Avalon Acoustics Sentinel - Manual (Page 30)

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4.5 Connecting Preamplifier to the Amplifiers
The Sentinel subwoofer section is actively powered by its own subwoofer
amplifier, whereas the upper speaker section is powered by your own
amplifier that is directly connected to the Sentinel crossover cabinet.
Therefore, you will need to make two separate output connections from your
preamplifier. This is accomplished in one of the following three methods:
1. Interconnect Y-cable at the preamplifier
A high-quality interconnect Y-cable may be the method with the least
amount of signal loss. Simply connect Y-cables directly at the preamplifier's
left and right channel outputs to divide the signals, resulting in two left
channel outputs and two right channel outputs. Then route one set of
divided outputs (right and left channel) to the subwoofer amplifier, and the
other set (right and left channel) to your own amplifier.
2. Two outputs at the preamplifier
Some preamplifiers are equipped with two sets of outputs. In this case, you
may simply connect one set of outputs (right and left channel) to the
subwoofer amplifier, and the other set of outputs (right and left channel) to
your own amplifier. If the preamplifier inverts the phase of one of the outputs,
be sure to compensate by reversing the polarity of the speaker leads at the
corresponding amplifier's output terminals.
IMPORTANT: Correct polarity of connections is critical to performance. Check
to insure that the polarity is correct at the amplifier and crossover cabinet
terminals.
3. Loop-Out from the Subwoofer Amplifier
The Sentinel Subwoofer amplifier is also equipped with loop-output
connectors that bypass the amplifier's circuitry. Utilizing this feature, you may
connect directly from these subwoofer amplifier loop-outputs to the inputs of
your own amplifier.
WARNING: Failure to follow the set-up and wiring instructions explicitly may
cause damage to your loudspeakers and void your warranty.