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Manafacture: Pyramid Car Audio File size: 889.71 kb File name: Language of manual:

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. 4 ch amp PB681X • PB881X PB681X PB881X output power @ 14.4v DC, 1KHz RMS Power @ 4 Ohms 35 Watts x 4 50 Watts x 4 RMS Power @ 2 Ohms 55 Watts x 4 60 Watts x 4 Maximum Power Output 250 Watts x 4 300 Watts x 4 frequency response 15 Hz-30 KHz input impedance low level inputs high level inputs 10K Ohms 100 Ohms input sensitivity low level inputs high level inputs 250mV 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 20 A 30 A dimensions (W x H x L) mm 276 x 60 x 305 276 x 60 x 394 inches 10.9 x 2.4 x 12 10.9 x 2.4 x 15.5 11 pb1881X features and controls 4 ch amp PB 1881 X 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 Remote Bass Boost ch 1/2 input level control ch 1/2 high level inputs ch 1/2 low level inputs ch 1/2 crossover mode selector switch ch 1/2 bass boost level control 12 ch 1/2 low pass frequency control ch 1/2 high pass frequency control power terminals speaker connections power fuse features and specifications 4 ch amp PB1881X dual crossover mode selectors when used with normal, full range systems, set these switches to “FULL.” PB1881X If you wish to use the internal crossovers to power a driver of specific frequency range, use the “LOWPASS” or “HIGHPASS” settings. output power @ 14.4v DC, 1KHz RMS Power @ 4 Ohms 75 Watts x 4 dual 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 RMS Power @ 2 Ohms 120 Watts x 4 the amp level controls until distortion begins to occur, and reduce slightly Maximum Power Output 450 Watts x 4 from this point. frequency response 15 Hz-30 KHz dual 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 input impedance the speakers. low level inputs 10K Ohms dual high pass frequency controls when the one or both of crossover selector switch is in “high pass” mode, high level inputs 100 Ohms one can set the lower frequency limit for audio program sent to the speakers. input sensitivity CH 3/4 Remote Bass Boost Plug in the Remote Bass Boost Control wire in here. low level inputs 250mV high level inputs 2.5V dual 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. power supply voltage 14.4V DC Neg. Ground (10.5-16V) 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. matching speaker impedance stereo mode 2-4 Ohms high level inputs if your car stereo lacks RCA-type output jacks, you may connect speaker output leads to these input connectors. bridged mode 4-8 Ohms power LED this indicator is illuminated when power is applied. maximum current draw 40 A protection LED this indicator is illuminated when built-in protection circuitry is activated. dimensions (W x H x L) power fuse the fuse protects the amplifier and your car’s electrical system from short mm 276 x 60 x 432 circuit conditions. inches 10.9 x 2.4 x 17 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. GROUND +12V BATT REM FUSEL R BRIDGED + --+ -+ to remote turn-on +12V head unit 12V battery 14 electrical connections 2 ch amp PB481X • PB781X • PB1281X pb481X pb781X pb1281X to remote turn-on +12V head unit 12V battery CH3 CH4 GROUND +12V BATT REM BRIDGED FUSE BRIDGED + --+-+-+ -+-+ CH1 CH2 to remote turn-on +12V head unit 12V battery REM CH3 CH4 GROUND +12V BATT BRIDGED FUSE BRIDGED + --+-+-+ -+-+ CH1 CH2 15 electrical connections 4 ch amp PB681X • PB881X • PB1881X pb681X pb881X pb1881X head unit L/R Audio Outputs from speaker terminals L L RR 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 connections2 ch amp PB481X • PB781X • PB1281X pb481X pb781X pb1281X using low level inputs 16 stereo input connections2 ch amp PB481X • PB781X • PB1281X pb4...

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