Pyramid Car Audio Car Amplifier PB1281X User Guide

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.  
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general features  
PB481X PB781X PB1281  
· 500 Watts x 2 Output  
X
High Performance 600 Watt 2 Channel  
Bridgeable MOSFET Amplifier  
High Performance 1000 Watt 2 Channel  
Bridgeable MOSFET Amplifier  
High Performance 1600 Watt 2 Channel  
Bridgeable MOSFET Amplifier  
· 800 Watts x 2 Output  
· 300 Watts x 2 Output  
· 600 Watts x 1 Bridged Output  
· Variable Hi/Lo Electronic Crossover  
Network  
· 1000 Watts x 1 Bridged Output  
· Variable Hi/Lo Electronic Crossover  
Network  
· 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  
· Variable Bass Boost (0 - +18 dB @ 60Hz)  
· Variable Input Level (Gain) Control  
· Remote Turn On/Off  
· Variable Bass Boost (0 - +18 dB @ 60Hz)  
· Variable Input Level (Gain) Control  
· Remote Turn On/Off  
2
· Gold Plated RCA Inputs  
· High Level MOLEX Input  
· Power ON LED Indicator  
· LED Protection Indicator  
· S/N Ratio: > 95 dB  
· Gold Plated RCA Inputs  
· High Level MOLEX Input  
· Power ON LED Indicator  
· LED Protection Indicator  
· S/N Ratio: > 95 dB  
· Gold Plated RCA Inputs  
· High Level MOLEX Input  
· Power ON LED Indicator  
· LED Protection Indicator  
· Remote Bass Boost  
· THD: <0.04%  
· THD: <0.04%  
· S/N Ratio: > 95 dB  
· Thermal Protection  
· Thermal Protection  
· THD: <0.04%  
· Overload Protection  
· Overload Protection  
· Thermal Protection  
· Short Circuit Protection  
· Anti-Thump Turn-On  
· Short Circuit Protection  
· Anti-Thump Turn-On  
· Overload Protection  
· Short Circuit Protection  
· Anti-Thump Turn-On  
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general features  
PB681X PB881X PB1881X  
· 250 Watts x 4 Output  
High Performance 1000 Watt 4 Channel  
Bridgeable MOSFET Amplifier  
High Performance 1200 Watt 4 Channel  
Bridgeable MOSFET Amplifier  
High Performance 1800 Watt 4 Channel  
Bridgeable MOSFET Amplifier  
· 300 Watts x 4 Output  
· 450 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  
· 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  
· 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  
3
· Gold Plated RCA Inputs  
· Gold Plated RCA Inputs  
· Gold Plated RCA Inputs  
· High Level MOLEX Inputs  
· Power ON LED Indicator  
· LED Protection Indicator  
· S/N Ratio: > 95 dB  
· High Level MOLEX Inputs  
· Power ON LED Indicator  
· LED Protection Indicator  
· S/N Ratio: > 95 dB  
· High Level MOLEX Inputs  
· Power ON LED Indicator  
· LED Protection Indicator  
· Remote Bass Boost  
· THD: <0.04%  
· THD: <0.04%  
· S/N Ratio: > 95 dB  
· Thermal Protection  
· Thermal Protection  
· THD: <0.04%  
· Overload Protection  
· Overload Protection  
· Thermal Protection  
· Short Circuit Protection  
· Short Circuit Protection  
· Overload Protection  
· Anti-Thump Turn-On  
· Anti-Thump Turn-On  
· Short Circuit Protection  
· Tri-Mode Configurable  
· Tri-Mode Configurable  
· Anti-Thump Turn-On  
· Tri-Mode Configurable  
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features and controls  
2 ch amp PB 481X  
pb481X  
power LED  
protection LED  
low level inputs  
high level inputs  
high pass frequency control  
low pass frequency control  
input level control  
4
bass boost level  
crossover mode selector  
power terminals  
power fuse  
speaker connections  
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features and specifications  
2 ch amp PB 481  
X
crossover mode selector 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.  
output power @ 14.4v DC, 1KHz  
RMS Power @ 4 Ohms  
RMS Power @ 2 Ohms  
Maximum Power Output  
40 Watts x 2  
60 Watts x 2  
300 Watts x 2  
input level control 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.  
frequency response  
15 Hz-30 KHz  
input impedance  
low level inputs  
high level inputs  
low pass frequency control when the crossover selector switch is in “low pass” mode, this control  
sets the upper frequency limit for audio program sent to the speakers.  
10K Ohms  
100 Ohms  
high pass frequency control when the crossover selector switch is in “high pass” mode, this control  
sets the lower frequency limit for audio program sent to the speakers.  
input sensitivity  
low level inputs  
high level inputs  
5
bass boost level control this control permits adjustment of the bass level up to an increase of  
250mV  
2.5V  
approximately 18 dB.  
low level inputs this amp features gold-plated RCA input jacks for high impedance input.  
power supply voltage  
14.4V DC Neg. Ground (10.5-16V)  
Use these with car stereo output which uses RCA-type connector cables.  
high level inputs if your car stereo lacks RCA-type output jacks, you may connect speaker  
matching speaker impedance  
output leads to these input connectors.  
stereo mode  
bridged mode  
2-4 Ohms  
4-8 Ohms  
power LED this indicator is illuminated when power is applied.  
protection LED this indicator is illuminated when built-in protection circuitry is activated.  
15A  
maximum current draw  
dimensions (W x H x L)  
power fuse the fuse protects the amplifier and your car’s electrical system from short  
circuit conditions.  
mm  
inches  
276 x 60 x 209  
10.9 x 2.4 x 8.25  
power terminals use these connectors to deliver power, ground and remote turn-on control  
to the amplifier.  
speaker connections these terminals are 14K gold plated to guarantee high conductivity and  
minimum signal loss.  
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features and controls  
2 ch amp PB 7 8 1 X  
pb781X  
power LED  
protection LED  
low level inputs  
high level inputs  
high pass frequency control  
low pass frequency control  
input level control  
6
bass boost level  
crossover mode selector  
power terminals  
power fuse  
speaker connections  
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features and specifications  
2 ch amp PB 7 8 1 X  
crossover mode selector when used with normal, full range systems, set this switch to FULL.If  
output power @ 14.4v DC, 1KHz  
you wish to use the internal crossover to power a driver of specific frequency  
RMS Power @ 4 Ohms  
RMS Power @ 2 Ohms  
Maximum Power Output  
50 Watts x 2  
75 Watts x 2  
500 Watts x 2  
range, use the LOWPASSor HIGHPASSsettings.  
input level control use this control to match the outputs of your head unit to the amplifier.  
Starting with your head unit set at about the 2 oclock position, increase  
the amp level control until distortion begins to occur, and reduce slightly  
from this point.  
frequency response  
input impedance  
15 Hz-30 KHz  
low pass frequency control when the crossover selector switch is in low passmode, this control  
sets the upper frequency limit for audio program sent to the speakers.  
low level inputs  
high level inputs  
10K Ohms  
100 Ohms  
high pass frequency control when the crossover selector switch is in high passmode, this control  
sets the lower frequency limit for audio program sent to the speakers.  
input sensitivity  
low level inputs  
high level inputs  
7
bass boost level control this control permits adjustment of the bass level up to an increase of  
250mV  
2.5V  
approximately 18 dB.  
low level inputs this amp features gold-plated RCA input jacks for high impedance input.  
power supply voltage  
14.4V DC Neg. Ground (10.5-16V)  
Use these with car stereo output which uses RCA-type connector cables.  
high level inputs if your car stereo lacks RCA-type output jacks, you may connect speaker  
matching speaker impedance  
output leads to these input connectors.  
stereo mode  
bridged mode  
2-4 Ohms  
4-8 Ohms  
power LED this indicator is illuminated when power is applied.  
protection LED this indicator is illuminated when built-in protection circuitry is activated.  
15A  
maximum current draw  
dimensions (W x H x L)  
power fuse the fuse protects the amplifier and your cars electrical system from short  
circuit conditions.  
mm  
inches  
276 x 60 x 279  
10.9 x 2.4 x 11  
power terminals use these connectors to deliver power, ground and remote turn-on control  
to the amplifier.  
speaker connections these terminals are 14K gold plated to guarantee high conductivity and  
minimum signal loss.  
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features and controls  
2 ch amp PB 1 2 8 1 X  
power LED  
protection LED  
pb1281X  
low level inputs  
high level inputs  
Remote Bass Boost  
high pass frequency control  
low pass frequency control  
input level control  
8
bass boost level  
crossover mode selector  
power terminals  
power fuse  
speaker connections  
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features and specifications  
2 ch amp PB 1 2 8 1 X  
crossover mode selector when used with normal, full range systems, set this switch to FULL.If  
output power @ 14.4v DC, 1KHz  
you wish to use the internal crossover to power a driver of specific frequency  
RMS Power @ 4 Ohms  
RMS Power @ 2 Ohms  
Maximum Power Output  
75 Watts x 2  
120 Watts x 2  
800 Watts x 2  
range, use the LOWPASSor HIGHPASSsettings.  
input level control use this control to match the outputs of your head unit to the amplifier.  
Starting with your head unit set at about the 2 oclock position, increase  
the amp level control until distortion begins to occur, and reduce slightly  
from this point.  
frequency response  
15 Hz-30 KHz  
input impedance  
low level inputs  
high level inputs  
lowpassfrequencycontrol when the crossover selector switch is in low passmode, this control  
sets the upper frequency limit for audio program sent to the speakers.  
10K Ohms  
100 Ohms  
highpassfrequencycontrol when the crossover selector switch is in high passmode, this control  
sets the lower frequency limit for audio program sent to the speakers.  
input sensitivity  
low level inputs  
high level inputs  
9
Remote Bass Boost Plug in the Remote Bass Boost Control wire in here.  
250mV  
2.5V  
bass boost level control this control permits adjustment of the bass level up to an increase of  
approximately 18 dB.  
power supply voltage  
14.4V DC Neg. Ground (10.5-16V)  
low level inputs this amp features gold-plated RCA input jacks for high impedance input.  
Use these with car stereo output which uses RCA-type connector cables.  
matching speaker impedance  
stereo mode  
bridged mode  
2-4 Ohms  
4-8 Ohms  
high level inputs if your car stereo lacks RCA-type output jacks, you may connect speaker  
output leads to these input connectors.  
power LED this indicator is illuminated when power is applied.  
20A  
maximum current draw  
dimensions (W x H x L)  
protection LED this indicator is illuminated when built-in protection circuitry is activated.  
mm  
inches  
276 x 60 x 394  
10.9 x 2.4x 15.5  
power fuse the fuse protects the amplifier and your cars electrical system from short  
circuit conditions.  
power terminals use these connectors to deliver power, ground and remote turn-on control  
to the amplifier.  
speaker connections these terminals are 14K gold plated to guarantee high conductivity and  
minimum signal loss.  
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features and controls  
4 ch amp PB 681X • PB881X  
power LED  
protection LED  
ch 1/2 input level control  
ch 1/2 high level inputs  
ch 3/4 input level control  
ch 3/4 high level inputs  
pb681X  
pb881X  
ch 3/4 low level inputs  
ch 1/2 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  
ch 1/2 crossover mode selector switch 10  
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  
speaker connections  
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features and specifications  
4 ch amp PB 681X • PB881X  
PB  
PB  
881X  
681X  
dual crossover mode selectors 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  
output power @ 14.4v DC, 1KHz  
frequency range, use the LOWPASSor HIGHPASSsettings.  
RMS Power @ 4 Ohms  
RMS Power @ 2 Ohms  
Maximum Power Output  
35 Watts x 4  
55 Watts x 4  
250 Watts x 4  
50 Watts x 4  
60 Watts x 4  
300 Watts x 4  
dual input level controls use these controls to match the outputs of your head unit to the amplifier.  
Starting with your head unit set at about the 2 oclock position, increase  
the amp level controls until distortion begins to occur, and reduce slightly  
from this point.  
frequency response  
input impedance  
15 Hz-30 KHz  
duallowpassfrequencycontrols 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.  
low level inputs  
high level inputs  
10K Ohms  
100 Ohms  
dualhighpassfrequencycontrols when the one or both of crossover selector switch is in high passmode,  
one can set the lower frequency limit for audio program sent to the  
speakers.  
input sensitivity  
low level inputs  
high level inputs  
11  
250mV  
2.5V  
dual bass boost level controls this control permits adjustment of the bass level up to an increase of  
approximately 18 dB in either or both pairs of channels.  
power supply voltage  
14.4V DC Neg. Ground (10.5-16V)  
low level inputs this amp features gold-plated RCA input jacks for high impedance input.  
Use these with car stereo output which uses RCA-type connector cables.  
matching speaker impedance  
high level inputs if your car stereo lacks RCA-type output jacks, you may connect speaker  
stereo mode  
bridged mode  
2-4 Ohms  
4-8 Ohms  
output leads to these input connectors.  
power LED this indicator is illuminated when power is applied.  
maximum current draw  
dimensions (W x H x L)  
20 A  
30 A  
protection LED this indicator is illuminated when built-in protection circuitry is activated.  
power fuse the fuse protects the amplifier and your cars electrical system from short  
mm  
inches  
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  
circuit conditions.  
power terminals use these connectors to deliver power, ground and remote turn-on control  
to the amplifier.  
speaker connections these terminals are 14K gold plated to guarantee high conductivity and  
minimum signal loss.  
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features and controls  
4 ch amp PB 1881  
X
Remote Bass Boost  
ch 1/2 input level control  
ch 1/2 high level inputs  
ch 3/4 input level control  
ch 3/4 high level inputs  
pb1881X  
ch 3/4 low level inputs  
ch 1/2 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  
ch 1/2 crossover mode selector switch 12  
ch 1/2 bass boost level control  
ch 1/2 low pass frequency control  
ch 1/2 high pass frequency control  
protection LED  
power LED  
power terminals  
power fuse  
speaker connections  
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features and specifications  
4 ch amp PB 1881X  
1881X  
PB  
dual crossover mode selectors 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 LOWPASSor HIGHPASSsettings.  
output power @ 14.4v DC, 1KHz  
RMS Power @ 4 Ohms  
RMS Power @ 2 Ohms  
Maximum Power Output  
75 Watts x 4  
120 Watts x 4  
450 Watts x 4  
dual input level controls use these controls to match the outputs of your head unit to the amplifier.  
Starting with your head unit set at about the 2 oclock position, increase  
the amp level controls until distortion begins to occur, and reduce slightly  
from this point.  
frequency response  
input impedance  
15 Hz-30 KHz  
duallowpassfrequencycontrols 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.  
low level inputs  
10K Ohms  
100 Ohms  
dualhighpassfrequencycontrols when the one or both of crossover selector switch is in high passmode,  
high level inputs  
one can set the lower frequency limit for audio program sent to the  
speakers.  
input sensitivity  
low level inputs  
high level inputs  
13  
CH 3/4 Remote Bass Boost Plug in the Remote Bass Boost Control wire in here.  
250mV  
2.5V  
dual bass boost level controls this control permits adjustment of the bass level up to an increase of  
approximately 18 dB in either or both pairs of channels.  
power supply voltage  
14.4V DC Neg. Ground (10.5-16V)  
low level inputs this amp features gold-plated RCA input jacks for high impedance input.  
Use these with car stereo output which uses RCA-type connector cables.  
matching speaker impedance  
stereo mode  
bridged mode  
2-4 Ohms  
4-8 Ohms  
high level inputs if your car stereo lacks RCA-type output jacks, you may connect speaker  
output leads to these input connectors.  
power LED this indicator is illuminated when power is applied.  
maximum current draw  
dimensions (W x H x L)  
40 A  
protection LED this indicator is illuminated when built-in protection circuitry is activated.  
mm  
inches  
power fuse the fuse protects the amplifier and your cars electrical system from short  
276 x 60 x 432  
10.9 x 2.4 x 17  
circuit conditions.  
power terminals use these connectors to deliver power, ground and remote turn-on control  
to the amplifier.  
speaker connections these terminals are 14K gold plated to guarantee high conductivity and  
minimum signal loss.  
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electrical connections  
2 ch amp PB481X • PB781X • PB1281X  
pb481X  
pb781X  
pb1281X  
REM  
FUSE  
GROUND  
L
R
+12V BATT  
+
-
+
-
-
14  
+
BRIDGED  
12V battery  
head unit  
to remote turn-on  
+12V  
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electrical connections  
4 ch amp PB681X • PB881X • PB1881X  
REM  
FUSE  
GROUND  
CH1  
CH2  
CH3  
CH4  
pb681X  
pb881X  
pb1881X  
+12V BATT  
+
-
+
-
-
+
-
+
-
-
+
+
BRIDGED  
BRIDGED  
12V battery  
15  
head unit  
REM  
FUSE  
CH1  
CH2  
CH3  
CH4  
GROUND  
+12V BATT  
+
-
+
-
-
+
-
+
-
-
to remote turn-on  
+12V  
+
+
BRIDGED  
BRIDGED  
12V battery  
head unit  
to remote turn-on  
+12V  
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stereo input connections  
2 ch amp PB481X • PB781X • PB1281X  
using low level inputs  
pb481X  
pb781X  
pb1281X  
head unit  
L/R Audio  
Outputs  
16  
PLEASE NOTE! If using high level  
inputs, do not use the low level RCA  
inputs at the same time!  
using high level inputs  
head unit  
L
L
R
R
wiring harness  
from speaker terminals  
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mono input connections  
2 ch amp PB481X • PB781X • PB1281X  
using low level inputs  
pb481X  
pb781X  
pb1281X  
head unit  
To a second amplifier  
17  
Y Adaptors  
PLEASE NOTE! If using high level  
inputs, do not use the low level RCA  
inputs at the same time!  
using high level inputs  
head unit  
To a second amplifier  
L
L
R
R
wiring harness  
wiring harness  
from speaker terminals  
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2/4 channel input connections  
4 ch amp PB681X • PB881X • PB1881X  
4 CH input connections using low level inputs  
BASS  
BOOST  
BASS  
BOOST  
CH 4  
CH 3  
LEVEL  
FREQ.  
LPF  
HPF  
HPF  
LPF  
FREQ.  
LEVEL  
CH 2  
CH 1  
pb681X  
pb881X  
pb1881X  
+
-
-
+
+
-
-
+
CH4 CH3  
HI IN  
CH2 CH1  
HI IN  
HPF  
LPF  
FULL  
HPF  
LPF  
FULL  
MIN  
MAX  
0
+18db 35  
400  
80  
2.5k  
80  
2.5k 35  
400  
0
+18db  
MIN MAX  
Hz  
Hz  
Hz  
Hz  
REMOTE  
BASS BOOST(CH3/4)  
PROTECT  
POWER  
LOW IN  
LOW IN  
head unit  
L/R FRONT  
Audio Outputs  
18  
L/R REAR  
Audio Outputs  
2 CH input connections using low level inputs  
BASS  
BASS  
CH 4  
CH 3  
LEVEL  
FREQ.  
BOOST  
LPF  
HPF  
HPF  
LPF  
BOOST  
FREQ.  
LEVEL  
CH 2  
CH 1  
+
-
-
+
+
-
-
+
CH4 CH3  
HI IN  
CH2 CH1  
HI IN  
HPF  
LPF  
FULL  
HPF  
LPF  
FULL  
MIN  
MAX  
0
+18db 35  
400  
80  
2.5k  
80  
2.5k 35 400  
Hz  
0
+18db  
MIN MAX  
Hz  
Hz  
Hz  
REMOTE  
BASS BOOST(CH3/4)  
PROTECT  
POWER  
LOW IN  
LOW IN  
R
L
Y adaptors  
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high level input connections  
4 ch amp PB681X • PB881X • PB1881X  
4 CH floating ground connections  
pb681X  
pb881  
pb1881  
BASS  
BOOST  
BASS  
BOOST  
CH 4  
CH 3  
LEVEL  
FREQ.  
LPF  
HPF  
HPF  
LPF  
FREQ.  
LEVEL  
CH 2  
CH 1  
X
X
+
-
-
+
+
-
-
+
CH4 CH3  
HI IN  
CH2 CH1  
HI IN  
HPF  
LPF  
FULL  
HPF  
LPF  
FULL  
MIN  
MAX  
0
+18db 35  
400  
80  
2.5k  
80  
2.5k 35 400  
Hz  
0
+18db  
MIN MAX  
Hz  
Hz  
Hz  
REMOTE  
BASS BOOST(CH3/4)  
PROTECT  
POWER  
LOW IN  
LOW IN  
1
9
4 CH harness wiring for common ground connections  
CH 3/4  
CH 1/2  
REAR  
L
R
L
R
FRONT  
ORANGE  
ORANGE  
BLACK  
REAR  
L
R
L
R
FRONT  
BLACK  
BLACK  
ORANGE  
BLACK  
ORANGE  
ORANGE  
ORANGE  
from speaker terminals  
BLACK  
BLACK  
ORANGE  
BLACK  
BLACK  
PLEASE NOTE! If using high level inputs,  
do not use the low level RCA inputs at  
the same time!  
ORANGE  
from speaker terminals  
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mono input connections  
4 ch amp PB681X • PB881X • PB1881X  
4 CH mono input connections using low level inputs  
BASS  
BOOST  
BASS  
BOOST  
CH 4  
CH 3  
LEVEL  
FREQ.  
LPF  
HPF  
HPF  
LPF  
FREQ.  
LEVEL  
CH 2  
CH 1  
pb681X  
pb881  
pb1881  
+
-
-
+
+
-
-
+
CH4 CH3  
HI IN  
CH2 CH1  
HI IN  
HPF  
LPF  
FULL  
HPF  
LPF  
FULL  
MIN  
MAX  
0
+18db 35  
400  
80  
2.5k  
80  
2.5k 35 400  
Hz  
0
+18db  
MIN MAX  
Hz  
Hz  
Hz  
REMOTE  
BASS BOOST(CH3/4)  
X
X
PROTECT  
POWER  
LOW IN  
LOW IN  
head unit  
LEFT FRONT Audio Outputs  
20  
RIGHT FRONT Audio Outputs  
RIGHT REAR Audio Outputs  
LEFT REAR Audio Outputs  
2 CH mono input connections using low level inputs  
BASS  
BOOST  
BASS  
BOOST  
CH 4  
CH 3  
LEVEL  
FREQ.  
LPF  
HPF  
HPF  
LPF  
FREQ.  
LEVEL  
CH 2  
+
-
-
+
+
-
-
+
CH4 CH3  
HI IN  
CH2 CH1  
HI IN  
HPF  
LPF  
FULL  
HPF  
LPF  
FULL  
MIN  
MAX  
0
+18db 35  
400  
80  
2.5k  
80  
2.5k 35 400  
Hz  
0
+18db  
MIN MAX  
Hz  
Hz  
Hz  
CH 1  
REMOTE  
BASS BOOST(CH3/4)  
PROTECT  
POWER  
LOW IN  
LOW IN  
L
R
Y adaptors  
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high level mono input connections  
4 ch amp PB681X • PB881X • PB1881X  
4 CH floating ground connections  
BASS  
BOOST  
BASS  
BOOST  
CH 4  
CH 3  
LEVEL  
FREQ.  
LPF  
HPF  
HPF  
LPF  
FREQ.  
LEVEL  
CH 2  
CH 1  
pb681X  
pb881X  
pb1881X  
+
-
-
+
+
-
-
+
CH4 CH3  
HI IN  
CH2 CH1  
HI IN  
HPF  
LPF  
FULL  
HPF  
LPF  
FULL  
MIN  
MAX  
0
+18db 35  
400  
80  
2.5k  
80  
2.5k 35 400  
Hz  
0
+18db  
MIN MAX  
Hz  
Hz  
Hz  
REMOTE  
BASS BOOST(CH3/4)  
4 CH harness wiring  
for common ground connections  
PROTECT  
POWER  
LOW IN  
LOW IN  
CH 3/4  
21  
CH 1/2  
R
L
ORANGE  
BLACK  
ORANGE  
BLACK  
R
L
BLACK  
BLACK  
ORANGE  
ORANGE  
ORANGE  
BLACK  
ORANGE  
BLACK  
from speaker terminals  
PLEASE NOTE! If using high level inputs,  
do not use the low level RCA inputs at  
the same time!  
BLACK  
BLACK  
ORANGE  
ORANGE  
from speaker terminals  
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speaker connections  
2 ch amp PB481X • PB781X • PB1281X  
Stereo Output Mode  
pb481X  
pb781X  
pb1281X  
22  
Bridged Mono Output Mode  
LEFT speaker  
RIGHT speaker  
MINIMUM  
SPEAKER  
IMPEDANCE  
4 OHMS!  
speaker  
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speaker connections  
4 ch amp PB681X • PB881X • PB1881X  
4 CH Output Mode  
REM  
FUSE  
GROUND  
CH1  
CH2  
CH3  
CH4  
+12V BATT  
+
-
+
-
-
+
-
+
-
-
pb681X  
pb881X  
pb1881X  
+
+
BRIDGED  
BRIDGED  
23  
L
R
FRONT speakers  
REAR speakers  
R
L
Bridged Dual Mono Output Mode  
REM  
FUSE  
CH1  
CH2  
CH3  
CH4  
GROUND  
+12V BATT  
+
-
+
-
-
+
-
+
-
-
MINIMUM  
SPEAKER  
IMPEDANCE  
4 OHMS!  
+
+
BRIDGED  
BRIDGED  
speakers  
L
R
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speaker connections  
4 ch amp PB681X • PB881X • PB1881X  
2 CH Bridged Output Mode with Subwoofer Output  
pb681X  
pb881X  
pb1881X  
REM  
FUSE  
CH1  
CH2  
CH3  
CH4  
GROUND  
+12V BATT  
+
-
+
-
-
+
-
+
-
-
24  
+
+
BRIDGED  
BRIDGED  
MINIMUM  
SPEAKER  
IMPEDANCE  
4 OHMS!  
R
L
SPEAKERS  
SUBWOOFER  
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mounting and installation  
mounting  
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.  
25  
wiring tips  
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.  
fuAsbouet powser 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.  
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protection  
circuitry  
troubleshooting  
No output.  
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.  
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.  
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.  
If this occurs, carefully inspect the system to  
determine the source of the problem.  
Only one channel works.  
Confirm that all terminal strip connections are secure and tight.  
26  
If the shutdown was a result of a thermal overload  
condition, allow the amplifier to cool down before  
attempting to restart it.  
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.  
If the shutdown was a result of an input overload,  
or speaker short circuit, be sure to correct the  
condition before restarting.  
Weak output.  
Readjust the Input Level Control(s) to better suit the input signal.  
The amplifier can be restarted by turning the remote  
power OFF and then ON again.  
Noise in the audio.  
If the noise is a whinewhose 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 clickingor poppingnoise 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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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.  
27  
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 isnt covered in the manufacturers  
warranty.  
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