Russound Stereo Amplifier R275HC User Guide

R-Series  
R275HC  
2-Channel  
Power Amplifier  
User’s Manual  
 
R275HC AMPLIFIER  
INTRODUCTION  
The Russound R275HC is a 2-channel high-current power  
amplifier capable of driving low impedance loads and  
incorporates selectable volume control protection circuitry.  
The R275HC is rated at 75 watts per channel into 8  
ohms and 100 watts 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 Bridge mode the R275HC is rated  
at 200 watts of power into a single 8-ohm load. All this  
power is backed by a high output toroidal transformer.  
Each amplifier output channel incorporates robust pro-  
tection circuitry for safety and reliability under extreme  
circumstances.  
This amplifier can be used for power upgrades in specif-  
ic zones, for large speaker selector or volume control  
systems and for long series-parallel speaker runs  
(e.g., large outdoor zones).  
FRONT PANEL  
1
Tri-color Indicator LED: The LED will illuminate red when the power is on and the amplifier is in standby,  
green when the amplifier is active and orange when in short circuit protection.  
1
RACK MOUNTING  
The R275HC amplifier can be rack mounted using the included rack-mount ears and hardware to attach the ears to  
the amplifier. The amplifier will take 2 rack spaces with the feet removed.  
R275HC Side View  
Rack Ear  
Screw Holes  
Rack Ear  
Rack Ear  
Side View  
Front View  
3
 
R275HC AMPLIFIER  
1
2
3
4
3
7
8
5
5
6
6
7
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.  
Stereo/Bridge Mono Switch: Sets the pair of  
amplifier channels for stereo or bridge mono opera-  
tion.  
1
2
Line Input: The line audio input is a sensing input  
that will activate the amplifier when an audio signal  
from a source is present. When there is no audio  
the zone will go into standby. The Left input is used  
for bridged mono operation only.  
Low Cut (High Pass) Switch: Enables/disables the  
filter that reduces very low frequency energy and  
protects autoformer-based volume control/speaker  
selectors. When “on,” the filter is set to -3dB at 40  
Hz. When off, the frequency response is flat from  
20Hz to 20kHz.  
8
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.  
3
4
Gain Controls: Left and Right gain controls inde-  
pendently adjust the sound level for each channel.  
When used in the bridged mode only the Left control  
is used.  
Loop Output: The loop output is a passive  
passthrough of the line input. These jacks can be  
used to daisy chain the input signal to another  
amplifier in the system.  
5
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.  
4
 
R275HC AMPLIFIER  
BRIDGED OPERATION  
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.  
When the amplifier is in Bridged mode operation, both  
the left and right channels are combined for a higher  
power mono output.  
For bridged amplifier operation, turn off the power to the  
amplifier and connect an 8-ohm minimum load to the  
Speaker B output.  
(+)Positive  
(-)Negative  
Audio RCA Cable from source  
Speaker  
cable  
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.  
5
 
R275HC AMPLIFIER  
POSSIBLE SYSTEM CONFIGURATIONS  
enables a filter that reduces the low frequency energy  
which protects the volume controls/speaker selectors  
and increases the efficiency of the system.  
The R275HC can be configured for large autoformer-  
based volume control systems/speaker selectors. When  
using the R275HC for this application, set the Low Cut  
switch to the “On” position. Turning this filter “on”  
Line out from Source  
Low Cut switch  
in “Onposition  
S P E A K E R S  
S P E A K E R S  
S P E A K E R S  
S P E A K E R S  
EZB-1SC Modular  
Autoformer-based  
Connecting Block  
volume control  
RUSSOUND  
SPEAKERS  
SPEAKERS  
SPEAKERS  
SPEAKERS  
8-ohm Speaker  
The R275HC can also be configured as a power upgrade for specific zones, for use with large speaker selectors and  
for long series-parallel speaker runs (e.g., outdoor zones).  
CAM6.6  
RCA Cable  
CAM6.6T Controller  
R275HC Amplifier  
Speaker Cable  
8-ohm Speaker  
Speaker Cable  
8-ohm Speaker  
6
 
R275HC AMPLIFIER  
SPECIFICATIONS  
Stereo Continuous Output Power: 75W per channel at 8 ohms  
100W per channel at 4 ohms  
Bridged Output Power: 200W 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  
610mV for 75W at 8 ohms  
Input Impedance: 47kohms Line Input  
Voltage Gain: 32dB  
Power Requirements: North American Model:  
120VAC 60Hz 2.5A  
IEC 320 type connector with 3 terminal detachable power cord.  
Power Requirements: European Model:  
230VAC 50Hz 1.2A  
IEC 320 type connector with 3 terminal detachable power cord.  
Dimensions: 17" W x 14"D x 4.125"H (43 x 35.5 x 10.5 cm)  
Weight: 20.3lbs. (9.2kg)  
WARRANTY  
The Russound R275HC 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.  
7
 
R-Series  
R275HC  
2-Channel  
Power Amplifier  
User’s Manual  
5 Forbes Rd. Newmarket, NH 03857, USA  
Tel 603.659.5170 • Fax 603.659.5388  
28-1167  
03/22/05  
 

Pyramid Car Audio Car Amplifier PB440X User Guide
Radica Games Games 74014 User Guide
Raymarine Marine GPS System A65HD User Guide
RocketFish Video Gaming Accessories RF GPS31104 User Guide
Rockford Fosgate Portable Speaker P152S User Guide
Rosewill Landscape Lighting RSL 100 User Guide
Samsung Security Camera SCC B5342 User Guide
Sanyo DVR DSR M810 User Guide
Schwinn Exercise Bike 231 User Guide
SECO LARM USA Door SD 969 A18 User Guide