Page 1
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.
Page 2
table of contents
general features
features and specifications
PB481X
PB781X
PB1281X
PB681X/PB881X
PB1881X
electrical connections
PB481X/PB781X/PB1281X
PB681X/PB881X/PB1881X
stereo input connections
PB481X/PB781X/PB1281X
mono input connections
PB481X/PB781X/PB1281X
2/4 channel input connections
PB681X/PB881X/PB1881X
2-3
4-5
6-7
8-9
10-11
12-13
14
15
16
17
18
high level input connections
PB681X/PB881X/PB1881X
mono input connections
PB681X/PB881X/PB1881X
high level mono input connections
PB681X/PB881X/PB1881X
speaker connections
PB481X/PB781X/PB1281X
speaker connections
PB681X/PB881X/PB1881X
mounting and installation
protection circuitry and troubleshooting
precautions
19
20
21
22
1
23-24
25
26
27
Page 3
general features
PB4
High Performance 600 Watt 2 Channel
Bridgeable MOSFET Amplifier
· 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
81
X
PB
High Performance 1000 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
781
X
PB
High Performance 1600 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
1281
X
2
Page 4
general features
PB681X
High Performance 1000 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
PB881X
High Performance 1200 Watt 4 Channel
Bridgeable MOSFET Amplifier
· 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
PB1881X
High Performance 1800 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
3
Page 5
features and controls
2 ch amp PB481X
pb481X
power LED
protection LED
high pass frequency control
low pass frequency control
bass boost level
crossover mode selector
speaker connections
low level inputs
high level inputs
input level control
power terminals
power fuse
4
Page 6
features and specifications
2 ch amp PB
481
X
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.
output power @ 14.4v DC, 1KHz
RMS Power @ 4 Ohms
RMS Power @ 2 Ohms
Maximum Power Output
frequency response
input impedance
low level inputs
high level inputs
input sensitivity
low level inputs
high level inputs
power supply voltage
matching speaker impedance
stereo mode
bridged mode
maximum current draw
dimensions (W x H x L)
mm
inches
40 Watts x 2
60 Watts x 2
300 Watts x 2
15 Hz-30 KHz
10K Ohms
100 Ohms
250mV
2.5V
14.4V DC Neg. Ground (10.5-16V)
2-4 Ohms
4-8 Ohms
15A
276 x 60 x 209
10.9 x 2.4 x 8.25
5
Page 7
features and controls
2 ch amp PB781X
pb781X
power LED
protection LED
high pass frequency control
low pass frequency control
bass boost level
crossover mode selector
speaker connections
low level inputs
high level inputs
input level control
power terminals
power fuse
6
Page 8
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.
output power @ 14.4v DC, 1KHz
RMS Power @ 4 Ohms
RMS Power @ 2 Ohms
Maximum Power Output
frequency response
input impedance
low level inputs
high level inputs
input sensitivity
low level inputs
high level inputs
power supply voltage
matching speaker impedance
stereo mode
bridged mode
maximum current draw
dimensions (W x H x L)
mm
inches
50 Watts x 2
75 Watts x 2
500 Watts x 2
15 Hz-30 KHz
10K Ohms
100 Ohms
250mV
2.5V
14.4V DC Neg. Ground (10.5-16V)
2-4 Ohms
4-8 Ohms
15A
276 x 60 x 2
79
10.9 x 2.4 x 11
7
Page 9
features and controls
2 ch amp PB1281X
pb1281X
power LED
protection LED
Remote Bass Boost
high pass frequency control
low pass frequency control
bass boost level
crossover mode selector
speaker connections
low level inputs
high level inputs
input level control
power terminals
power fuse
8
Page 10
features and specifications
2 ch amp PB1281X
crossover mode selector
input level control
low pass frequency control
high pass frequency control
Remote Bass Boost Plug in the Remote Bass Boost Control wire in here.
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.
output power @ 14.4v DC, 1KHz
RMS Power @ 4 Ohms
RMS Power @ 2 Ohms
Maximum Power Output
frequency response
input impedance
low level inputs
high level inputs
input sensitivity
low level inputs
high level inputs
power supply voltage
matching speaker impedance
stereo mode
bridged mode
maximum current draw
dimensions (W x H x L)
mm
inches
75 Watts x 2
120 Watts x 2
800 Watts x 2
15 Hz-30 KHz
10K Ohms
100 Ohms
250mV
2.5V
14.4V DC Neg. Ground (10.5-16V)
2-4 Ohms
4-8 Ohms
20A
276 x 60 x 394
10.9 x 2.4x 15.5
9
Page 11
pb681X
pb881X
power LED
protection LED
ch 3/4 input level control
ch 3/4 high level inputs
features and controls
4 ch amp PB681X • PB881X
ch 1/2 input level control
ch 1/2 high level inputs
ch 3/4 low level inputs
ch 3/4 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
speaker connections
ch 1/2 low level inputs
ch 1/2 crossover mode selector switch
ch 1/2 bass boost level control
ch 1/2 low pass frequency control
ch 1/2 high pass frequency control
power terminals
power fuse
10
Page 12
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
features and specifications
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.
4 ch amp PB681X • PB881X
250mV
2.5V
PB
881X
50 Watts x 4
60 Watts x 4
300 Watts x 4
276 x 60 x 394
10.9 x 2.4 x 15.5
output power @ 14.4v DC, 1KHz
RMS Power @ 4 Ohms
RMS Power @ 2 Ohms
Maximum Power Output
frequency response
input impedance
low level inputs
high level inputs
input sensitivity
low level inputs
high level inputs
power supply voltage
matching speaker impedance
stereo mode
bridged mode
maximum current draw
dimensions (W x H x L)
mm
inches
PB
681X
35 Watts x 4
55 Watts x 4
250 Watts x 4
15 Hz-30 KHz
10K Ohms
100 Ohms
14.4V DC Neg. Ground (10.5-16V)
2-4 Ohms
4-8 Ohms
20 A 30 A
276 x 60 x 305
10.9 x 2.4 x 12
11
Page 13
pb1881X
ch 3/4 input level control
ch 3/4 high level inputs
features and controls
4 ch amp PB
Remote Bass Boost
ch 1/2 input level control
ch 1/2 high level inputs
1881
X
ch 3/4 low level inputs
ch 3/4 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
protection LED
power LED
speaker connections
ch 1/2 low level inputs
ch 1/2 crossover mode selector switch
ch 1/2 bass boost level control
ch 1/2 low pass frequency control
ch 1/2 high pass frequency control
power terminals
power fuse
12
Page 14
features and specifications
dual crossover mode selectors
dual input level controls
dual low pass frequency controls
dual high pass frequency controls
CH 3/4 Remote Bass Boost Plug in the Remote Bass Boost Control wire in here.
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.
4 ch amp PB1881X
output power @ 14.4v DC, 1KHz
RMS Power @ 4 Ohms
RMS Power @ 2 Ohms
Maximum Power Output
frequency response
input impedance
low level inputs
high level inputs
input sensitivity
low level inputs
high level inputs
power supply voltage
matching speaker impedance
stereo mode
bridged mode
maximum current draw
dimensions (W x H x L)
mm
inches
PB
1881X
75 Watts x 4
120 Watts x 4
450 Watts x 4
15 Hz-30 KHz
10K Ohms
100 Ohms
250mV
2.5V
14.4V DC Neg. Ground (10.5-16V)
2-4 Ohms
4-8 Ohms
40 A
276 x 60 x 432
10.9 x 2.4 x 17
13
Page 15
pb481X
pb781X
electrical connections
2 ch amp PB481X • PB781X • PB1281X
pb1281X
+
+
L
BRIDGED
GROUND
REM
+12V BATT
R
+
--
FUSE
14
-
12V battery
head unit
to remote turn-on
+12V
Page 16
electrical connections
4 ch amp PB681X • PB881X • PB1881X
pb681X
pb881X
pb1881X
+
+
CH1
-
BRIDGED
+
+
CH1
-
BRIDGED
CH3
BRIDGED
CH4
+
--
-
CH2
+
+
-
+
-
FUSE
GROUND
REM
+12V BATT
12V battery
15
head unit
GROUND
REM
+12V BATT
to remote turn-on
CH3
CH2
+
+
-
CH4
+
FUSE
--
+12V
+
-
BRIDGED
-
12V battery
head unit
to remote turn-on
+12V
Page 17
pb481X
pb781X
using
stereo input connections
2 ch amp PB481X • PB781X • PB1281X
low level inputs
pb1281X
using
high level inputs
LL RR
from speaker terminals
head unit
L/R Audio
Outputs
head unit
16
PLEASE NOTE! If using high level
inputs, do not use the low level RCA
inputs at the same time!
wiring harness
Page 18
pb481X
pb781X
mono input connections
2 ch amp PB481X • PB781X • PB1281X
using low level inputs
pb1281X
To a second amplifier
To a second amplifier
using high level inputs
head unit
RRLL
from speaker terminals
head unit
17
Y Adaptors
PLEASE NOTE! If using high level
inputs, do not use the low level RCA
inputs at the same time!
wiring harnesswiring harness
Page 19
2/4 channel input connections
4 CH input connections using low level inputs
4 ch amp PB681X • PB881X • PB1881X
pb681X
pb881X
pb1881X
BASS
BOOST
HPF
LPF
35
80
400
0
2.5k
+18db
Hz
Hz
BASS BOOST(CH3/4)
PROTECT
+ - - +
CH4 CH3
HI IN
LOW IN
LEVEL
MIN MAX
FREQ.
HPF
LPF
FULL
CH 4
CH 3
L/R REAR
Audio Outputs
2 CH input connections using low level inputs
BASS
BOOST
HPF
LPF
80
35
400
0
+18db
Hz
Hz
PROTECT
+ - - +
CH4 CH3
HI IN
LOW IN
LEVEL
MIN MAX
FREQ.
HPF
LPF
FULL
CH 4
CH 3
REMOTE
2.5k
REMOTE
BASS BOOST(CH3/4)
POWER
POWER
BASS
BOOST
LPF
HPF
35
400
80
2.5k
Hz
Hz
LEVEL
FREQ.
HPF
LPF
0
+18db
CH 2
+ - - +
LOW IN
CH2 CH1
HI IN
CH 1
L/R FRONT
head unit
MIN MAX
FULL
Audio Outputs
18
BASS
BOOST
LPF
HPF
35
400
2.5k
80
Hz
Hz
LEVEL
FREQ.
HPF
LPF
0
+18db
CH 2
+ - - +
LOW IN
CH2 CH1
HI IN
CH 1
MIN MAX
FULL
R
Y adaptors
L
Page 20
high level
4 CH floating ground connections
input connections
4 ch amp PB681X • PB881X • PB1881X
pb681X
pb881X
pb1
881
X
ORANGE
BLACK
BLACK
ORANGE
PLEASE NOTE! If using high level inputs,
do not use the low level RCA inputs at
the same time!
+ - - +
CH4 CH3
HI IN
LOW IN
POWER
BASS
BOOST
LPF
HPF
35
0
400
2.5k
80
Hz
Hz
LEVEL
FREQ.
HPF
LPF
+18db
CH 2
+ - - +
LOW IN
CH2 CH1
HI IN
CH 1
1
9
MIN MAX
FULL
BASS
BOOST
HPF
LPF
35
80
400
0
2.5k
+18db
Hz
Hz
REMOTE
BASS BOOST(CH3/4)
PROTECT
LEVEL
MIN MAX
FREQ.
HPF
LPF
FULL
CH 4
CH 3
4 CH harness wiring for common ground connections
CH 1/2
ORANGE
BLACK
BLACK
ORANGE
L R FRONTLRREAR
from speaker terminals
ORANGE
BLACK
BLACK
ORANGE
CH 3/4
L R FRONTRLREAR
ORANGE
BLACK
BLACK
ORANGE
from speaker terminals
Page 21
4 CH mono input connections using
mono
input connections
4 ch amp PB681X • PB881X • PB1881X
low level inputs
pb681X
pb881X
pb1
881
X
BASS
FREQ.
BOOST
HPF
LPF
0
FULL
+ - - +
CH4 CH3
HI IN
LOW IN
LEVEL
CH 4
MIN MAX
CH 3
RIGHT FRONT Audio Outputs
RIGHT REAR Audio Outputs
2 CH mono input connections using
BASS
FREQ.
BOOST
HPF
LPF
0
FULL
+ - - +
CH4 CH3
HI IN
LOW IN
LEVEL
CH 4
MIN MAX
CH 3
HPF
LPF
35
80
400
2.5k
+18db
Hz
Hz
REMOTE
BASS BOOST(CH3/4)
PROTECT
POWER
LPF
HPF
35
400
80
2.5k
Hz
Hz
low level inputs
HPF
LPF
35
80
400
2.5k
+18db
Hz
Hz
REMOTE
BASS BOOST(CH3/4)
PROTECT
POWER
LPF
HPF
35
400
2.5k
80
Hz
Hz
BASS
BOOST
BOOST
LEVEL
FREQ.
HPF
LPF
0
+18db
CH 2
+ - - +
LOW IN
CH2 CH1
HI IN
CH 1
MIN MAX
FULL
head unit
LEFT FRONT Audio Outputs
LEFT REAR Audio Outputs
BASS
LEVEL
FREQ.
HPF
LPF
0
+18db
CH 2
+ - - +
LOW IN
CH2 CH1
HI IN
CH 1
MIN MAX
FULL
20
L
Y adaptors
R
Page 22
high level mono
4 ch amp PB681X • PB881X • PB1881X
4 CH floating ground connections
input connections
pb681X
pb881X
pb1881X
PLEASE NOTE! If using high level inputs,
do not use the low level RCA inputs at
the same time!
+ - - +
CH4 CH3
HI IN
ORANGE
BLACK
BLACK
ORANGE
LOW IN
POWER
BASS
BOOST
LPF
HPF
35
400
2.5k
80
Hz
Hz
LEVEL
FREQ.
HPF
LPF
0
+18db
CH 2
+ - - +
MIN MAX
FULL
CH2 CH1
HI IN
CH 1
4 CH harness wiring
LOW IN
for common ground connections
BASS
LEVEL
MIN MAX
FREQ.
HPF
LPF
FULL
CH 4
CH 3
BOOST
HPF
LPF
35
80
400
0
2.5k
+18db
Hz
Hz
REMOTE
BASS BOOST(CH3/4)
PROTECT
CH 3/4
21
CH 1/2
RL
ORANGE
from speaker terminals
BLACK
BLACK
ORANGE
ORANGE
BLACK
BLACK
ORANGE
RL
ORANGE
BLACK
BLACK
ORANGE
from speaker terminals
Page 23
pb481X
pb781X
pb1281X
speaker connections
2 ch amp PB481X • PB781X • PB1281X
Stereo Output Mode
22
Bridged Mono Output Mode
LEFT speaker
RIGHT speaker
MINIMUM
SPEAKER
IMPEDANCE
4 OHMS!
speaker
Page 24
pb681X
4 CH Output Mode
speaker connections
4 ch amp PB681X • PB881X • PB1881X
REM
CH1
+
+
-
CH3
CH2
+
-
CH4
+
FUSE
--
GROUND
+12V BATT
pb881X
pb1881X
+
BRIDGED
LR
FRONT speakers
RL
Bridged Dual Mono Output Mode
CH1
CH2
+
+
-
+
BRIDGED
speakers
LR
+
-
BRIDGED
-
23
REAR speakers
REM
CH3
CH4
+
+
-
+
-
BRIDGED
FUSE
--
GROUND
+12V BATT
MINIMUM
SPEAKER
-
IMPEDANCE
4 OHMS!
Page 25
pb681X
pb881X
pb1881X
speaker connections
4 ch amp PB681X • PB881X • PB1881X
2 CH Bridged Output Mode with Subwoofer Output
CH1
+
+
BRIDGED
SUBWOOFER
GROUND
REM
+12V BATT
24
CH2
+
-
CH3
+
-
+
-
BRIDGED
CH4
+
FUSE
--
-
MINIMUM
SPEAKER
R
L
SPEAKERS
IMPEDANCE
4 OHMS!
Page 26
mounting and installation
mounting
wiring tips
fuses
Your new Pyramid Crystal Series amplifier comes complete with all required mounting hardware. When determining a suitable location in your vehicle for the amp, please
remember that it is a high-power electronic device capable of generating high heat.
For this reason, always choose a location in your vehicle which has low vibration, adequate ventilation, a minimum of dust, and no moisture. Be sure to
mount the amp in such a manner as to allow reasonable airflow over the cooling fins.
Mark the location for the mounting screw holes by positioning the amp where you wish to install it and use a scribe (or one of the mounting screws) inserted in each
of the mounting holes to mark the mounting surface. If the mounting surface is carpeted, measure the hole centers and mark with a felt tip pen.
Before attempting to drill the mounting holes, take note of any wires, lines or other devices in your vehicle which may be located behind the mounting
surface! Then drill pilot holes in the mounting surface for the mounting screws and insert them. Tighten the screws securely.
When making electrical connections to your amplifier, please observe the
following:
Use at least 8 gauge wire for power and ground connections.
Wire the amplifier directly to the car battery.
For the ground connection, use the shortest possible wire to a good chassis ground point.
Wire the Remote connection to the auto start lead of your head unit, equalizer or power antenna.
About power fuses:
Pyramid Crystal Series amplifiers feature built-in fuse systems. These fuses protect both the
amplifier and the electrical system in your vehicle from fault conditions. If you ever need to
replace the fuse in your Pyramid Crystal Series amp, use a fuse of exactly the same type and
rating. A different type or rating of fuse may result in damage or fire.
25
Page 27
protection
circuitry
The built-in protection circuitry in the Pyramid
Crystal amplifiers will disable the amplifier if it
senses an input overload, a speaker short circuit,
or extreme temperature conditions.
troubleshooting
No output.
Confirm that all terminal strip connections are secure and tight.
Check both in-line and built-in fuses. Both the +12V and the Remote terminals must have +12v referenced to chassis
ground.
When the protection circuit is activated by any of
these conditions, the Protection LED will be
illuminated.
If this occurs, carefully inspect the system to
determine the source of the problem.
• If the shutdown was a result of a thermal overload
condition, allow the amplifier to cool down before
attempting to restart it.
• If the shutdown was a result of an input overload,
or speaker short circuit, be sure to correct the
condition before restarting.
The amplifier can be restarted by turning the remote
power OFF and then ON again.
Confirm that the audio signal source (car radio, equalizer, etc.) is connected and is supplying output signal. To
check if the amp is supplying signal, unplug the cables from the signal source (but leave them plugged into the
amp). Briefly tap the center pin of each of the disconnected RCA plugs with your finger. This should produce a noise
(feedback) in your speakers.
Only one channel works.
Confirm that all terminal strip connections are secure and tight.
Check the Balance control on the head unit (or other source) to verify that it is set to its midpoint.
If you are using the Low Level RCA input, reverse the input plugs at the amplifier (i.e., switch the L with the R). If
the channels which is silent switches to the other side, the problem is either in the head unit/other source or the
connecting cables.
Weak output.
Readjust the Input Level Control(s) to better suit the input signal.
Noise in the audio.
If the noise is a “whine” whose pitch follows the engine speed, confirm that the amplifier and any other signal
sources (head unit, etc.) are properly grounded.
If the noise is a “clicking” or “popping” noise whose rate follows the engine speed, this usually means that the
vehicle is equipped with resistor spark plugs and wires, or that the ignition is in need of service.
Check the rounting of the speaker and input wires to make sure they are not adjacent to wires which interconnect
lights and other accessories.
If the above steps fail to improve or clear noise interference, the system should be checked by a professional mobile
audio installer.
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Page 28
precautions notes
Do not operate the amplifier when it is unmounted.
Attach all audio system components securely within
the automobile to prevent damage, especially in an
accident.
Do not mount this amplifier so that the wire
connections are unprotected, or in a pinched
condition, or likely to be damaged by nearby objects.
Before making or breaking power connections in
your system, disconnect the vehicle battery. Confirm
that your head unit or other equipment is turned off
while connecting the input jacks and speaker
terminals.
If you need to replace the power fuse, do so only
with a fuse identical to that supplied with the amplifier.
Using a fuse of a different type or rating may result
in damage that isn’t covered in the manufacturer’s
warranty.
27
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