RCA
inputs at the same time!
16
stereo input connections
2 ch amp PB481X • PB781X • PB1281X
pb481X
pb781X
pb1281X
using
low level inputs
head unit
using low level inputs
PLEASE NOTE! If using high level
inputs, do not use the low level RCA
inputs at the same time!
using high level inputs
To a second amplifier
Y Adaptors
17
mono input connections
2 ch amp PB481X • PB781X • PB1281X
pb481X
pb781X
pb1281X
head unit
wiring harnesswiring harness
To a second amplifier
RRLL
from speaker terminals
4 CH input connections using low level inputs
2 CH input connections using low level inputs
Y adaptors
R
L
FREQ.
CH 3
LOW IN
LEVEL
MIN MAX
CH 4
HPF
+18db
0
35
400
Hz
LPF
80
HPF
2.5k
2.5k
Hz
+18db
0
BASS
BOOST
MIN MAX
FREQ.
CH 1
CH 2
80
Hz
35
400
Hz
LPF
HI IN
CH4 CH3
+
-
-
+
HI IN
CH2 CH1
+
-
-
+
LOW IN
BASS
BOOST
LEVEL
FULL
HPF
LPF
FULL
HPF
LPF
POWER
PROTECT
REMOTE
BASS BOOST(CH3/4)
head unit
L/R REAR
Audio Outputs
L/R FRONT
Audio Outputs
FREQ.
CH 3
LOW IN
LEVEL
MIN MAX
CH 4
HPF
+18db
0
35
400
Hz
LPF
80
HPF
2.5k
2.5k
Hz
+18db
0
BASS
BOOST
MIN MAX
FREQ.
CH 1
CH 2
80
Hz
35
400
Hz
LPF
HI IN
CH4 CH3
+
-
-
+
HI IN
CH2 CH1
+
-
-
+
LOW IN
BASS
BOOST
LEVEL
FULL
HPF
LPF
FULL
HPF
LPF
18
pb681X
pb881X
pb1881X
2/4 channel input connections
4 ch amp PB681X • PB881X • PB1881X
REMOTE
BASS BOOST(CH3/4)
POWER
PROTECT
FREQ.
CH 3
LOW IN
LEVEL
MIN MAX
CH 4
HPF
+18db
0
35
400
Hz
LPF
80
HPF
2.5k
2.5k
Hz
+18db
0
BASS
BOOST
MIN MAX
FREQ.
CH 1
CH 2
80
Hz
35
400
Hz
LPF
HI IN
CH4 CH3
+
-
-
+
HI IN
CH2 CH1
+
-
-
+
LOW IN
BASS
BOOST
LEVEL
FULL
HPF
LPF
FULL
HPF
LPF
POWER
PROTECT
REMOTE
BASS BOOST(CH3/4)
4 CH floating ground connections
from speaker terminals
L R FRONTLRREAR
ORANGE
ORANGE
ORANGE
ORANGE
BLACK
BLACK
BLACK
BLACK
PLEASE NOTE! If using high level inputs,
do not use the low level RCA inputs at
the same time!
CH 1/2
4 CH harness wiring for common ground connections
from speaker terminals
L R FRONTRLREAR
ORANGE
ORANGE
ORANGE
ORANGE
BLACK
BLACK
BLACK
BLACK
CH 3/4
1
9
pb681X
pb8
81
X
pb1
881
X
high level
input connections
4 ch amp PB681X • PB881X • PB1881X
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