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1. Description
The SDB-2.1, SDB-4.1 and the SDB-6.1 are high-power,
dual-source, autoformer-based speaker selectors with indi-
vidual volume controls for 2, 4 or 6 pair of speakers. Dual-
source operation means two different amplifiers / receivers
can drive selected speakers simultaneously. For example,
you can choose to listen to jazz in a couple of rooms and
classical in all the others. Each speaker pair has its own input selector, volume control and on / off switch. The
SDB speaker selectors work with all speakers rated 4 ohms and above.
2. Connections
All SDB models have heavy-duty, removable screw connectors that accept wire up to 12 gauge wire. Connect
the amplifier's output to the AMP A and AMP B connections on the SDB, being sure to follow polarity from the
output of the amplifier to the input of the speaker selector (+ to +, - to -). Connect the speakers to the output of
the speaker selector, again being sure to follow the polarity.
3. Setting the Impedance
The impedance of the autoformers in the SDB Speaker Selectors is set at the factory to be proper for most appli-
cations, however, for certain applications, the setting must be changed. This can easily be done by removing the
cover of the unit and re-positioning 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. The
SDB-2.1 comes set at 2X; the SDB-4.1 at 4X; and the SDB-6.1 at 8X.
4. Operation
To operate the SDB speaker selector, simply turn on your amplifiers and select a source for each amplifier. At the
speaker selector, turn on your 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
will allow you to operate any combination of speakers selected to amplifier A or B.
M
ODEL
SDB-6. 1
S
6
PEAKER
L+ L- R- R+
N
, NH
EWMARKET
L+ L- R- R+
2
S
5
S
4
S
PEAKER
PEAKER
PEAKER
L+ L- R- R+
L+ L- R- R+
L+ L- R- R+
L+ L- R- R+
L+ L- R- R+
L+ L- R- R+
2
3
S
2
S
1
PEAKER
PEAKER
L+ L- R- R+
L+ L- R- R+
L+ L- R- R+
L+ L- R- R+
VOLUME
ON / OFF
AMP/ RECEIVER B
O
B
N
AMP/ RECEIVER A
O
A
FF
A
B
A
A
MP
MP
L+ L- R- R+
L+ L- R- R+
M
I
USA
ADE
N
L+ L- R- R+
L+ L- R- R+
POWER
POWER
AP-48
AP-48
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