User's Manual

ManualsBrandsKnoll Systems ManualsSpeakersKnoll Systems Knoll Systems Speaker VC100IM

Setting the impedance matching jumpers:

Each of the VC100im volume controls needs to have the jumpers

correctly set. The two jumpers are located on the rear side of the

volume control. Both channels on all volume controls in this system

should be set to the same jumper setting.

The jumper setting is determined by three factors:

1. The speaker impedance (all the speakers in

this system should have the same

impedance).

2. The number of volume controls connected

to one stereo amplifier.

3. The minimum speaker load impedance the

amplifier can handle.

In the illustration both jumpers are shown set in

the X4 position. Ideally, all volume controls in

this system should have their jumpers set to

the same correct position. 4 and 8 ohm

speakers can safely be combined in a system. Use

the 4 ohm settings. The jumper needs to be

pushed on as far as it goes.

To determine the correct jumper or shunt position, use the

chart below.

Jumper setting X1 X2

4 Ohm speakers

8 Ohm speakers

don’t

1 pair

2 pair

4 pair

1 pair

2 pair

4 pair

8 pair

When using amps or receivers with 8 ohm capacity

Jumper setting X1 X2

4 Ohm speakers

8 Ohm speakers

1 pair

2 pair

4 pair

2 pair 4 pair 8 pair

When using amps or receivers with 4 ohm capacity

8 pair

16 pair

As an example, if the amplifier has 4-ohm capability with 7 pairs of 8

ohm speakers to be installed, set all VC100im jumpers to X4.

Connection and trim-out: Remove about ¼” of insulation from the

ends of all wires connected to the volume control and twist the

exposed strands. The stereo amplifier or receiver outputs (left and

right) are connected to the VC100im top connector labeled “INPUT”.

Be very careful to observe the correct polarity. The VC100im uses

independent floating grounds so bridged amplifiers can be used safely.

The VC100im is rated for use with maximum

100 watt per channel amplifiers. DO NOT use

higher-powered amplifiers with this product

for safety reasons.

Wire from the amplifier speaker terminals is always wired in parallel to

all VC100im volume controls. To make the installation look neat and

tidy, we suggest using one or more WT6 connection strips. When

connecting to the amp make sure its power is switched off. Again

strictly observe wiring polarity.

Connect the four position connectors labeled “OUTPUT” to the stereo

speakers they will control. Again series and parallel speaker wiring is

acceptable so that the impedance the volume control sees is between

4 and 8 ohms. Be sure to strictly observe polarity, as incorrect polarity

will result in poor bass performance.

When installing the volume control into the wall, we suggest moving

any inside wall fixtures such as vapor barriers away from the

autotransformers if possible.