Induction Dynamics SW1 - Manual (Page 10)

4. Special High-Level Stereo Connection - preamp or receiver without sub output
The high-level method is recommended for setups where the receiver is a long distance from
the main left and right speakers and subwoofer.
Connect the L and R speaker leads from the main amp directly to the high-level terminals
marked FROM AMPLIFIER on the A3 amp. Then connect a second pair of speaker leads
to your L and R main speakers. The high-level terminals are capable of connecting leads
terminated with either bare wire ends or “banana” plugs. If your leads have “banana” plugs
on them, the plastic decorative plugs may be removed from the high-level terminals on the
A3 amplifier. When using the high-level terminals, be sure to verify the positive leads are
connected to the red terminals and the negative leads are connected ot the black terminals
on all connections. In this configuration you will use the low-pass crossover in the A3
amplifier, so the low-pass switch on the A3 amp should be in the “in” position. Proceed to
step 5.
5. Connect the amplifier to a 120-volt, single phase, 60-Hz, grounded power supply
using the power cord provided. For best results, use a dedicated power circuit for your
amplification equipment.
6. If you used connection method 3 or 4, you will need to adjust the low pass. Initially, set
the low pass at the lowest frequency specified by the manufacturer for the main speakers.
For example, if the frequency response of your mains is specified as 55-20,000 Hz, set the
low pass at 55 Hz. Later, after setting volume level and checking phase, you can fine tune
the low pass setting.
7. Due to varying processor designs and possible phase switches, it is best to check the
phase of your SW1 for proper alignment. Your SW1 with built-in A3 amplifier has a phase
switch on the back panel. To test for proper phase, play some music that has some low-
frequency sound. Listen to the subwoofer and higher frequency speakers together. With
an assistant manning the phase switch, listen to the frequencies slightly above the lowest
frequencies (at crossover), asking the assistant to switch between the two positions. One
of these two positions will sound noticeably louder in the crossover frequency range. The
louder position is the proper phase alignment for your installation.
8. You can adjust the subwoofer level using the gain control on the back of the A3 amplifier.
The gain control is precisely stepped in 1/2 dB increments, allowing settings for various
applications to be easily repeated. For flexibility, a 3-position switch is provided which
allows the selection of additional gains of +10, 0, -10 dB; these gain controls are in addition
to the control in the menu of the audio/video preamplifier or receiver.
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