Audioplex VC75 OPTIMATCH Installation Manual

VC75 OPTIMATCH STEREO VOLUME CONTROL
Attenuator type:
Switch:
Connector:
Power rating:
Core Saturation:
Transformers:
Mounting:
OPTIMATCH(tm):
Installation must be made by qualified service personnel, and must meet all local codes.
OPTIMATCH(tm) is a new concept in self-impedance matching controls. It can be used either as a full range volume control, or
as an impedance matching volume control that can be adjusted to meet the requirements of your installation. One simple adjustment can be
made when the control is connected, and can be changed to accommodate additions to the installation at any time. It is easily retrofitted to
almost any existing system.
1. Make connections by stripping the wire insulation back about 3/16". Twist any loose strands tightly.
2. Insert the wires from the amplifier into the INPUT openings of the connector, hot to hot and ground to
ground, then tighten the screws. Check for any loose strands that might cause a short circuit. Make
sure the metal part of the screw connector engages the bare wire, NOT the insulation.
3. Similarly, connect speaker wires to the control OUTPUT openings and tighten screws.
4. If using the impedance matching feature of the OPTIMATCH(tm) control, set the index following the chart
below. To set, remove knob and loosen nut to reposition index. Make sure index is not between detent
positions and tighten.
5. Install the control in its operating location. (SUGGESTION: Leave control 3 or 4 positions CCW from
maximum before firing up the system for the first time to avoid "blasting" the speakers, while still having
enough sound to observe operation.
IMPEDANCE MULTIPLES
X32
(STEP 7)
X64
(STEP 6)
X128
(STEP 5)
X256
(STEP 4)
X512
(STEP 3)
X1024
(STEP 2)
OFF
(STEP 1)
INSTALLATION MANUAL
TECHNOLOGY
TM

SPECIFICATIONS

Tapped auto transformer.
12 position rotary, make-before-break contacts, low torque specifications for
smooth feel.
Screw-tight type, or removable.
Complies with UL 1492 @ 25 Watts RMS continuous, 35Hz- 20 KHz, 75 Watts
Audio.
Studies reveal that transformer core saturation @ 35 Hz is 25 Watts.
Tri-filar wound for flat response and minimum phase shift, grain-oriented,
-34 dB in 12 steps, 8 steps @ -3 dB each, 1 step @ 4 dB, 1 step @ -6 dB,
last step OFF.
Fits most standard single gang junction boxes.
Will match impedance for almost any situation. Mechanical index permits
presetting load impedance multiplication by X2, X4, X8, X16, X32, X64, etc.,
which can be changed at any time.
INSTALLATION
X16
(STEP 8)
X8
(STEP 9)
DEFAULT
FACTORY
X4
(STEP 10)
SETTING
X2
(STEP 11)
FULL
ON
(STEP 12)
We do not recommend wiring more than 12 Optimatch(tm) controls in parallel (NOTE: Do not
run more than (2)-8 Ohm speakers per channel). In these instances more impedance protection
should be inserted before the volume controls. The OC-12 is a good choice in this case.
#4 Ohm #8 Ohm
Load
Speakers Speakers
(Ohms)
Per Channel Per Channel
2
4.0000
3
2.6667
4
2
2.0000
5
1.6000
6
3
1.3333
7
1.1429
8
4
1.0000
9
0.8889
5 10
0.8000
11
0.7273
12
6
0.6667
Listed
Audio Equipment
P11 CCC 2
94V 0
No. of Available
Tap Setting Steps for
For Matchit(tm)
Optimatch(tm) Controls
X2 11
X4 10
X4 10
X8 9
X8 9
X8 9
X8 9
X16 8
X16 8
X16 8
X16 8
2006 - 3/3/06
revised 8/10/2011