SDB-2.1
MASTER BATH |
MASTER BED |
ON |
B |
ON |
B |
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A |
2 |
A |
OFF |
OFF |
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SDB-4.1 |
PORCH |
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MASTER BATH |
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MASTER BED |
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KITCHEN |
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ON |
B |
ON |
B |
ON |
B |
ON |
B |
1 |
A |
2 |
A |
3 |
A |
4 |
A |
OFF |
OFF |
OFF |
OFF |
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SDB-6.1 |
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FAMILY ROOM |
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THEATER ROOM |
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MASTER BATH |
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MASTER BED |
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GUEST BATH |
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GUEST BED |
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ON |
B |
ON |
B |
ON |
B |
ON |
B |
ON |
B |
ON |
B |
1 |
2 |
OFF |
A |
3 |
A |
4 |
A |
5 |
A |
6 |
A |
OFF |
A |
OFF |
OFF |
OFF |
OFF |
SDB Series
Dual Source Speaker Selectors
Installation Manual
product description / connections
Description
The SDB-2.1, SDB-4.1 and the SDB-6.1 are high-power, dual-source, autoformerbased speaker selectors with individual volume controls for 2, 4 or 6 areas/rooms. Dual-source operation means either one of two different amplifiers/receivers can be chosen to power selected speakers independently. For example, you can choose to listen to jazz music in a couple of rooms and classical music in all the others. Each room has its own input selector, volume control and on/off switch, located on the front of the unit. The SDB speaker selectors work with all speakers rated from 4 to 8 ohms, and amplifiers rated for 4 to 8 ohm loads.
Setting the Impedance
The impedance of the autoformers in SDB speaker selectors is set at the factory to be proper for most applications. The SDB-2.1 comes set at 2X; the SDB-4.1 at 4X; and the SDB-6.1 at 8X. However, if certain applications require changing the impedance setting, simply remove the cover of the unit and re-position the jumpers on the autoformers to the necessary impedance-matching setting. Russound SDB Speaker Selectors autoformers can be set to impedance-matching settings of 2X, 4X or 8X.
1.Determine the amplifier’s minimum impedance. Consult the individual product specifications or the back panel of the amplifier near the speaker terminals. AC impedance is measured in ohms.
2.Identify the correct impedance-matching chart below according to your amplifier’s minimum impedance: either for a 4 ohm amplifier or an 8 ohm amplifier. If your amplifier is 6 ohm stable, use the 8 ohm chart.
3.Determine the impedance for each pair of speakers (see its manual).
4.Determine the total number of 4 ohm pairs of speakers (rows on charts).
5.Determine the total number of 8 ohm pairs of speakers (columns on charts).
6.Use the appropriate row and column to determine jumper settings.
Connections
All SDB models have 4-pole screw down removable terminals for speaker and amplifier connections. These accept wire up to 12 gauge.
Remove the terminal by firmly pulling it out of its 4-pole connector. Strip about 3/8” of insulation from the ends of all wires to be connected. If necessary, twist the exposed conductor to insure that no loose strands exist. Insert the wire ends into the screw down connector, being careful to observe proper channel and polarity. Tighten the screws on the connectors. Connect the amplifier(s) and each speaker pair to the appropriate connector.
Speaker connections can support multiple speaker pairs wired in parallel or series, provided their combined impedance is a minimum of 4 ohms.
Setting System Volume
It is important to properly adjust an impedance-matching system to avoid distortion or DC clipping (DC voltage will be produced from an amplifier that is overworked or that has an improper load). These can cause an amplifier/receiver to go into protection, and can cause autoformers on volume controls to heat up, damaging system components. To set up the system, the amplifier/receiver volume should be at its lowest setting, and the selector volume control should be at the highest setting. Slowly adjust the amplifier/receiver volume to a level that is acceptable for the amplifier to produce without clipping.
Operation
To operate the SDB speaker selector, simply power the amplifiers and select a source for each amplifier. At the speaker selector, turn on the selected pair of speakers and select AMP A or AMP B. Set the volume by rotating the control clockwise to increase volume or counter-clockwise to decrease volume. The SDB speaker selectors allows operation of any combination of speakers selected to either amplifier A or B.
4-ohm Pairs
Impedance Matching For 8-ohm Amplifiers
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8-ohm Pairs |
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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 |
8X |
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2 |
4X |
8X |
8X |
8X |
8X |
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3 |
8X |
8X |
8X |
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4 |
8X |
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Impedance Matching For 4-ohm Amplifiers |
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8-ohm Pairs |
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0 |
1 |
2 |
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4 |
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6 |
7 |
8 |
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10 |
11 |
12 |
13 |
14 |
15 |
16 |
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0 |
- |
1X |
1X |
2X |
2X |
4X |
4X |
4X |
4X |
8X |
8X |
8X |
8X |
8X |
8X |
8X |
8X |
Pairs |
1 |
1X |
2X |
2X |
4X |
4X |
4X |
4X |
8X |
8X |
8X |
8X |
8X |
8X |
8X |
8X |
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2 |
2X |
4X |
4X |
4X |
4X |
8X |
8X |
8X |
8X |
8X |
8X |
8X |
8X |
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3 |
4X |
4X |
4X |
8X |
8X |
8X |
8X |
8X |
8X |
8X |
8X |
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4-ohm |
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4 |
4X |
8X |
8X |
8X |
8X |
8X |
8X |
8X |
8X |
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5 |
8X |
8X |
8X |
8X |
8X |
8X |
8X |
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6 |
8X |
8X |
8X |
8X |
8X |
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7 |
8X |
8X |
8X |
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8 |
8X |
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2 |
Russound SDB Series Installation Manual |
Rev. 5 |
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