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.
general features
PB481X PB781X PB1281
· 300 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
· 500 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
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
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
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.
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
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 “LOWPASS” or “HIGHPASS” settings.
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
input impedance
15 Hz-30 KHz
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.
low level inputs
high level inputs
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
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 car’s 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.
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
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 “LOWPASS” or “HIGHPASS” settings.
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
lowpassfrequencycontrol 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
highpassfrequencycontrol 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
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 car’s 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.
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
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 “LOWPASS” or “HIGHPASS” settings.
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 o’clock 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 pass” mode,
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 car’s 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.
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
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 “LOWPASS” or “HIGHPASS” settings.
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 o’clock 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 pass” mode,
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 car’s 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.
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
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
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
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
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
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
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
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
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
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
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
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.
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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.
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.
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• 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 “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.
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.
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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.
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