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If you ever encounter problems from your subwoofer there are a number
of factors that could be involved.
1. If the subwoofer has a noticeably higher noise floor compared to
your other speakers, it is likely that the cable run between the
preamp/processor and subwoofer (or between the amplifier and the
subwoofer) is too long. Typically, you want to use a length of less
than 3 meters if using the low-level inputs and a length of less than
15 meters if using high level inputs.
2. If you are using the high level inputs and you notice a “hum” from
the subwoofer while all of your other audio equipment is turned off,
it is likely that the subwoofer is still on and the inputs to the
subwoofer are creating an “antenna” effect and picking up noise.
The best way to eliminate this problem is to turn off the subwoofer
when you turn off the rest of your equipment.
3. Failure to mute the front panel switch can lead to a loud thump
when rear panel rocker is switched.
