-1838GX PB-738GX
-238GX PB-638GX PB-1038GX
USER'S MANUAL |
www.pyramidcaraudio.com |
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, PB1838GX, you’ll know you made the right choice with a Pyramid Power amplifier.
table of contents
general features 2-3
features and specifications
PB-238GX 4-5
PB-738GX 6-7 PB-1838GX
PB-638GX/PB-1038GX 8-9
electrical connections
PB-238GX 10-11 PB-638GX/PB-738GX PB-1038GX/PB-1838GX
stereo input connections
PB-738GX/PB-1838GX 12
mono input connections
PB-738GX/PB-1838GX 13
2/4 channel input connections
PB-238GX 14-15
high level input connections
PB-638GX/PB-1038GX 16-17
mono input connections
PB-638GX/PB-1038GX 18
high level mono input connections
PB-638GX/PB-1038GX 19
speaker connections |
1 |
PB-738GX/PB-1838GX 20
speaker connections
PB-238GX/PB-638GX/PB-1038GX 21-22
mounting and installation |
23 |
protection circuitry and troubleshooting |
24 |
precautions |
25 |
PB-238GX
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
general features
PB-638GX |
PB-738GX |
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High Performance 1600 Watt 4 Channel |
High Performance 1000 Watt 2 Channel |
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Bridgeable MOSFET Amplifier |
Bridgeable MOSFET Amplifier |
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· 400 Watts x 4 Output |
· 500 Watts x 2 Output |
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· 800W x 2 Bridged Output (400W x 2 + 800W x 1) |
· 1000W x 1 Bridged Output |
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· Dual Variable Hi/Lo Electronic Crossover Network |
· Variable Hi/Lo Electronic Crossover Network |
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· Dual Variable Bass Boost (0 - +18 dB @ 60Hz) |
· Variable Bass Boost (0 - +18 dB @ 60Hz) |
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· Variable Input Level (Gain) Control |
· Variable Input Level (Gain) Control |
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· Remote Turn On/Off |
· Remote Turn On/Off |
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· Gold Plated RCA Inputs |
· Gold Plated RCA Inputs |
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· High Level MOLEX Inputs |
· High Level MOLEX Inputs |
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· Power ON LED Indicator |
· Power ON LED Indicator |
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· LED Protection Indicator |
· LED Protection Indicator |
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· Remote Bass Boost |
· Remote Bass Boost |
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· S/N Ratio: > 95 dB |
· S/N Ratio: > 95 dB |
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· THD: <0.04% |
· THD: <0.04% |
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· Thermal Protection |
· Thermal Protection |
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· Overload Protection |
· Overload Protection |
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· Short Circuit Protection |
· Short Circuit Protection |
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· Anti-Thump Turn-On |
· Anti-Thump Turn-On |
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· Tri-Mode Configurable |
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general features |
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PB-1038GX |
PB-1836GX |
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High Performance 4000 Watt 4 Channel |
High Performance 3000 Watt 2 Channel |
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Bridgeable MOSFET Amplifier |
Bridgeable MOSFET Amplifier |
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· 1000 Watts x 4 Output |
· 1500 Watts x 2 Output |
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· 2000 Watts x 2 Bridged Output(1000Wx2+2000Wx1) |
· 3000W x 1 Bridged Output |
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· Dual Variable Hi/Lo Electronic Crossover Network |
· Variable Hi/Lo Electronic Crossover Network |
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· Dual Variable Bass Boost (0 - +18 dB @ 60Hz) |
· Variable Bass Boost (0 - +18 dB @ 60Hz) |
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· Variable Input Level (Gain) Control |
· Variable Input Level (Gain) Control |
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· Remote Turn On/Off |
· Remote Turn On/Off |
3 |
· Gold Plated RCA Inputs |
· Gold Plated RCA Inputs |
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· High Level MOLEX Inputs |
· High Level MOLEX Inputs |
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· Power ON LED Indicator |
· Power ON LED Indicator |
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· LED Protection Indicator |
· LED Protection Indicator |
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· Remote Bass Boost |
· Remote Bass Boost |
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· S/N Ratio: > 95 dB |
· S/N Ratio: > 95 dB |
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· THD: <0.04% |
· THD: <0.04% |
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· Thermal Protection |
· Thermal Protection |
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· Overload Protection |
· Overload Protection |
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· Short Circuit Protection |
· Short Circuit Protection |
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· Anti-Thump Turn-On |
· Anti-Thump Turn-On |
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· Tri-Mode Configurable
high level inputs low level inputs input level control
speaker connections
features and controls
4 ch amp PB-238GX
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4 CHANNEL POWER AMPLIFIER |
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power LED |
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LOW IN |
LOW IN |
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CH 4 |
CH 3 |
CH 2 |
CH 1 |
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HI |
IN |
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LEVEL |
LEVEL |
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HI |
IN |
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CH4 CH3 |
POWER |
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CH2 CH1 |
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- |
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+ |
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+ |
- |
- |
+ |
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MIN MAX |
MIN MAX |
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4
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FUSE |
REM |
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CH1 |
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CH2 |
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CH3 |
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CH4 |
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+ |
- |
+ |
- |
+ |
- |
+ |
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GROUND |
+12V BATT |
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high level inputs low level inputs input level control
power terminals
power fuse
features and specifications
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 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.
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.
4 ch amp PB-238GX
output power @ 14.4v DC, 1KHz |
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RMS Power @ 4 Ohms |
30 Watts x 4 |
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Maximum Power Output |
100 Watts x 4 |
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frequency response |
15 Hz-30 KHz |
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input impedance |
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low level inputs |
10K Ohms |
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high level inputs |
100 Ohms |
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input sensitivity |
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5 |
low level inputs |
250mV |
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high level inputs |
2.5V |
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power supply voltage |
14.4V DC Neg. Ground (10.5-16V) |
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matching speaker impedance |
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stereo mode |
2-4 Ohms |
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bridged mode |
4-8 Ohms |
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maximum current draw |
10A |
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dimensions (W x H x L) |
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mm |
274 x 61 x 235 |
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inches |
10.8 x 2.4 x 9.25 |
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features and controls
2 ch amp PB-738GX • PB-1238GX
power LED |
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protection LED |
2 CHANNEL MOSFET AMPLIFIER |
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BASS BOOST |
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L |
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REMOTE |
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HPF |
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LPF |
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BASS |
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LEVEL |
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Remote Bass Boost |
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BOOST |
FREQ. |
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HI IN |
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PROTECT POWER |
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R |
+R - - L+ |
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80 |
2.5k |
35 |
400 |
0 |
+18db |
HPF |
MIN |
MAX |
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Hz |
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Hz |
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LPF |
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LOW IN |
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FULL |
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high pass frequency control low pass frequency control bass boost level
crossover mode selector
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FUSE |
REM |
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L |
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R |
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GROUND |
+12V BATT |
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- |
+ |
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speaker connections |
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+ |
BRIDGED |
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- |
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6
high level inputs low level inputs input level control
power terminals
power fuse
features and specifications
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.
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.
low pass frequency controls 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.
high pass frequency controls 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.
Remote Bass Boost Plug in the Remote Bass Boost Control wire in here.
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.
2 ch amp PB-738GX • PB-1838GX
output power @ 14.4v DC, 1KHz |
PB-738GX |
PB-1838GX |
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RMS Power @ 4 Ohms |
75 Watts x 2 |
150 Watts x 2 |
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RMS Power @ 2 Ohms |
125 Watts x 2 |
250 Watts x 2 |
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Maximum Power Output |
500 Watts x 2 |
1500 Watts x 2 |
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frequency response |
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15 Hz-30 KHz |
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input impedance |
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low level inputs |
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10K Ohms |
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high level inputs |
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100 Ohms |
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input sensitivity |
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7 |
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low level inputs |
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250mV |
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high level inputs |
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2.5V |
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power supply voltage |
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14.4V DC Neg. Ground (10.5-16V) |
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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.
matching speaker impedance |
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stereo mode |
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2-4 Ohms |
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bridged mode |
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4-8 Ohms |
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maximum current draw |
20 A |
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40 A |
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dimensions (W x H x L) |
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mm |
274 x 61x 305 |
274 x 61 x 432 |
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inches |
10.8 x 2.4 x 12 |
10.8 x 2.4 x 12 |