Pyramid Car Audio PB681X, PB1281X, PB881X, PB481X, PB1881X User Manual
...
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
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
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
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
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
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
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
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
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
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