Pyramid Car Audio PB-638GX, PB-738GX, PB-1838GX, PB-1038GX, PB-238GX User Manual

PB-1838GX PB-738GX

USER'S MANUAL

PB-238GX

PB-1038GX

www.pyramidcaraudio.com

PB-638GX

congratulations...

on your purchase of a Pyramid Royal Blue 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

PB-238GX, PB-638GX, PB-738GX, PB-1038GX, PB-

1838GX, you’ll know you made the right choice

with a Pyramid Power amplifier.

table of contents

general features

features and specifications

PB-238GX PB-738GX

PB-1838GX

PB-638GX/PB-1038GX

electrical connections

PB-238GX

PB-638GX/PB-738GX

PB-1038GX/PB-1838GX

stereo input connections

PB-738GX/PB-1838GX

mono input connections

PB-738GX/PB-1838GX

2/4 channel input connections

PB-238GX

2-3

4-5 6-7

8-9

10-11

14-15

high level input connections

PB-638GX/PB-1038GX

mono input connections

PB-638GX/PB-1038GX

high level mono input connections

PB-638GX/PB-1038GX

speaker connections

PB-738GX/PB-1838GX

speaker connections

PB-238GX/PB-638GX/PB-1038GX

mounting and installation

protection circuitry and troubleshooting

precautions

16-17

21-22

general features

High Performance 400 Watt 4 Channel Amplifier

· 100 Watts x 4 Output

· Variable Input Level (Gain) Control

· Remote Turn On/Off

· Gold Plated RCA Inputs

· High Level MOLEX Inputs

· Power ON LED Indicator

· S/N Ratio: > 95 dB

· THD: <0.04%

· Overload Protection

· Short Circuit Protection

· Anti-Thump Turn-On

-238G

High Performance 1600 Watt 4 Channel Bridgeable MOSFET Amplifier

· 400 Watts x 4 Output

· 800W x 2 Bridged Output (400W x 2 + 800W 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

-638G

High Performance 1000 Watt 2 Channel Bridgeable MOSFET Amplifier

· 500 Watts x 2 Output

· 1000W 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 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

-738G

general features

High Performance 40 Bridgeable MOSFET Amplifier

· 1000 Watts x 4 Output

· 2000 Watts x 2 Bridged Output(1000Wx2+2000Wx1)

· 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

1038G

00 Watt 4 Channel

PB-1836GX

High Performance 3000 Watt 2 Channel Bridgeable MOSFET Amplifier

· 1500 Watts x 2 Output

· 3000W 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 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

features and controls

4 ch amp PB-238GX

high level inputs low level inputs input level control

speaker connections

HI IN

CH4 CH3

4 CHANNEL POWER AMPLIFIER

LOW IN

CH 4

+ - - +

CH 3

LEVEL

POWER

MIN MAX

LEVEL

LOW IN

CH 1

CH 2

HI IN

CH2 CH1

+ - - +

power LED

high level inputs low level inputs input level control

GROUND

REM

+12V BATT

power terminals

power fuse

CH1

CH2

CH3

CH4

FUSE

features and specifications

4 ch amp PB-238GX

input level control

low level inputs

high level inputs

power LED

power fuse

power terminals

speaker connections

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.

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.

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

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)

inches

30 Watts x 4 100 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

10A

274 x 61 x 235

10.8 x 2.4 x 9.25

features and controls

2 ch amp PB-738GX • PB-1238GX

power LED protection LED

Remote Bass Boost

high pass frequency control low pass frequency control bass boost level

crossover mode selector

speaker connections

REMOTE

BASS BOOST

2 CHANNEL MOSFET AMPLIFIER

POWERPROTECT

BRIDGED

HPF

80 2.5k

LOW IN

HI IN

R L

+ - - +

high level inputs

BASS

LPF

BOOST

400

+18db

LEVEL

FREQ.

HPF

MIN MAX

LPF

FULL

low level inputs input level control

GROUND

REM

+12V BATT

FUSE

power terminals

power fuse

crossover mode selectors

input level controls

low pass frequency controls

high pass frequency controls

Remote Bass Boost Plug in the Remote Bass Boost Control wire in here.

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.

2 ch amp PB-738GX • PB-1838GX

250mV

2.5V

-1838GX

150 Watts x 2 250 Watts x 2 1500 Watts x 2

274 x 61 x 432

10.8 x 2.4 x 12

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)

inches

-738GX

75 Watts x 2 125 Watts x 2 500 Watts x 2

15 Hz-30 KHz

10K Ohms 100 Ohms

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

2-4 Ohms 4-8 Ohms

20 A 40 A

274 x 61x 305

10.8 x 2.4 x 12

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