User Manual
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1. J9 Input Balancing Jumper: For many systems you can leave
this jumper in the UNBALANCED posion. In other systems, the
source unit may look for a ground through the RCA connecon to
the amplier and create a ground loop, which in turn can cause
a whine (not the type that comes in a bole) in your system. In
that event, you should set this jumper to BALANCED.
2. J10 PFM Jumper: The PFM (Programmable Frequency Match)
Filter controls the cuto frequency of the subwoofer output. The
PFM is the boom limit for the low pass output and will help
protect your speakers.
3. J11 Front to Sub Jumper: If your source unit has front, rear,
and subwoofer RCA Line Level outputs, connect them to the
corresponding inputs on your DQDX. If your source unit has only
front and rear inputs, just connect these to the front and rear
inputs on the DQDX and switch this “Sub to Front” jumper to the
ON posion. Changing this jumper to ON will route the low pass
signal (as dened by your crossover selecon) to the Sub outputs
of the DQDX.
4. J12GroundIsolaonSelector: Alternator noise may appear
in a system because the source unit and amplier(s) are using
dierent grounding schemes. To help in this situaon, we have
provided alternave grounding connecons. Make sure your sys-
tem is turned OFF before you move these jumpers. We ship them
in the isolated posion, which usually gives the best results.