Knoll Systems VS150IM warranty VS150im

Setting the impedance matching jumpers:

Each of the VS150im 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:		8X
1.	The speaker impedance (all the speakers in	4X
	this system should have the same
	impedance).	2X
2.	The number of volume controls connected to	1X

one stereo amplifier.

3.The minimum speaker load impedance the amplifier can handle.

In the left illustration both jumpers are shown set in	8X
	4X
the X1 position. The top jumper set is for the left

speaker and the bottom set is for the right speaker.
Ideally, all volume controls in this system	2X
should have their jumpers set to the same
	1X
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.

When using amps or receivers with 8 ohm capacity

Jumper setting	X1	X2	X4	X8
4 Ohm speakers	don’t	1 pair	2 pair	3-4 pair
8 Ohm speakers	1 pair	2 pair	3-4 pair	5-8 pair

When using amps or receivers with 4 ohm capacity

Jumper setting	X1	X2	X4	X8
4 Ohm speakers	1 pair	2 pair	3-4 pair	5-8 pair
8 Ohm speakers	2 pair	3-4 pair	5-8 pair	9-16 pr

As an example, if the amplifier has 4-ohm capability with 7 pairs of 8 ohm speakers to be installed, set all VS150im jumpers to X4.

Connection and trim-out:Remove the eight position speaker connector. 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 VS150im connector portion labeled “INPUT” on the volume control. Be very careful to observe the correct polarity. The VS150im uses independent floating grounds so bridged amplifiers can be used safely.

Warning: The VS150im is rated for use with maximum 150-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 VS150im 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 wires		Plastic
from the stereo				VS150im
			Plate
speakers to the
connector portion
labeled “OUTPUT” on
the volume control.
Again series and
parallel speaker	Knob
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.					bottom tab
			Control
					Metal plate
			shaft

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.