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Pyramid PB1281X - page 1
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, P ...
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Pyramid PB1281X - page 2
table of contents 1 mounting and installation 25 protection circuitry and troubleshooting 26 19 20 22 23-24 21 speaker connections PB681X/PB881X/PB1881X speaker connections PB481X/PB781X/PB1281X high level mono input connections PB681X/PB881X/PB1881X mono input connections PB681X/PB881X/PB1881X high level input connections PB681X/PB881X/PB1881X ele ...
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Pyramid PB1281X - page 3
general features 2 · 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 T urn On/Off · Gold Plated RCA Inputs · High Level MOLEX Input · Power ON LED Indicator · LED Protection Indicator · S/N Ratio: &g ...
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Pyramid PB1281X - page 4
general features 3 · 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 T urn On/Off · Gold Plated RCA Inputs · High Level MOLEX Inputs · Power ON LED Indicator · LED Protectio ...
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Pyramid PB1281X - page 5
high level inputs input level control crossover mode selector protection LED low pass frequency control bass boost level low level inputs power LED high pass frequency control speaker connections power terminals power fuse 4 pb481X features and controls 2 ch amp PB 481X ...
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Pyramid PB1281X - page 6
frequency response power supply voltage output power @ 14.4v DC, 1KHz RMS Power @ 4 Ohms RMS Power @ 2 Ohms Maximum Power Output input sensitivity low level inputs high level inputs 40 Watts x 2 60 Watts x 2 300 Watts x 2 15 Hz-30 KHz 250mV 2.5V 14.4V DC Neg. Ground (10.5-16V) crossover mode selector input level control low pass frequency control h ...
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Pyramid PB1281X - page 7
high level inputs input level control crossover mode selector protection LED low pass frequency control bass boost level low level inputs power LED high pass frequency control speaker connections power terminals power fuse 6 pb781X features and controls 2 ch amp P B781X ...
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Pyramid PB1281X - page 8
7 features and specifications 2 ch amp P B781X 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. ...
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Pyramid PB1281X - page 9
speaker connections power terminals power fuse Remote Bass Boost 8 pb1281X features and controls 2 ch amp PB 1 2 8 1 X high level inputs input level control crossover mode selector protection LED low pass frequency control bass boost level low level inputs power LED high pass frequency control ...
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Pyramid PB1281X - page 10
frequency response power supply voltage output power @ 14.4v DC, 1KHz RMS Power @ 4 Ohms RMS Power @ 2 Ohms Maximum Power Output input sensitivity low level inputs high level inputs 75 Watts x 2 120 Watts x 2 800 Watts x 2 15 Hz-30 KHz 250mV 2.5V 14.4V DC Neg. Ground (10.5-16V) maximum current draw dimensions (W x H x L) mm inches 2-4 Ohms 4-8 Ohms ...
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Pyramid PB1281X - page 11
10 pb681X pb881X features and controls 4 ch amp PB 6 8 1X • PB881X protection LED power LED ch 3/4 low level inputs ch 3/4 high level inputs ch 3/4 bass boost level control ch 3/4 low pass frequency control ch 3/4 high pass frequency control ch 3/4 crossover mode selector switch ch 3/4 input level control ch 1/2 low level inputs ch 1/2 high level ...
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Pyramid PB1281X - page 12
PB 681X frequency response power supply voltage output power @ 14.4v DC, 1KHz RMS Power @ 4 Ohms RMS Power @ 2 Ohms Maximum Power Output input sensitivity low level inputs high level inputs 35 Watts x 4 55 Watts x 4 250 Watts x 4 1 5 Hz-30 KHz 250mV 2.5V 14.4V DC Neg. Ground (10.5-16V) PB 881X 50 Watts x 4 60 Watts x 4 300 Watts x 4 maximum current ...
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Pyramid PB1281X - page 13
12 pb1881X features and controls 4 ch amp PB 1881 X protection LED power LED speaker connections power terminals power fuse ch 1/2 low level inputs ch 1/2 high level inputs ch 3/4 low level inputs ch 3/4 high level inputs Remote Bass Boost ch 1/2 input level control ch 1/2 bass boost level control ch 1/2 low pass frequency control ch 1/2 high pass ...
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Pyramid PB1281X - page 14
dual crossover mode selectors dual input level controls dual low pass frequency controls dual high pass frequency controls dual bass boost level controls low level inputs high level inputs power LED protection LED power fuse power terminals speaker connections when used with normal, full range systems, set these switches t o “ FULL. ” If you wi ...
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Pyramid PB1281X - page 15
GROUND +12V BA TT REM FUSE L R BRIDGED + - - + - + to remote turn-on +12V head unit 12V battery 14 electrical connections 2 ch amp PB481X • PB781X • PB1281X pb481X pb 781X pb1281X ...
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Pyramid PB1281X - page 16
to remote turn-on +12V head unit 12V battery CH3 CH4 GROUND +12V BA TT REM BRIDGED FUSE BRIDGED + - - + - + - + - + - + CH1 CH2 to remote turn-on +12V head unit 12V battery REM CH3 CH4 GROUND +12V BA TT BRIDGED FUSE BRIDGED + - - + - + - + - + - + CH1 CH2 15 electrical connections 4 ch amp PB681X • PB881X • PB1881X pb681X pb881X pb1881X ...
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Pyramid PB1281X - page 17
head unit L/R Audio Outputs from speaker terminals LL R R using high level inputs head unit wiring harness PLEASE NOTE! If using high level inputs, do not use the low level RCA inputs at the same time! 16 stereo input connections 2 ch amp PB481X • PB781X • PB1281X pb481X pb 781X pb1281X using low level inputs ...
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Pyramid PB1281X - page 18
head unit using low level inputs PLEASE NOTE! If using high level inputs, do not use the low level RCA inputs at the same time! using high level inputs T o a second amplifier Y Adaptors 17 mono input connections 2 ch amp PB481X • PB781X • PB1281X pb481X pb 781X pb1281X head unit wiring harness wiring harness T o a second amplifier R R L L from ...
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Pyramid PB1281X - page 19
4 CH input connections using low level inputs 2 CH input connections using low level inputs Y adaptors R L FREQ. CH 3 LOW IN LEVEL MIN MAX CH 4 HPF +18db 0 35 400 Hz LPF 80 HPF 2.5k 2.5k Hz +18db 0 BASS BOOST MIN MAX FREQ. CH 1 CH 2 80 Hz 35 400 Hz LPF HI IN CH4 CH3 + - - + HI IN CH2 CH1 + - - + LOW IN BASS BOOST LEVEL FULL HPF LPF FULL HPF LPF POW ...
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Pyramid PB1281X - page 20
FREQ. CH 3 LOW IN LEVEL MIN MAX CH 4 HPF +18db 0 35 400 Hz LPF 80 HPF 2.5k 2.5k Hz +18db 0 BASS BOOST MIN MAX FREQ. CH 1 CH 2 80 Hz 35 400 Hz LPF HI IN CH4 CH3 + - - + HI IN CH2 CH1 + - - + LOW IN BASS BOOST LEVEL FULL HPF LPF FULL HPF LPF POWER PROTECT REMOTE BASS BOOST(CH3/4) 4 CH floating ground connections from speaker terminals L R FRONT LR RE ...
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Pyramid PB1281X - page 21
RIGHT FRONT Audio Outputs LEFT FRONT Audio Outputs 4 CH mono input connections using low level inputs 2 CH mono input connections using low level inputs Y adaptors L R FREQ. CH 3 LOW IN LEVEL MIN MAX CH 4 HPF +18db 0 35 400 Hz LPF 80 HPF 2.5k 2.5k Hz +18db 0 BASS BOOST MIN MAX FREQ. CH 1 CH 2 80 Hz 35 400 Hz LPF HI IN CH4 CH3 + - - + HI IN CH2 CH1 ...
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Pyramid PB1281X - page 22
4 CH floating ground connections 4 CH harness wiring for common ground connections from speaker terminals PLEASE NOTE! If using high level inputs, do not use the low level RCA inputs at the same time! RL ORANGE ORANGE ORANGE ORANGE BLACK BLACK BLACK BLACK FREQ. CH 3 LOW IN LEVEL MIN MAX CH 4 HPF +18db 0 35 400 Hz LPF 80 HPF 2.5k 2.5k Hz +18db 0 BAS ...
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Pyramid PB1281X - page 23
Stereo Output Mode Bridged Mono Output Mode speaker MINIMUM SPEAKER IMPEDANCE 4 OHMS! 22 speaker connections 2 ch amp PB481X • PB781X • PB1281X pb481X pb 781X pb1281X RIGHT speaker LEFT speaker ...
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Pyramid PB1281X - page 24
4 CH Output Mode Bridged Dual Mono Output Mode REM CH3 CH4 GROUND +12V BATT BRIDGED FUSE BRIDGED + - - + - + - + - + - + CH1 CH2 CH3 CH4 GROUND +12V BATT REM BRIDGED FUSE BRIDGED + - - + - + - + - + - + CH1 CH2 REAR speakers FRONT speakers LR RL pb681X pb881X pb1881X speaker connections 4 ch amp PB681X • PB881X • PB1881X 23 MINIMUM SPEAKER IMPE ...
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Pyramid PB1281X - page 25
2 CH Bridged Output Mode with Subwoofer Output pb681X pb881X pb1881X speaker connections 4 ch amp PB681X • PB881X • PB1881X 24 MINIMUM SPEAKER IMPEDANCE 4 OHMS! SPEAKERS R L SUBWOOFER REM CH3 CH4 GROUND +12V BA TT BRIDGED FUSE BRIDGED + - - + - + - + - + - + CH1 CH2 ...
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Pyramid PB1281X - page 26
mounting and installation 25 f uses wiring tips When making electrical connections to your amplifier , please observe the following: Use at least 8 gauge wire for power and ground connections. Wire the amplifier directly to the car battery . For the ground connection, use the shortest possible wire to a good chassis ground point. Wire the Remote co ...
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Pyramid PB1281X - page 27
The built-in protection circuitry in the Pyramid Crystal amplifiers will disable the amplifier if it senses an input overload, a speaker short circuit, or extreme temperature conditions. When the protection circuit is activated by any of these conditions, the Protection LED will be illuminated. If this occurs, carefully inspect the system to determ ...
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Pyramid PB1281X - page 28
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 ...
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