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DETERMINING THE PROPER JUMPER SETTING FOR
The jumper must be set in a position that correctly multiplies the impedance of the system
to a level that is equal to or greater than the impedance of the amplifier. The jumper set-
ting can be determined using the following simple steps
1. Determine the amplifier's minimum impedance. The amplifier's minimum impedance
is usually found following Wattage and Frequency Response in the amplifier's specifica-
tion page of the manual. It may also be listed on the back panel of the amplifier near
the speaker terminals. AC impedance is measured in ohms.
2. Identify the correct impedance-matching chart according to the amplifier's minimum
impedance. There are two impedance matching charts, one for 8 ohm amplifiers and
one for 4 ohm amplifiers. Choose the chart that describes your amplifier. If your ampli-
fier is 6 ohm stable, use the 8 ohm chart.
3. Determine the impedance for each pair of speakers by referring to its manual.
4. Determine the total number of 4 ohm pairs of speakers. (rows on charts)
4
Russound UltraMatch™ volume controls eliminate the
need for a speaker selector. By determining the drive capa-
bility of the amplifier with a few simple calculations, we
can determine the number of speakers the system can
8 X
4 X
1 X - 2
X
2 X - 4
X - 8 X
1 X
8 X
4 X
1 X - 2
X
2 X - 4
X - 8 X
1 X
IMPEDANCE MATCHING
ULTRAMATCH™ VOLUME CONTROLS
safely operate.
Fig 1
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