USER'S MANUAL PB-1838GX PB-738GX PB-238GX PB-1038GX PB- 6 3 8 GX www.pyramidcaraudio.
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 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 2-3 4-5 6-7 8-9 mono input connections PB-738GX/PB-1838GX 2/4 channel input connections PB-238GX mono input connections PB-638GX/PB-1038GX high level mono input connections PB-638GX/PB-1038GX 10-11 speaker connections PB-738GX/PB-1838GX speaker connections stereo input connections PB-738GX/PB-1838GX high level input
general features PB-238GX High Performance 400 Watt 4 Channel Amplifier PB-638GX PB-738GX · 100 Watts x 4 Output · 400 Watts x 4 Output · 500 Watts x 2 Output · Variable Input Level (Gain) Control · 800W x 2 Bridged Output (400W x 2 + 800W x 1) · 1000W x 1 Bridged Output · Remote Turn On/Off · Dual Variable Hi/Lo Electronic Crossover Network · Variable Hi/Lo Electronic Crossover Network · Gold Plated RCA Inputs · Dual Variable Bass Boost (0 - +18 dB @ 60Hz) · Variable Bass Boost (0 - +18 dB
general features PB-1038GX PB-1836GX · 1000 Watts x 4 Output · 1500 Watts x 2 Output · 2000 Watts x 2 Bridged Output(1000Wx2+2000Wx1) · 3000W x 1 Bridged Output · Dual Variable Hi/Lo Electronic Crossover Network · Variable Hi/Lo Electronic Crossover Network · Dual Variable Bass Boost (0 - +18 dB @ 60Hz) · Variable Bass Boost (0 - +18 dB @ 60Hz) · Variable Input Level (Gain) Control · Variable Input Level (Gain) Control · Remote Turn On/Off · Remote Turn On/Off · Gold Plated RCA Inputs · Gold
features and controls 4 ch amp PB-238GX 4 CHANNEL POWER AMPLIFIER LOW IN power LED LOW IN CH 3 CH 4 CH 2 LEVEL HI IN CH4 CH3 CH 1 LEVEL HI IN CH2 CH1 POWER + - - + + - - + MIN MAX MIN MAX high level inputs low level inputs input level control high level inputs low level inputs input level control CH1 + speaker connections CH3 CH2 - + - + + REM FUSE CH4 - - GROUND +12V BATT power terminals power fuse 4
features and specifications 4 ch amp PB-238GX 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. output power @ 14.4v DC, 1KHz RMS Power @ 4 Ohms Maximum Power Output 30 Watts x 4 100 Watts x 4 low level inputs this amp features gold-plated RCA input jacks for high impedance input.
features and controls 2 ch amp PB-738GX • PB-1238GX power LED protection LED 2 CHANNEL MOSFET AMPLIFIER L REMOTE BASS BOOST Remote Bass Boost BASS BOOST LPF HPF PROTECT POWER LEVEL HI IN FREQ. R R 80 Hz 2.
features and specifications 2 ch amp PB-738GX • PB-1838GX crossover mode selectors input level controls low pass frequency controls high pass frequency controls Remote Bass Boost bass boost level controls 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.
features and controls 4 ch amp PB-638GX • PB-1038GX ch 1/2 input level control ch 3/4 input level control LEVEL CH 4 ch 3/4 high level inputs BASS BOOST FREQ. HPF LPF HPF LPF BASS BOOST FREQ. LEVEL CH 2 + - - + + - - + CH4 CH3 HI IN ch 1/2 high level inputs MIN CH 3 MAX HPF LPF FULL 0 +18db 35 Hz 400 80 Hz 80 2.5k Hz 2.
features and specifications 4 ch amp PB-638GX • PB-1038GX dual crossover mode selectors dual input level controls dual low pass frequency controls dual high pass frequency controls CH 3/4 Remote Bass Boost dual bass boost level controls 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.
electrical connections 2 ch amp PB-738GX • PB-1838GX L + + + BRIDGED REM FUSE R - - GROUND +12V BATT 10 - 12V battery head unit to remote turn-on +12V
electrical connections 4 ch amp PB-238GX • PB-638GX • PB-1038GX CH1 + + CH3 CH2 - + BRIDGED - + - + + BRIDGED REM FUSE CH4 - - GROUND +12V BATT - 11 12V battery head unit CH1 + + CH3 CH2 - + BRIDGED - - + + FUSE CH4 - + BRIDGED REM - GROUND +12V BATT to remote turn-on +12V - 12V battery to remote turn-on +12V head unit
stereo input connections using 2 ch amp PB-738GX • PB-1838GX low level inputs 2 CHANNEL MOSFET AMPLIFIER L REMOTE BASS BOOST BASS BOOST LPF HPF PROTECT POWER LEVEL HI IN FREQ. R R 80 Hz 2.
mono input connections using 2 ch amp PB-738GX • PB-1838GX low level inputs 2 CHANNEL MOSFET AMPLIFIER L REMOTE BASS BOOST BASS BOOST LPF HPF PROTECT POWER LEVEL HI IN FREQ. R R 80 Hz 2.
2/4 channel input connections 4 CH input connections using 4 ch amp PB-238GX low level inputs 4 CHANNEL POWER AMPLIFIER LOW IN CH 4 LOW IN CH 3 CH 2 LEVEL HI IN CH4 CH3 CH 1 LEVEL HI IN CH2 CH1 POWER + - - + MAX + - - + MIN MIN MAX L/R FRONT Audio Outputs L/R REAR Audio Outputs low level inputs 4 CHANNEL POWER AMPLIFIER LOW IN CH 4 HI IN LOW IN CH 3 CH 2 LEVEL CH4 CH3 LEVEL + - - + MIN MAX CH 1 HI IN CH2 CH1 POWER + - - + 2 CH input connections using MIN MAX L Y adapt
high level input connections 4 ch amp PB-238GX 4 CH floating ground connections 4 CHANNEL POWER AMPLIFIER LOW IN CH 4 LOW IN CH 3 CH 2 LEVEL HI IN CH4 CH3 CH 1 LEVEL HI IN CH2 CH1 POWER + - - + MAX + - - + MIN MIN MAX 15 4 CH harness wiring for common ground connections CH 3/4 REAR L R L ORANGE R FRONT ORANGE BLACK BLACK BLACK BLACK ORANGE ORANGE from speaker terminals PLEASE NOTE! If using high level inputs, do not use the low level RCA inputs at the same time! CH 1/2 REAR
Stereo input connections 4 ch amp PB-638GX • PB-1038GX low level inputs 4 CH Stereo input connections using CH 4 LEVEL FREQ. BASS BOOST LPF HPF HPF LPF BASS BOOST FREQ. LEVEL CH 2 + - - + + - - + CH4 CH3 HI IN CH 3 MIN MAX HPF LPF FULL 0 +18db 35 Hz 400 80 Hz 2.5k 80 Hz 2.
high level Stereo input connections 4 ch amp PB-638GX • PB-1038GX 4 CH floating ground connections CH 4 LEVEL BASS BOOST FREQ. LPF HPF HPF LPF BASS BOOST FREQ. LEVEL CH 2 + - - + + - - + CH4 CH3 HI IN CH 3 MIN MAX HPF LPF FULL 0 +18db 35 Hz 400 80 Hz 80 2.5k Hz 2.
mono input connections 4 ch amp PB-638GX • PB-1038GX 4 CH mono input connections using CH 4 LEVEL FREQ. BASS BOOST low level inputs LPF HPF HPF LPF BASS BOOST FREQ. LEVEL CH 2 + - - + + - - + CH4 CH3 HI IN CH 3 MIN MAX HPF LPF FULL 0 +18db 35 Hz 400 80 Hz 80 2.5k Hz 2.
high level mono input connections 4 ch amp PB-638GX • PB-1038GX 4 CH Common ground connections CH 4 LEVEL FREQ. BASS BOOST LPF HPF HPF LPF BASS BOOST LEVEL FREQ. CH 2 + - - + + - - + CH4 CH3 HI IN CH 3 MIN MAX HPF LPF FULL 0 +18db 35 Hz CHANNEL 3/4 400 80 Hz 2.5k 80 Hz 2.
speaker connections 2 ch amp • PB-738GX • PB-1838GX Stereo Output Mode L + + + BRIDGED REM FUSE R - GROUND - +12V BATT - 20 LEFT speaker RIGHT speaker L + + + BRIDGED speaker REM FUSE R - - GROUND - MINIMUM SPEAKER IMPEDANCE 4 OHMS! +12V BATT
speaker connections 4 ch amp PB-238GX • PB-638GX • PB-1038GX 4 CH Output Mode CH1 + + CH3 CH2 - + BRIDGED L FRONT speakers - + - + + R +12V BATT GROUND - BRIDGED REM FUSE CH4 - - 21 R REAR speakers L Bridged Dual Mono Output Mode (PB-238GX WITHOUT) CH1 + + CH3 CH2 - + BRIDGED - + - + + BRIDGED GROUND - +12V BATT MINIMUM SPEAKER IMPEDANCE 4 OHMS! - speakers L REM FUSE CH4 - R
speaker connections 4 ch amp PB-638GX • PB-1038GX 2 CH Bridged Output Mode with Subwoofer Output CH1 + + CH3 CH2 - + BRIDGED - + - + + BRIDGED GROUND - L +12V BATT - R SUBWOOFER REM FUSE CH4 - SPEAKERS MINIMUM SPEAKER IMPEDANCE 4 OHMS! 22
mounting and installation mounting Your new Pyramid Royal Blue 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.
protection circuitry troubleshooting The built-in protection circuitry in the Pyramid Royal Blue Series amplifiers will disable the amplifier if it senses an input overload, a speaker short circuit, or extreme temperature conditions. No output. Confirm that all terminal strip connections are secure and tight. 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.
precautions notes STOP 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.
