Legacy Audio Xtreme XD - Manual (Page 12)

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Option 2: Connecting the Xtreme HD using the stereo Low Level
preamp/processor inputs.
NOTE: if using the low-level inputs, we suggest using cables that are no
longer than 5 meters. Longer lengths of RCA cable can result in greater
noise and attenuation of the signal.
If using Left/Right output jacks from the preamp, the internal circuit module
of the Xtreme HD will sum the two channels together. When using the left
and right low level inputs on the subwoofer, the internal crossover of the
subwoofer is being used. The crossover frequency and level will be
controlled by the appropriately labeled controls on the front panel of the
sub.
Option 3: Connecting single sub out
Connect the preamp/processor’s “sub out” to the left channel RCA input
(mono).
Speaker Connections