VTL S-400 II series Owner's Manual page 16

Step 2: Connect the Amplifiers to the Loudspeakers
Connect the loudspeaker cable from each speaker to the rear 5-way speaker binding post on the corresponding
amplifier. Use a 7/16" wrench to tighten the binding post nut, taking care not to over-tighten the binding post. Check
to make sure that the connections from the speakers to the amplifier's binding post are correct: + (or red) to + and -
(or black) to –
Warning: The S-400 Series II Amplifier is a fully balanced design with a balanced output.
Care should be taken so that neither output is ever grounded.
Warning: Do not connect a sub-woofer to the output of the amplifier unless you are sure
Please consult your authorized VTL dealer or the VTL factory customer support department if you have any
questions on the fully balanced connection of the amplifier.
Step 3: Connect the Preamplifier to the Amplifier
Make sure all units are turned OFF, connect the preamplifier's output to the amplifier's input, matching the left and
right channels. If your preamplifier supports balanced output and you have balanced interconnects, connect the
preamplifier's balanced output to the power amplifier's balanced input, with the right channel output from the
preamplifier going to the input of the right amplifier, and similarly the left channel output of the preamplifier to the
input of the left amplifier.
S-400 Amplifier Owner's Manual
VTL
that the subwoofer input is fully balanced and that neither phase can become
grounded.
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