Russound Stereo Amplifier R235LS User Guide

R-Series  
R235LS  
2-Channel Power Amplifier  
with Local Source Switching  
User’s Manual  
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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  
 
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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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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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  
28-1166 03/22/05  
 

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