Russound Stereo Amplifier R1250MC User Guide

R-Series  
R1250MC  
6-Zone, 12-Channel  
Power Amplifier  
User’s Manual  
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R1250MC AMPLIFIER  
INTRODUCTION  
The R1250MC is rated at 50 watts per channel into 8  
ohms and 80 watts per channel into 4 ohms. With the  
Stereo/Bridge Mono switch in the Bridge mode position,  
both channels in the zone are combined fora higher pow-  
ered mono output. In bridged mode, the R1250MC pro-  
vides 140 watts of power into a single 8-ohm load. All  
this power is backed by three high output toroidal trans-  
formers. Each amplifier output channel incorporates  
robust protection circuitry for safety and reliability under  
extreme circumstances.  
The Russound R1250MC is a 12-channel power amplifier  
and is ideal for use as the main amplifier in home theater  
and distributed audio systems. The 12 channels are  
arranged in pairs to provide amplification for six stereo  
zones. The R1250MC provides an array of useful fea-  
tures such as bridge mode operation, independent zone  
triggering, bus inputs and multiple speaker outputs per  
zone to meet a wide variety of applications and configu-  
rations.  
FRONT PANEL  
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Zone Indicator LEDs: The six LEDs correspond to the six stereo zone amplifiers. The LED will illuminate red  
when the amplifier power is on and the zone is in standby. The LED will illuminate green when the zone is active.  
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RACK MOUNTING  
The R1250MC amplifier can be rack mounted using the included rack-mount ears and hardware to attach the ears to  
the amplifier. The amplifier will take 3 rack spaces with the feet removed.  
R1250MC Side View  
Rack Ear  
Screw Holes  
Rack Ear  
Side View  
Rack Ear  
Front View  
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R1250MC AMPLIFIER  
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11  
10  
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Bus Input/Output: The bus line input is an optional  
input that can be used to connect a single source  
to multiple zones. The bus line output is a passive  
passthrough of the bus input and can be used to  
daisy chain the source to other amplifiers in the  
system.  
Fuse Receptacle: Holds a replaceable fuse for AC  
power input connection. Fuse rating for North  
America and Europe is T10AL 250V.  
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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Line Input: The line audio input for each zone is a  
dedicated sensing input that will activate the zone  
when an audio signal from a source is present.  
12VDC Trigger In/Out: The 12V Trigger In is  
used to activate the zone. 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.  
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Line/Bus Switch: Sets the zone input to the Line  
audio input or the Bus input.  
Speaker Outputs: The A and B speaker outputs  
are in parallel to the amplifier output. The minimum  
speaker impedance for stereo mode operation is 4  
ohms for one pair and 8 ohms for two pairs of  
speakers. The minimum impedance for bridged  
mode operation is 8 ohms for Speaker B only.  
Delay Time: Muting delay can be adjusted from  
about 0.5 minute to 4.5 minutes. When an audio  
signal is not present, the amplifier will automatically  
go into standby mode after the preset period of  
time. When set to maximum, the amplifier will stay  
active and not go into standby.  
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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 con-  
trol is used.  
Stereo/Bridge Mono Switch: Sets each zone  
amplifier for stereo or bridged mono operation.  
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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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R1250MC AMPLIFIER  
BRIDGED OPERATION  
When the amplifier is in Bridged mode operation, both  
the left and right channels are combined for a higher  
power 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.  
RCA Cable from source  
Right In  
Left In  
Line In  
L
R
Line In  
L
R
Bridg e  
In  
Bridg e  
In  
Line In  
Bus In  
Line In  
Bus In  
Speak er  
Speak er  
R+  
R+  
A
A
R-  
L-  
R-  
L-  
L
L
L+  
L+  
R
R
Ster eo  
(-)Negative  
(-)Negative  
Ster eo  
Speak er  
Speak er  
-
-
R+  
R-  
R+  
R-  
B
B
Speaker  
cable  
Speaker  
cable  
Bridg e Mono  
Bridg e Mono  
Stereo mode  
4? minimum  
impedance  
L-  
Stereo mode  
4? minimum  
impedance  
L-  
L+  
+
L+  
+
Bridge mode  
8? minimum  
impedance  
Bridge mode  
8? minimum  
impedance  
(+)Positive  
(+)Positive  
DelayTime  
DelayTime  
Right Speaker  
8 ohm  
Left Speaker  
8 ohm  
Out Trigger In  
12V 100mA  
Out Trigger In  
12V 100mA  
Zone 1  
2
Zone  
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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R1250MC AMPLIFIER  
POSSIBLE SYSTEM CONFIGURATION  
The R1250MC can be configured as the main amplifier for an audio distribution system or home theater system.  
When used with an audio distribution preamp, each zone can independently drive one of several different sources by  
using each zone’s individual line audio inputs, or a pair of zones can be bridged to create a higher powered zone.  
When the R1250MC is used as a home theater amplifier, three zones can be bridged to provide high power for the  
front and center channels and the remaining zones can be used for the surround effects.  
CAV6.6  
Controller  
R1250MC  
Amplifier  
Bridged  
Independent Stereo  
Bus Input  
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R1250MC AMPLIFIER  
SPECIFICATIONS  
Single Zone Maximum Output Power: 50W per channel, 2 channels at 8 ohms  
(0.1% THD+N; f=1 kHz) 80W per channel, 2 channels at 4 ohms  
140W at 8 ohms, 2 channels bridged  
All Zones Continuous Output Power: 35W per channel, 12 channels at 8 ohms  
50W per channel, 12 channels at 4 ohms  
100W at 8 ohms, each zone bridged  
THD+N: <0.05% from 20Hz to 20kHz  
Signal-to-Noise Ratio: >100dB  
Frequency Response: 20Hz to 20KHz +/- 0.3dB  
Input Sensitivity: 70mV for 1W at 8 ohms  
500mV for 50W at 8 ohms  
Input Impedance: 47kohms Line Input  
Voltage Gain: 32dB  
Delay Time: 0.5 to 4.5 minutes  
Input Trigger: 12VDC 10 kohms  
Output Trigger: 12VDC 100mA  
Power Requirements: North American Model:  
120VAC 60Hz 7A  
IEC 320 type connector with 3 terminal detachable power cord.  
Fuse Rating: T10AL 250V  
Power Requirements: European Model:  
230VAC 50Hz 4A  
IEC 320 type connector with 3 terminal detachable power cord.  
Fuse Rating: T10AL 250V  
Dimensions: 17" W x 16.5"D x 5.875"H (43 x 42 x 15 cm)  
Weight: 48.9lbs. (22.2kg)  
WARRANTY  
The Russound R1250MC is fully guaranteed for two (2) years from the date of purchase against all defects in materials and work-  
manship. 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 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 author-  
ized 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 serv-  
ice. 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  
R1250MC Power Amplifier  
User’s Manual  
5 Forbes Rd. Newmarket, NH 03857, USA  
Tel 603.659.5170 • Fax 603.659.5388  
28-1168 04/22/05  
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