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23456
SDB-6.1
O
FF A
O
N B
O
FF A
O
N B
O
FF A
O
N B
O
FF A
O
N B
O
FF A
O
N B
O
FF A
O
N B
1
O
FF
ON
FAMILY ROOM
GUEST BATHMASTER BATH GUEST BEDMASTER BEDTHEATER ROOM
234
SDB-4.1
O
FF A
O
N B
O
FF A
O
N B
O
FF A
O
N B
O
FF A
O
N B
1
O
FF
ON
PORCH
MASTER BEDKITCHENMASTER BATH
2
SDB-2.1
O
FF A
O
N B
O
FF A
O
N B
1
O
FF
ON
MASTER BATH MASTER BED
Dual Source Speaker Selectors
SDB Series
Installation Manual
Page 2
PRODUCT DESCRIPTION / CONNECTIONS
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 Pairs
4-ohm Pairs
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
2 4X 8X 8X 8X 8X
3 8X 8X 8X
4 8X
Impedance Matching For 8-ohm Amplifiers
8-ohm Pairs
4-ohm Pairs
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 dierent ampliers/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/o switch,
located on the front of the unit. The SDB speaker selectors work with all speakers
rated from 4 to 8 ohms, and ampliers 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.
Determine the amplier’s minimum impedance. Consult the individual 1.
product specications or the back panel of the amplier near the speaker
terminals. AC impedance is measured in ohms.
Identify the correct impedance-matching chart below according to your 2.
amplier’s minimum impedance: either for a 4 ohm amplier or an 8 ohm
amplier. If your amplier is 6 ohm stable, use the 8 ohm chart.
Determine the impedance for each pair of speakers (see its manual).3.
Determine the total number of 4 ohm pairs of speakers (rows on charts).4.
Determine the total number of 8 ohm pairs of speakers (columns on 5.
charts).
Use the appropriate row and column to determine jumper settings. 6.
Connections
All SDB models have 4-pole screw down removable terminals for speaker and
amplier connections. These accept wire up to 12 gauge.
Remove the terminal by rmly 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 amplier(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 amplier that is
overworked or that has an improper load). These can cause an amplier/receiver
to go into protection, and can cause autoformers on volume controls to heat
up, damaging system components. To set up the system, the amplier/receiver
volume should be at its lowest setting, and the selector volume control should be
at the highest setting. Slowly adjust the amplier/receiver volume to a level that is
acceptable for the amplier to produce without clipping.
Operation
To operate the SDB speaker selector, simply power the ampliers and select a source
for each amplier. 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 amplier A or B.
2 Russound SDB Series Installation Manual
Rev. 5
Page 3
OFF A
O
N B
2
Amp / Receiver B
Volume
On / Off
Amp / Receiver A
ON B ON B
2
SPEAKER 6
L+ L- R- R+
SPEAKER 5
L+ L- R- R+
SPEAKER 4
L+ L- R- R+
SPEAKER 3
L+ L- R- R+
SPEAKER 2
L+ L- R- R+
SPEAKER 1
L+ L- R- R+
AMP B
L+ L- R- R+
AMP A
L+ L- R- R+
SDB-6. 1 NEWMARKET , NH US A
Speakers
SDB-6.1 (back)
Amplifier
SDB Series Speaker Selector
Front detail of dual-source
speaker control
SDB speaker selector diagram showing connection of speaker and amplier (Not to scale)
Technical Specications
SDB-2.1
Power : 100 watts per channel RMS continuous
200 watts per channel average
300 watts per channel peak
Volume Control: 42 dB attenuation, 12 positions
Impedance Matching: Russound Ultra-Match™ Autoformers
Wire Size: up to 12 gauge wire
Dimensions: 8.5” W x 3.0” H x 6.25” D
(21.6 x 7.6 x 15.9 cm)
Weight: 4 lb (1.8 kg)
SDB-4.1
Power : 200 W per channel RMS continuous
400 W per channel average
600 W per channel peak
Volume Control: 42 dB attenuation, 12 positions
Impedance Matching: Russound Ultra-Match™ Autoformers
Wire Size: up to 12 gauge wire
Dimensions: 17.0” W x 3.0” H x 6.25” D
(43.2 x 7.6 x 15.9 cm)
Weight: 9 lb (4.05 kg)
DIAGRAM / TECH SPECS / WARRANTY
SDB-6.1
Power : 150 W per channel RMS continuous
300 W per channel average
450 W per channel peak
Volume Control: 42 dB attenuation, 12 positions
Impedance Matching: Russound Ultra-Match™ Autoformers
Wire Size: up to 12 gauge wire
Dimensions: 17.0” W x 3.0” H x 6.25” D
(43.2 x 7.6 x 15.9 cm)
Weight: 10 lb (4.5 kg)
Warranty
The Russound SDB Series is fully guaranteed against all defects in materials and
workmanship for ten (10) years from the date of purchase. During this period,
Russound will replace any defective parts and correct any defect in workmanship
without charge for either parts or labor.
For this warranty to apply, the unit must be installed and used according to its
written instructions. If service is necessary, it must be performed by Russound. The
unit must be returned to Russound at the owner’s expense and with prior written
permission. Accidental damage and shipping damage are not considered defects,
nor is damage resulting from abuse or from servicing by an agency or person not
specically authorized in writing by Russound.
This Warranty does not cover:
Rev. 5
Damage caused by abuse, accident, misuse, negligence, or improper installation •
or operation
Power surges and lightning strikes•
Normal wear and maintenance•
Products that have been altered or modied•
Any product whose identifying number, decal, serial number, etc. has been •
altered, defaced or removed.
Russound SDB Series Installation Manual
Russound sells products only through authorized Dealers and Distributors to
ensure that customers obtain proper support and service. Any Russound product
purchased from an unauthorized dealer or other source, including retailers, mail
order sellers and online sellers will not be honored or serviced under existing
Russound warranty policy. Any sale of products by an unauthorized source or other
manner not authorized by Russound shall void the warranty on the applicable
product.
Damage to or destruction of components due to application of excessive power
voids the warranty on those parts. In these cases, repairs will be made on the basis of
the retail value of the parts and labor. To return for repairs, the unit must be shipped
to Russound at the owner’s expense, along with a note explaining the nature of
service required. Be sure to pack the unit in a corrugated container with at least
three (3) inches of resilient material to protect the unit from damage in transit.
Before returning a unit for repair, call Russound at (603) 659-5170 for a Return
Authorization number. Write this number on the shipping label and ship to:
Russound, ATTN: Service, 5 Forbes Road, Newmarket, NH 03857
Due to continual eorts to improve product quality as new technology and
techniques become available, Russound/FMP, Inc. reserves the right to revise system
specications without notice.
3
Page 4
SDB Series
Dual Source Speaker Selectors
Installation Manual
©2008 Russound. All rights reserved.
All trademarks are the property of their respective owners.
Specications are subject to change without notice.
Russound is not responsible for typographical errors or omissions.
Russound, Inc.
5 Forbes Road, Newmarket, NH 03857
tel603.659.5170•fax603.659.5388
email: tech@russound.com www.russound.com
28-0078 Rev. 5 11/12/08
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