12
Note: On each clamp every 4Ω loudspeaker impedance results to a resistance of 2Ω. With each 2Ω is there
actually only 1Ω and with each 1Ω only 0.5Ω. This impedance halving effect is arrived at through the
internal parallel connection of the connecting terminals.
Figure 3: Connection of one or two subwoofers. For subwoofers with dual voice coils, one connecting terminal
for each voice coil can be used.
Setting of „Subwoofer“ iPaul DM2000
Low Pass:
The active internal crossover allows only frequencies, depending on the adjustment of the potentiometers „LPF“
(11), of 250 Hz at 24 dB slope per octave, to pass. A low uncoupling frequency (80 Hz / red point) has the
advantage that the subwoofer, generally placed in the vehicle trunk, is no longer indiscernible, but takes its place in
the front of the overall sound.
Bass-Boost:
For vehicles with high sound absorption, bass rendition can be raised from 45 Hz up to +12 dB with the switch
„Bass-Boost“ (9). Adjust the bass rise depending on loudspeaker location and listening tastes. The correct setting is
achieved when the bass rendition has a full, dry sound. Too strong of a bass rise can, with high volumes, lead to an
overload of the subwoofers! A level of +12 dB is equal to 16-times (!) volume load and gives the bass rendition an
unnatural sound.
Subsonic:
The internal subsonic filter frees the subwoofer and amplifier from all frequencies below those set on the
potentiometer „Subsonic“ (14) (15 Hz to 50 Hz with 24 dB slope per octave). Thereby frequencies not
reproducible by the subwoofer are restrained and unnecessary load on the subwoofers and amplifier is prevented.
TIP: Use subsonic with a cut off frequency of 20-30 Hz. This increases the power handling and lifespan of
the amplifiers and subwoofers!
Many subwoofers cannot correctly render frequencies below 30 Hz, producing instead hot air
without volume. The subwoofer should be protected from these frequencies to increase the lifespan of
the subwoofer and amplifier by preventing unnecessary load.
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