4
Russound ALT-126R Installation Manual
IMPEDANCE MATCHING
Amplifi er impedance
- Determine the amplifi er's minimum impedance. The amplifi er's minimum
impedance is measured in ohms (4, 6 or 8 ohms) and can be found in the amplifi er's manual. It may
also be listed on the back panel of the amplifi er near the speaker terminals.
Speaker impedance
- Determine the impedance for each pair of speakers (see speaker’s manual).
If the speaker impedance is 6 ohms, use the 4-ohm row in the charts below.
Speaker pairs
- Determine the total number of 8-ohm pairs of speakers. Also determine the total
number of 4 ohm pairs of speakers.
Appropriate chart
- Choose the “4-ohm Amplifi er” or “8-ohm Amplifi er” impedance matching
chart below that matches the amplifi er's minimum impedance. If the amplifi er is 6 ohm stable, use
the 8 ohm chart.
Appropriate row and column
- Cross reference the total number of 4-ohm pairs of speakers (rows
on charts below) with the total number of 8 ohm pairs of speakers (columns on charts below) to
choose the right switch position (1X, 2X, 4X or 8X.) - see illustration on page 5.
0 1 2 3 4 5 6 7 8
0
- 1X 2X 4X 4X 8X 8X 8X 8X
1
2X 4X 4X 8X 8X 8X 8X
2
4X 8X 8X 8X 8X
3
8X 8X 8X
4
8X
Impedance Matching For 8-ohm Amplifiers
8-ohm Speaker Pairs
4-ohm Speak
er P
airs
0 1 2 3 4 5 6 7 8 9 10
11
12
13
14
15
16
0
- 1X 1X 2X 2X 4X 4X 4X 4X 8X 8X 8X 8X 8X 8X 8X 8X
1
1X 2X 2X 4X 4X 4X 4X 8X 8X 8X 8X 8X 8X 8X 8X
2
2X 4X 4X 4X 4X 8X 8X 8X 8X 8X 8X 8X 8X
3
4X 4X 4X 8X 8X 8X 8X 8X 8X 8X 8X
4
4X 8X 8X 8X 8X 8X 8X 8X 8X
5
8X 8X 8X 8X 8X 8X 8X
6
8X 8X 8X 8X 8X
7
8X 8X 8X
8
8X
Impedance Matching For 4-ohm Amplifiers
8-ohm Speaker Pairs
4-ohm Speak
er P
airs
ALT-126R_Manual.indd 4
7/1/14 12:23 PM
