Induction Dynamics SW4.iw, Owner'S Manual

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11
Installing the SW4.iw
With A2 Amplifier
The A2 is designed to be used with audio/video pre-amplifiers and receivers that have their
own built-in low frequency crossover circuits. These circuits typically have a low pass rolloff
of 12dB/octave or 24 dB/octave. The best crossover frequency setting is usually 60 Hz (12
dB/octave low pass) or 70 Hz (24 db/octave low pass). Ultimately, the crossover frequency
setting is best determined by consulting your own ears.
Connecting the A2 to Your SW4.iw
1. Turn off the power to each piece of equipment before making any connections.
2. Using high-quality interconnect cables with RCA type terminations, connect the
“SUBWOOFER OUT” on the audio/video preamplifier or receiver to “IN” on the A2. If using
a single subwoofer, proceed to step 3; if using two subwoofers, skip step 3 and proceed to
step 4.
3. Using high-quality speaker wire (consult the chart on page 4), connect the black binding
post on the A2 to the black binding post on the SW4.iw subwoofer and connect the red
binding post on the A2 to the red binding post on the SW4.iw subwoofer. Proceed to step 5.
4. If using a single A2 with two subwoofers, the subs must be connected in series. In this
configuration, the two 4-ohm loads will combine to create an 8-ohm load. Connect the red
binding post of the A2 amplifier to the red binding post on the first subwoofer, and the black
binding post on the A2 amplifier to the black binding post on the second subwoofer. Then
connect the black binding post on first subwoofer to the red binding post on the second
subwoofer. Three subwoofer connection methods are shown on the opposite page. 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. Phase Check: Listen to the subwoofer(s) and higher frequency speakers together. Then,
reverse the speaker wires on the back of the subwoofer (black to red and red to black).
This reverse connection is 180
º
out of phase with the normal connection. One of these
two arrangements will sound noticeably louder in the low-frequency range. The louder
arrangement is the proper phase alignment for your installation.