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

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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 2-3

features and specifications

PB481X 4-5

PB781X 6-7

PB1281X 8-9 PB681X/PB881X 10-11

PB1881X 12-13

electrical connections

PB481X/PB781X/PB1281X 14 PB681X/PB881X/PB1881X 15

stereo input connections

PB481X/PB781X/PB1281X 16

mono input connections

PB481X/PB781X/PB1281X 17

2/4 channel input connections

PB681X/PB881X/PB1881X 18

high level input connections

 

 

PB681X/PB881X/PB1881X

19

 

mono input connections

 

 

PB681X/PB881X/PB1881X

20

 

high level mono input connections

 

 

PB681X/PB881X/PB1881X

21

 

speaker connections

 

 

PB481X/PB781X/PB1281X

22

1

speaker connections

 

PB681X/PB881X/PB1881X

23-24

 

mounting and installation

25

 

protection circuitry and troubleshooting

26

 

precautions

27

 

general features

PB481X

PB781X

PB1281X

 

High Performance 600 Watt 2 Channel

High Performance 1000 Watt 2 Channel

High Performance 1600 Watt 2 Channel

 

Bridgeable MOSFET Amplifier

Bridgeable MOSFET Amplifier

Bridgeable MOSFET Amplifier

 

· 300 Watts x 2 Output

· 500 Watts x 2 Output

· 800 Watts x 2 Output

 

· 600 Watts x 1 Bridged Output

· 1000 Watts x 1 Bridged Output

· 1600 Watts x 1 Bridged Output

 

· Variable Hi/Lo Electronic Crossover

· Variable Hi/Lo Electronic Crossover

· Variable Hi/Lo Electronic Crossover

 

Network

Network

Network

 

· Variable Bass Boost (0 - +18 dB @ 60Hz)

· Variable Bass Boost (0 - +18 dB @ 60Hz)

· Variable Bass Boost (0 - +18 dB @ 60Hz)

 

· Variable Input Level (Gain) Control

· Variable Input Level (Gain) Control

· Variable Input Level (Gain) Control

2

· Remote Turn On/Off

· Remote Turn On/Off

· Remote Turn On/Off

· Gold Plated RCA Inputs

· Gold Plated RCA Inputs

· Gold Plated RCA Inputs

 

· High Level MOLEX Input

· High Level MOLEX Input

· High Level MOLEX Input

 

· Power ON LED Indicator

· Power ON LED Indicator

· Power ON LED Indicator

 

· LED Protection Indicator

· LED Protection Indicator

· LED Protection Indicator

 

· S/N Ratio: > 95 dB

· S/N Ratio: > 95 dB

· 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

 

 

 

· Anti-Thump Turn-On

 

general features

PB681X

PB881X

PB1881X

 

High Performance 1000 Watt 4 Channel

High Performance 1200 Watt 4 Channel

High Performance 1800 Watt 4 Channel

 

Bridgeable MOSFET Amplifier

Bridgeable MOSFET Amplifier

Bridgeable MOSFET Amplifier

 

· 250 Watts x 4 Output

· 300 Watts x 4 Output

· 450 Watts x 4 Output

 

· 500W x 2 Bridged Output (250W x 2 + 500W x 1)

· 600W x 2 Bridged Output (300W x 2 + 600W x 1)

· 900W x 2 Bridged Output (450W x 2 + 900W x 1)

 

· Dual Variable Hi/Lo Electronic Crossover Network

· Dual Variable Hi/Lo Electronic Crossover Network

· Dual Variable Hi/Lo Electronic Crossover Network

 

· Dual Variable Bass Boost (0 - +18 dB @ 60Hz)

· Dual Variable Bass Boost (0 - +18 dB @ 60Hz)

· Dual Variable Bass Boost (0 - +18 dB @ 60Hz)

 

· Variable Input Level (Gain) Control

· Variable Input Level (Gain) Control

· Variable Input Level (Gain) Control

3

· Remote Turn On/Off

· Remote Turn On/Off

· Remote Turn On/Off

 

· Gold Plated RCA Inputs

· Gold Plated RCA Inputs

· Gold Plated RCA Inputs

 

· High Level MOLEX Inputs

· High Level MOLEX Inputs

· High Level MOLEX Inputs

 

· Power ON LED Indicator

· Power ON LED Indicator

· Power ON LED Indicator

 

· LED Protection Indicator

· LED Protection Indicator

· LED Protection Indicator

 

· S/N Ratio: > 95 dB

· S/N Ratio: > 95 dB

· 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

 

pb481X power LED protection LED

high pass frequency control low pass frequency control bass boost level

crossover mode selector

speaker connections

features and controls

2 c h a m p P B 4 8 1 X

low level inputs

 

high level inputs

 

input level control

4

power terminals

power fuse

features and specifications

2 c h a m p P B 4 8 1 X

used with normal, full range systems, set this switch to “FULL.” If to use the internal crossover to power a driver of specific frequency

use the “LOWPASS” or “HIGHPASS” settings.

control to match the outputs of your head unit to the amplifier. 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.

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.

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.

bass boost level control this control permits adjustment of the bass level up to an increase of approximately 18 dB.

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.

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.

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 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.

output power @ 14.4v DC, 1KHz

 

 

RMS Power @ 4 Ohms

40 Watts x 2

 

RMS Power @ 2 Ohms

60 Watts x 2

 

Maximum Power Output

300 Watts x 2

 

frequency response

15 Hz-30 KHz

 

input impedance

 

 

low level inputs

10K Ohms

 

high level inputs

100 Ohms

 

input sensitivity

 

5

low level inputs

250mV

high level inputs

2.5V

 

power supply voltage

14.4V DC Neg. Ground (10.5-16V)

 

matching speaker impedance

 

 

stereo mode

2-4 Ohms

 

bridged mode

4-8 Ohms

 

maximum current draw

15A

 

dimensions (W x H x L)

 

 

mm

276 x 60 x 209

 

inches

10.9 x 2.4 x 8.25

 

pb781X power LED protection LED

high pass frequency control low pass frequency control bass boost level

crossover mode selector

speaker connections

features and controls

2 c h a m p P B 7 8 1 X

low level inputs

 

high level inputs

 

input level control

6

power terminals

power fuse

features and specifications

2 c h a m p P B 7 8 1 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.

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.

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.

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.

bass boost level control this control permits adjustment of the bass level up to an increase of approximately 18 dB.

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.

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.

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 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.

output power @ 14.4v DC, 1KHz

 

 

RMS Power @ 4 Ohms

50 Watts x 2

 

RMS Power @ 2 Ohms

75 Watts x 2

 

Maximum Power Output

500 Watts x 2

 

frequency response

15 Hz-30 KHz

 

input impedance

 

 

low level inputs

10K Ohms

 

high level inputs

100 Ohms

 

input sensitivity

 

7

low level inputs

250mV

high level inputs

2.5V

 

power supply voltage

14.4V DC Neg. Ground (10.5-16V)

 

matching speaker impedance

 

 

stereo mode

2-4 Ohms

 

bridged mode

4-8 Ohms

 

maximum current draw

15A

 

dimensions (W x H x L)

 

 

mm

276 x 60 x 279

 

inches

10.9 x 2.4 x 11

 

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

features and controls

2 c h a m p P B 1 2 8 1 X

pb1281X

power LED

 

protection LED

 

Remote Bass Boost

high pass frequency control low pass frequency control bass boost level

crossover mode selector

low level inputs

 

high level inputs

 

input level control

8

speaker connections

power terminals

 

power fuse

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