4-Channel Amplifiers; Features And Operational Controls - Autotek A 2150 Benutzerhandbuch

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The LINE INPUT RCA jacks must be connected with the RCA output jacks of the headunit.
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By connecting only the CH1/2 jacks, the INPUT MODE switch must be set to the 2CH position.
The High Level Inputs are suitable to connect the amplifier inputs with speaker wires, if your headunit is not equipped with pre-
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amplifier RCA outputs. Never use the High Level Inputs and the RCA inputs at the same time. This may damage the amplifier
seriously. Attend therefor the descriptions on page 28.
The LEVEL INPUT CH1/2 and CH3/4 controllers adjust the input sensitivity of the amplifier to align the audio signal of the head
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unit for the regarding channel pair (Channel 1/2 or Channel 3/4). The input sensitivity is adjustable from 4 to 0.2 Volts.
The BASS BOOST CH1/2 and CH3/4 controllers adjust the bass boost enhancement continuously from 0dB to +12dB at
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45 Hz for the regarding channel pair (Channel 1/2 or Channel 3/4).
The HIGH PASS CH1/2 and CH3/4 controllers adjust the cut-off point of the frequency range to below for the regarding channel
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pair (Channel 1/2 or Channel 3/4). The cut-off frequency is continuously adjustable from 60 Hz to 1200 Hz (1.2 kHz).
The LOW PASS CH1/2 and CH3/4 controllers adjust the cut-off point of the frequency range to above for the regarding
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channel pair (Channel 1/2 or Channel 3/4). The cut-off frequency is continuously adjustable from 30 Hz to 250 Hz.
The CH1/2 and CH3/4 X-OVER switch selects the required operation mode of the amplifier on the regarding channel pair
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(Channel 1/2 or Channel 3/4).
Position LP: Lowpass mode (The higher frequencies will be eliminated. Adjustable by the lowpass controller.)
Position HP: Highpass mode (The higher frequencies will be eliminated. Adjustable by the highpass controller.)
Position FULL: Fullrange mode (The whole frequencies will be amplified).
The INPUT MODE switch must be in 2CH position, if you connect only one RCA stereo audio cable with the CH1/2 line inputs.
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Select the position 4CH, if you connect two RCA stereo audio cables with CH1/2 and CH3/4 line inputs.
The fader function of your headunit works only in the 4CH mode.
If you have select the 2CH mode, the input signal of LINE INPUT CH1/2 will be routed to the channelpair CH3/4. Due to this, only
one RCA stereo audio cable is required. Therefor the additional available subwoofer lineout (SUB OUT) of your headunit is
recommended in the LP mode and no Y-Adaptors are required.
Choose the 3CH mode only if you run a subwoofer in bridge mode on Channel 1 and 2. Thereby the signal on Channel 1 and 2
will be summed to a mono signal.
The LINE OUT RCA jacks provide a linear fullrange audiosignal to supply an additional amplifier.
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POWER/PROTECT (This LEDs are located on the opposite panel next to the fuse)
If the POWER LED lights up, the amplifier is ready for operation.
If the PROTECT LED lights up, a malfunction is indicated. Attend in this case the chapter TROUBLE SHOOTING.
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FUNCTIONS AND OPERATIONAL CONTROLS
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