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Overview: The Russound SDB-2.1 is a dual source speaker selector that allows
you to control two pairs of speakers. The front panel has separate volume
controls for each speaker pair so you can adjust the volume in each room from
one convenient location. At each volume control, you can turn each pair of
speakers on or off, and select amplifier A or B using the two 2-position
push-buttons on the front panel.
Ultra-Match Technology: The SDB-2.1 uses high quality impedance matching autoformers
that distribute maximum power throughout the system while maintaining a safe
operating load at the amplifier. You can use the speaker selector with 4- or
8-ohm speakers. Internal jumpers allow you to select the degree of impedance
matching for your speakers and amplifier.
Note: The unit is set at the factory at 2x, which is proper for
most applications. If certain applications require changing the impedance
setting, you will need to remove the cover and reposition the jumper on the
Volume Controls: The SDB-2.1 has two rotary volume controls with 11
steps of volume, plus an off position. The volume control provides a total of 42
Connections: The speaker selector features four 4-pole screw terminal
blocks, two for the inputs from the amplifiers, and two for the outputs to the
two speaker pairs. The terminals allow you to connect up to 12-gauge speaker
wire. The terminals can be unplugged from the volume control for easier wiring.
Room Labels: The SDB-2.1 comes with a sheet of non-adhesive room labels which
slide into a groove in the front panel. A total of 52 labels and 8 blanks are
Performance: The unit will accept up to 100 watts RMS per channel (300