IWC-100 IN-WALL

SPEAKER SELECTOR/VOLUME CONTROL:

Your IWC-100 in-wall Speaker Selector-Volume Control is designed to operate with up to 4 pairs of loudspeakers of 4, 8,

and 16 Ohms impedance in any combination. Impedance loading protection for the power amplifier (s) is built-in, and fully

automatic. Four AUDIOPLEX TECHNOLOGY(tm) , 100 Watt OPTIMATCH(TM) attentuators are employed, pre-set so

that the worst-case operating condition (two pairs of 4 Ohm speakers operating simultaneously at maximum volume) will

appear as a 4 Ohm load on the amplifier. Higher impedance speakers and/or lower volume settings of the controls will reflect

a higher impedance to the amplifier, so that cool, safe operation is assured.

The IWC-100 will fit in any standard 2X4 studded wall with 16" centers. The chassis is only 3 3/8" deep allowing ample

IWC-100. There is a level drop of -6 dB to the speakers at maximum volume settings of the IWC-100 controls (at the factory

setting), but this is not a power loss. When all 4 controls are set at maximum volume, and the speakers are 4 Ohms

impedance, the full power of the source amplifier is available, divided equally among each of the 4 speaker pairs.

The IWC-100 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 the 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. Speakers selected for

operation with the A amplifier input will have the same impedance protection as those that may be operating with the B

amplifier. A pair of speakers in operation on either channel will have no effect on any operating on the other.

Frequency response: +0, -1 dB worst case (-6dB tap), +0, -0.2 dB all other taps, 35 Hz-20 KHz. Measured

at full power, 8 Ohm load. Most controls better these specifications.

Transformers: Tri-filar wound for flat response and minimum phase shift, grain-oriented, high silicon

steel laminations.

Attenuation: -34 dB in 12 steps; 8 steps @ -3 dB each, 1 step @ 4 dB, 1 step @ -6 dB, last step OFF.

(This is total range of control. Note that IWC-50 is pre-set 2 position back (-6 dB) leaving a

total attenuation range of 28 dB in 10 positions.)

Mounting: Fits in almost all standard 2X4 studded walls, in a rectangular cut-out 3 1/8" X 14".

The IWC-100 chassis is 3/8" deep from the front panel to the chassis rear. This will fit in any standard studded wall with

chassis during the process.

Remove the connectors by pulling them straight up, perpendicular to the IWC-100 PC board. Before connecting wires,

note that the connector can be plugged in 2 ways, either with the openings to the rear and the wire openings on top. In some

tight installations it may be worthwhile to consider which position is most advantageous before attaching the wires!

Prepare the wire for connection by stripping about 3/16" of insulation. Twist the exposed conductors tightly if necessary.

Tighten the associated screw to hold the wire firmly in place. Check to make sure that connection is made to the exposed

conductor, NOT the insulation! Also inspect adjacent connections to make sure no stray strands are loose to cause possible

short circuits.

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. Remember that the Left and Right

they will be when the installation is complete. The large number of wires involved may make the assembly rather stiff and

pre-forming will reduce strain on the connectors during final installation.

Place wiring diagram in front of you with the back toward the installation opening. You will then be looking down at the

diagram just as the chassis will be when completing the installation. It is then relatively easy to determine the order of the

final connections.

Complete the installation by mating the connectors to the IWC-100 chassis and gently moving it into position in the cut-

out. Secure with whatever fasteners you will be using into the 2x4 studs. The 5/32" diameter mounting holes are intended

for use with #6 size hardware. When mating each connector, make sure the 4 pins connect to the 4 holes, if displaced to

either side, the system will not operate properly.

OPERATION: