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INSTALLATION MANUAL
TECHNOLOGY
INSTALLING AND USING YOUR OPT-4-70 SPEAKER CONTROL
Your OPT-4-70 Speaker Selector-Volume Control is designed to operate with up to 4 pairs of
loudspeakers. It can be used with one or two stereo amplifiers, or with 4 Channels of a surround-sound
type sound system. Each of the 4 output control channels can be individually switched to the amplifier
connected to A AMPLIFIER INPUT, or one connected to the B INPUT (if any). Thus it is convenient to
listen to different program material in different rooms, swap front and rear channels in a surround-sound
system, etc. Both the A and B amplifier inputs are identical, and completely independent of each other.
Other OPT-4 features include power handling capability of up to 25 Watts RMS continuous (72 Watts
audio). The LEFT and RIGHT channels are completely separate to assure safe operation with all types of
amplifiers, including those with "bridging" outputs. The volume attenuators are tapped auto-transformer
type with attenuation of 3 dB/step except for the last 2, which are 4 and 6 dB. These controls do not heat
up in operation, nor do they deteriorate over long time use.
Connections to amplifiers and speakers are illustrated in the back of these instructions. Remember that
the LEFT and RIGHT circuits are separate, so connections must be made correctly or the system will not
operate properly.
Heavy duty screw terminal connections are provided on the rear panel to insure positive, long lasting
connections. They will accept 12 gauge wire easily. To make connections, strip about 3/8" of insulation
from the wire end. Make sure no loose ends stick out to cause problems. Check that the bare wire is
connected to the hole, not the insulation.
If only one amplifier is to be used, connect it to the AMPLIFIER "A" terminals as shown. Make sure
the + and -, and L and R channel connections are correct to avoid unsatisfactory operation or dead
channels. The same precautions should be used when connecting the speakers, crossed channels, polarity,
or grounds will result in improper operation.
Push all ON-OFF switches that will be used in to ON. Initially, best results will probably be obtained
with all AMPLIFIER A-B switches, out at A. Set the volume control for what is likely to be the loudest
location at maximum (fully clockwise), and the rest about halfway down. Turn the HI-FI system on, and
adjust it's volume for normal listening level at the loudest location. Then adjust the volume for the
remaining locations to a satisfactory loudness. If necessary, the same procedure can be repeated for the B
AMPLIFIER channel (if any).
OPERATION:
1999 - 5/25/99
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WARRANTY:
Your AUDIOPLEX TECHNOLOGY OPT-4-70 Speaker Selector is covered by a LIFETIME warranty
against any defects in workmanship and materials. Any defects will be remedied without charge for labor
or parts.
Damage incurred by shipping or accident is not considered to be a defect, and not covered by this
warranty. AUDIOPLEX TECHNOLOGY, is not responsible for defective operation caused by abuse or
by modification or service by any unauthorized person or agency.
The unit must be properly installed and operated according to instructions for the warranty to apply.
Any necessary servicing must be done by AUDIOPLEX TECHNOLOGY. The product must be returned
expenses prepaid, with written authorization from the company. The product must be shipped with the
proof of purchase and in the original carton and packing material to avoid damage. This warranty gives
you specific legal rights. You may have other rights which vary from state to state.
WIRING DIAGRAM
INPUT A
AMPLIFIER A
STEP DOWN
X-FORMER
AMPLIFIER B
OUTPUT OUTPUT OUTPUT OUTPUT
L+ L- R- R+ L+ L- R- R+ L+ L- R- R+ L+ L- R- R+ L+ L- R- R+ L+ L- R- R+
STEP DOWN
X-FORMER
STEP DOWN
X-FORMER
+R - +R -+R - +R -
-L+ -L+-L+ -L+
STEP DOWN
X-FORMER
STEP DOWN
X-FORMER
INPUT B
STEP DOWN
X-FORMER
STEP DOWN
X-FORMER
STEP DOWN
X-FORMER
SPKR. PAIR 4 SPKR. PAIR 2SPKR. PAIR 3 SPKR. PAIR 1
AUDIOPLEX TECHNOLOGY
404 GWH, P.O. BOX 440
MELVIN VILLAGE, N.H. 03850
1-800-257-2077 IN N.H. 1-603-544-8601
FAX: 1-603-544-8901
1999 - 5/25/99
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