JAMO JSS4-VC2 Benutzerhandbuch - Seite 2

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Introduction

Your JSS4-VC2 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. 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 INPUT,

or one connected to the B INPUT. Thus it is convenient to listen to different program material

in different rooms, swap front and rear channels in a surround-sound system, etc.

Impedance loading protection for the power amplifier (s) is built-in, and fully automatic. Four

100 Watt AUTOMATCH attenuators are employed, pre-set so that the worst-case operating

condition (four 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 safe operation

is assured.

Since impedance matching protection is achieved by use of AUTOMATCH transformers, there

is no heat generated in the matching process- this assures safe operation in a closed

environment. There are no extra buttons to operate that must be remembered to maintain

safe operation. An additional advantage is that there is no power loss in the JSS4-VC2. There is

a level drop of -6 dB to the speakers at maximum volume settings of the JSS4-VC2 controls (at

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

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

pairs.

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. The number of pairs of speakers

in operation on either channel will have no effect on any operating on the other.

Other JSS4-VC2 features include power handling capability of up to 100 Watts RMS continuous

at 8 Ohms in any switching mode. The LEFT and RIGHT channels are completely separate

to assure safe operation with alt 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.

Connecting

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 push-to-open connections are provided on the rear panel to insure positive, long

lasting, connections. To make connections, strip about 3/8" of insulation from the wire end.

Push the connector tab toward the rear panel to open the hole. Insert the stripped wire end

into the opening , and release the tab. Make sure no loose ends stick out to cause problems.

Check that the bare wire, not the insulation, is connected to the hole.

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.