Russound R1250MC User manual

l~Russound®
R-Series
R1250MC
6-Zone, 12-Channel
Power Amplifier
User's Manual

2
IMPORTANT SAFEGUARDS
lA_AI
'WARNING" " TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, 00 NOT
EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE."
"CAunON" " TO REDUCE THE RISK OF ELECTRIC SHOCK, 00 NOT REMOVE
COVER. NO USER - SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUAL~
FlED SERVICE PERSONNEL.
The lightning flash with arrowhead symbol, within an equilateral
triangle, is intended to alert the user to the presence of uninsLJ-
lated "dangerous voltage" within the products enclosure that
may be of sufficient magnitude to constitute a risk of electric
shock to persons.
The exclamation point within an equilateral triangle is intended
to alert the user to the presence of important operating and
maintenance (servicing) instructions in the literature accompa-
nying the appliance.
SAFETY INSTRUCTIONS
1. Read Instructions - All the safety and operating instructions should be read
before the appliance is operated.
2. Retain Instructions - The safety and operating instructions should be retained
for future reference.
3. Heed Warnings - All warnings on the appliance in the operating instructions
should be adhered to.
4. Follow Instructions - All operating and user instructions should be followed.
5. Water and Moisture - Do not use this appliance near water, for example, near
a bathtub, washbowl, kitchen sink, laundry tub, in a wet basement, or near a
swimming pool. Do not expose the appliance to dripping or splashing, and
do not place on the appliance objects filled with liquids such as vases. Do not
touch the amplifier with wet hands. Do not handle the amplifier or power cord
when your hands are wet or damp. ~ water or any other liquid enters the
amplifier cabinet, take the amplifier to qualified service personnel for inspec-
tion.
6. Cleaning - The appliance should be cleaned only as recommended by the
manufacturer. From time to time you should wipe off the front and side pan-
els and the cabinet with a soft cloth. Do not use rough material, thinners,
alcohol or other chemical solvents or cloths since this may damage the finish
or remove the panel lettering.
7. Ventilation - The appliance should be situated so that its location or position
does not interfere with its proper ventilation. For example, the appliance
should not be situated on a bed, sofa, rug, or similar surface that may block
the ventilation openings or, placed in a built - in installation, such as a book-
case or cabinet that may impede the flow of air through the ventilation open-
ings. Place the unit in a wel~entilated location, leaving at least 2 inches (5
cm) of clearance on all sides, top and rear of unit for air flow. ~ ventilation is
blocked, the unit may overheat and ma~nction ..
8. Heat - The appliance should be situated away from heat sources such as rad~
ators, heat registers, stoves, or other appliances ( including amplifiers) that
produce heat.
9. Grounding or Polarization - Precautions should be taken so that the grounding
or polarization means of an appliance is not defeated.
IO.Power Cord Protection - Power supply cords should be routed so that they
are not likely to be walked on or pinched by items placed upon or against
them, paying particular attention to cords at plugs, receptacles, and the point
where they exit from the appliance.
Il.Power Sources - The appliance should be connected to a power supply only
of the type described in the operating instructions or as marked on the appl~
ance.
12.Main Power Disconnect - The power switch is a singlepole switch. When the
switch is in the "Off' position, the appliance is not completely disconnected
from the main power. The main power plug is used as the disconnect device
and shall remain readily operable. When installing the product, ensure that the
plug is easily accessible.
13.Non-use Periods - The power cord of the appliance should be unplugged from
the outlet when left unused for a long period of time.
14.Attachments - Only use attachments/accessories specified by the manufac-
turer.
15.Carts and Stands - The appliance should be used only with <&
a cart or stand that is recommended by the manufacturer.
An appliance and cart combination should be moved with
care. Quick stops, excessive force and uneven surfaces
may cause the appliance and cart combination to overturn.
16Wall or ceiling Mounting - The appliance should be mounted to a wall or cei~
ing only as recommended by the manufacturer.
1 7. Location of the Amplifier - Do not mount this unit under a kitchen cabinet. Do
not expose the amplifier to direct sun light or heating units as the amplifier
intemal components' temperature may rise and shorten the life of the compo-
nents. Avoid damp and dusty places.
18.0bject and Liquid Entry - Care should be taken so that objects do not fall and
liquids are not spilled into the enclosure through the openings.
19.5ervicing - The user should not attempt to service the appliance beyond that
described in the operating instructions. All other servicing should be referred
to qualified service personnel.
20Damage Requiring Service - The appliance should be serviced by qualified
service personnel when:
A. The power - supply cord or the plug has been damaged; or
B. Objects have fallen, or liquid has been spilled into the appliance; or
C. The appliance has been exposed to rain; or
D. The appliance does not appear to operate normally; or
E. The appliance has been dropped or the enclosure is damaged.
CE

INTRODUCTION
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
R1250MC AMPLIFIER
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.
II
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R 1 250MC POWER AMPlIFIE.
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o Zone Indicator LEOs: The six LEOs 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.
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.
Rack Ear
Side View
R1250MC Side View o
o
Rack Ear
Front View
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Rack Ear
Screw Holes
3

R1250MC AMPLIFIER
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Bus Input/Output: The bus line input is an optional
II
Fuse Receptacle: Holds a replaceable fuse for AC
input that can be used to connect a single source power input connection. Fuse rating for North
to multiple zones. The bus line output is a passive
America and Europe is T1 OAL 250V.
passthrough of the bus input and can be used to
AC Input: The AC voltage input for the North
daisy chain the source to other amplifiers in the
system.
II
American model is 120VAC at 60Hz (for the
European model, 230VAC at 50Hz). This receptacle
II
Line Input: The line audio input for each zone is a
accepts a 3-prong IEC 320 type connector. A
dedicated sensing input that will activate the zone
detachable 3-terminal power cord is included.
when an audio signal from a source is present.
12VDC Trigger In/Out: The 12V Trigger In is
II
Line/Bus Switch: Sets the zone input to the Line
II
used to activate the zone. The Trigger Out provides
audio input or the Bus input.
100mA 12V max. This can be used to drive other
II
Speaker Outputs: The A and B speaker outputs
12V triggered devices. The delay and audio sensing
are bypassed when the 12V trigger input is used.
are in parallel to the amplifier output. The minimum
speaker impedance for stereo mode operation is 4Delay Time:
Muting delay can be adjusted from
ohms for one pair and 8 ohms for two pairs of
Em
about 0.5 minute to 4.5 minutes. When an audio
speakers. The minimum impedance for bridged
signal is not present, the amplifier will automatically
mode operation is 8 ohms for Speaker B only.
go into standby mode after the preset period of
III
Gain Controls: Left and Right gain controls inde-
time. When set to maximum, the amplifier will stay
active and not go into standby.
pendently adjust the sound level for each channel.
When used in the bridged mode only the Left con-
Stereo/Bridge Mono Switch: Sets each zone
trol is used.
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amplifier for stereo or bridged mono operation.
II 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.

BRIDGED OPERATION
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.
R1250MC AMPLIFIER
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.
RCA Cable from source
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Zone 2I Out Trigger In
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80hm
12V 100mA
11V 100mA
THERMAL PROTECTION
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.
PROTECTION CIRCUITRY
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

R1250MC AMPLIFIER
POSSIBLE SYSTEM CONFIGURATION
The R 1250MC 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.
e
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CAV6.6
Controller
Bus Input
It 1.,1
Bridged Independent Stereo
R1250MC
Amplifier
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6

SPECIFICATIONS
Single Zone Maximum Output Power:
(0.1 % THD+N; f=1 kHz)
All Zones Continuous Output Power:
THD+N:
Signal-to-Noise Ratio:
Frequency Response:
Input Sensitivity:
Input Impedance:
Voltage Gain:
Delay Time:
Input Trigger:
Output Trigger:
Power Requirements:
Power Requirements:
Dimensions:
Weight:
R1250MC AMPLIFIER
50W per channel, 2 channels at 8 ohms
80W per channel, 2 channels at 4 ohms
140W at 8 ohms, 2 channels bridged
35W per channel, 12 channels at 8 ohms
50W per channel, 12 channels at 4 ohms
100W at 8 ohms, each zone bridged
<0.05% from 20Hz to 20kHz
>100dB
20Hz to 20KHz +/- 0.3dB
70mV for 1W at 8 ohms
500mV for 50W at 8 ohms
47kohms Line Input
32dB
0.5 to 4.5 minutes
12VDC 10 kohms
12VDC 100mA
North American Model:
120VAC 60Hz 7A
IEC 320 type connector with 3 terminal detachable power cord.
Fuse Rating: TlOAL 250V
European Model:
230VAC 50Hz 4A
IEC 320 type connector with 3 terminal detachable power cord.
Fuse Rating: Tl OAL 250V
17" Wx 16.5"D x 5.875"H (43 x 42 x 15 cm)
48.9Ibs. (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.
7

R-Series
R1250MC Power Amplifier
User's Manual
5 Forbes Rd. Newmarket, NH 03857, USA
Tel [phone] • Fax [phone]
e-mail: [email protected]
28-1168 06/24/05