Rainbow Germanium Four Einbauanleitung Seite 35

Figure 5: Frequency Response of High-pass REAR Operation Mode:
Operation Mode: Lowpass REAR
This mode of operation is used exclusively when the amplifier is assigned to subwoofer mode. The internal active
crossover allows only frequencies under the cut-off frequency of 12 dB slope per octave to pass. A low decoupling
frequency of <100 Hz has the advantage that a subwoofer, which is usually installed in the trunk, no longer stands
out, but rather blends into the complete sound picture.
• Set switch "X-OVER" (10) to „BP/LPF" and, using the potentiometer, adjust the cut off frequency „LPF" (17)
to between 50 Hz – 5 kHz for the REAR channels. Set potentiometer "HPF" (18) all the way left to 15 Hz!
Adjust level of subwoofer with controller „GAIN" (15)
The phase position of the subwoofers should be checked against the basis system after start-up of the complete
system. The phase position is correct when the deep bass rendition is short and dry. Spongy and weak deep bass
rendition indicates phase errors. The phase position of the subwoofers can be changed by adjusting the
potentiometer „PHASE" (19). Adjust settings on the „PHASE"-controller (19) until the bass rendition is optimal.
Caution: The phase shifter functions only when the switch"X-OVER" (10) is in the „BPF/LPF" position and
affects only the REAR channels.
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