R-Series
R235LS
2-Channel Power Amplifier
with Local Source Switching
User’s Manual
On
Off
R U S S O U N D R 2 3 5 L S P O W E R A M P L I F I E R
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R235LS AMPLIFIER
INTRODUCTION
The R235LS is rated at 35 watts per channel into 8
ohms and 50 watts per channel into 4 ohms. With the
Stereo/Bridge Mono switch in the Bridge Mono position,
both amplifier channels are combined for a higher pow-
ered mono output. In bridged mode the R235LS is rated
at 100 watts of power into a single 8-ohm load.
The Russound R235LS is a 2-channel power amplifier
with automatic local source switching capability.
The R235LS allows a local source (e.g., PC or TV in the
bedroom) to automatically override the speakers in that
particular zone of a distributed audio system. This can
be accomplished with a variety of input/trigger options
for versatility in many different applications.
Each amplifier output channel incorporates robust pro-
tection circuitry for safety and reliability under extreme
circumstances.
FRONT PANEL
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U S S O U N D R 2 3 5 L S P O W E R
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M P L I F I E R
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Power LED: The LED will illuminate red when the
power is on and the amplifier is in Default/standby
mode and illuminate green when the amplifier is
active.
2
Power Switch: Turns the amplifier on/off. This
switch does not disconnect the main power feed
from the amplifier; this requires that the power cord
be unplugged from the outlet.
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R235LS AMPLIFIER
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10
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Line Input: The line audio input is a sensing input
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Default Input: The default input is a speaker-level
passthrough from the default input to the speaker
output.
that will activate the amplifier when an audio signal
from a source is present. Only the Left input is used
for bridged mode operation.
Speaker A/B Outputs: The A and B speaker out-
puts are in parallel to the amplifier output. The mini-
mum load in stereo mode is 4 ohms. This can be
used to drive up to 2 pairs of 8-ohm speakers or 1
pair of 4-ohm speakers. The minimum load imped-
ance for bridged mode operation is 8 ohms,
Speaker B only.
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3
Gain Controls: Left and Right gain controls inde-
pendently adjust the sound level for each channel.
When in bridged mode only the Left control is used.
Delay Time: The delay can be adjusted from about
5 seconds to 5 minutes. When an audio signal is
not present, this delay setting will automatically
switch the amp to the Default input mode after the
preset period of time.
AC Input: The AC voltage input for the North
American model is 120VAC at 60Hz (for the
European model, 230VAC at 50Hz). This receptacle
accepts a 3-prong IEC 320 type connector. A
detachable 3-terminal power cord is included.
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4
5
12VDC Trigger In/Out: The 12V Trigger In con-
trols the amplifier switching from the default input
(distributed audio system) to a local source. The
Trigger Out provides 100mA 12V max. This can be
used to drive other 12V triggered devices. The
delay and audio sensing are bypassed when the
12V trigger input is used.
Amplified Input: The amplified input accepts
speaker level signals and is a sensing input that will
activate the amplifier when an audio signal is
present.
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Stereo/Bridge Mono Switch: Sets the pair of
amplifier channels for stereo or bridged mono oper-
ation.
Video Input: The Video Input is a sensing input that
activates the R235LS when a video signal is
present.
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R235LS AMPLIFIER
BRIDGED OPERATION
When the amplifier is in bridged mode operation, both
the left and right channels are combined for a higher
powered mono output.
Following the Bridge Mode markings in red on the back
of the amplifier: Connect the negative lead (-) of the
speaker cable to the R+ terminal. Connect the positive
lead (+) of the speaker cable to the L+ terminal. Set the
Stereo/Bridge Mono switch to Bridge Mono, connect the
Line In feed from a source to the Left Line In connection
and restore power to the amplifier.
For bridged amplifier operation, turn off the power to the
amplifier and connect an 8-ohm minimum load to the
Speaker B output.
Audio RCA
cable from
source
Speaker Lead
(+)Positive
Speaker Lead
(-)Negative
Speaker
cable
(-)Negative
(+)Positive
Connections for
Bridged output
8-ohm Speaker
THERMAL PROTECTION
PROTECTION CIRCUITRY
All Russound amplifiers are designed with special circuit-
ry to safeguard the amplifier under a thermal overload
condition. Thermal protection mode can only engage
when the unit has been run at high volume for extended
periods of time without adequate ventilation and/or when
speaker impedances are below the minimum levels for
the amplifier. If this fault occurs, turn off the amplifier,
and check that the speaker impedance rating is above
the minimum rating. Also check for adequate ventilation
around the amplifier and make adjustments if necessary.
Once the unit has cooled to safe operating tempera-
tures, the amplifier may be powered back on.
All Russound amplifiers are designed with special circuit-
ry to safeguard the amplifier under a short-circuit condi-
tion. A faulty speaker can also cause a short circuit con-
dition.
The front panel LED illuminates orange when the amplifi-
er is in short circuit protection. If this fault condition
occurs, turn off the amplifier and check speakers for
short circuit conditions when appropriate.
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R235LS AMPLIFIER
POSSIBLE SYSTEM CONFIGURATION
The R235LS can be used as a single-source two-channel
zone amplifier, or as a local-source amplifier that auto-
matically switches between a default source (e.g., a
whole-house audio distribution system) and a local
source (e.g., a television set in the bedroom or a PC in
the office).
Line Outputs
Video
Amplified output
to room speakers
Right
Left
A/V RCA Cables
Speaker Cable
R235LS Amplifier
Amplified input
Optional video sensing
from audio
distribution system
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R235LS AMPLIFIER
SPECIFICATIONS
Stereo Continuous Output Power: 35W per channel at 8 ohms
50W per channel at 4 ohms
Bridged Output Power: 100W at 8 ohms, 2 channels bridged
THD+N: 0.05% from 20Hz to 20kHz
Signal-to-Noise Ratio: >100dB A-weighted
Frequency Response: 20Hz to 20KHz +/- 0.3dB
Input Sensitivity: 70mV for 1W at 8 ohms
420mV for 35W at 8 ohms
Input Impedance: 47kohms Line Input
Voltage Gain: 32dB
Delay Time: 5 seconds to 5 minutes
Input Trigger: 12VDC 10kohms
Output Trigger: 12VDC 100mA max
Power Requirements: North American Model:
120VAC 60Hz 1.2A
IEC 320 type connector with 3 terminal detachable power cord.
Power Requirements: European Model:
230VAC 50Hz 0.6A
IEC 320 type connector with 3 terminal detachable power cord.
Dimensions: 8.625" W x 10"D x 2.375"H (22 x 25.4 x 6 cm)
Weight: 8.5 lbs. (3.8kg)
WARRANTY
The Russound R235LS is fully guaranteed for two (2) years from the date of purchase against all defects in materials
and workmanship. During this period Russound will replace any defective parts and correct any defect in workman-
ship 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 owners expense and with prior written permission. Accidental damage and shipping damage are not
considered defects under the terms of the warranty. Russound assumes no responsibility for defects resulting from
abuse or servicing performed by an agency or person not specifically authorized in writing by Russound. Damage to
or destruction of components due to improper use voids the warranty. In these cases the repair will be made at the
owners expense. To return for repairs, the unit must be shipped to Russound at the owners expense, along with a
note explaining the nature of the service required. Be sure to pack in a corrugated container with at least 3 inches of
resilient material to protect the unit from damage in transit.
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 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.
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R-Series
R235LS
2-Channel Power Amplifier
with Local Source Switching
User’s Manual
5 Forbes Rd. Newmarket, NH 03857, USA
Tel 603.659.5170 • Fax 603.659.5388
e-mail: [email protected]
28-1166 03/22/05
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