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4.3 LOUDSPEAKER CONNECTIONS
· In normal operating mode (i.e. one loudspeaker on each individual amplifier channel), the lowest
terminal resistance is 2 ohm per channel.
· In bridging mode (two amplifier outputs combined) the lowest terminal resistance doubles to 4 ohm.
· The impedance in tri-mode may not fall below 2 ohm per channel.
· Never connect the loudspeakers’ minus terminals to the vehicle chassis.
· Never connect the +12 V supply voltage to a loudspeaker output as this would destroy the amplifier
final stage.
If the amplifier is operated with lower terminal resistances or incorrectly used as described above,
both the amplifier and the loudspeakers may be damaged. The warranty becomes void in such
cases.
5. OPERATING ELEMENTS AND IN/OUTPUTS
5.1 SETTING THE INPUT SENSITIVITY
The input sensitivity may be adapted to any car radio or tape deck. Turn the volume control of your radio
to its central position and then adjust the input-level control (4) to produce an average medium volume.
This setting usually provides sufficient power reserves at optimum weighted noise voltage.
ATTENTION: only reproduce loud test noises briefly to prevent damaging the loudspeakers.
5.2 LOW-PASS FILTER WITH ADJUSTABLE CROSS-OVER FREQUENCY
If the amplifier is used as a subwoofer amplifier, set the switch (6) to "LP/BP" and the high-pass control
(5) counter-clockwise to the lowest value of 15 Hz. Set the desired cross-over frequency with the control
(7). This makes the filter adaptable to the installed woofer's sound requirements.
The filter's high edge steepness is responsible for the precision reduction of medium and high frequency
ranges.
5.3 HIGH-PASS FILTER WITH ADJUSTABLE CROSS-OVER FREQUENCY
If the amplifier is to be used as an amplifier for satellite loudspeakers (mid-range/tweeter loudspeakers),
set switch (6) to “HP”. Set the desired cross-over frequency with the control (5). Only the frequencies
above the set cross-over frequency will then be amplified. This effectively minimizes distortions caused
by excessive membrane movement at low frequencies and small satellite loudspeakers without reducing
the bass level.
5.4 BAND-PASS FILTER
If the subwoofer is to be used as a so-called “kick bass ”, the low- and high-pass filters will be used both.
Set switch (6) to “LP/BP”. Set the desired lower limiting frequency (high-pass) with control (5), and the
desired upper limiting frequency (low-pass) using control (7).
5.5 BASS-BOOST
The bass-boost function (8) is used to increase or equalize the lower bass frequencies.
5.6 OUTPUTS FOR CONNECTING ADDITIONAL AMPLIFIERS
The input signal of the LINE INPUT connections CH1 and CH2 is accumulated and forwarded directly to
the OUTPUT (1) jacks. The OUTPUT connections allow the use of a subwoofer amplifier without requiring
additional T-plugs and cables.
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