R850MC
4-Zone, 8-Channel Power Amplier
Installation Manual
SAFETY INSTRUCTIONS
Cleaning - The appliance should be cleaned only as 6.
recommended by the manufacturer. From time to time you
should wipe o the front and side panels 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 nish or remove the panel lettering.
7.
WARNING: TO REDUCE THE RISK OF FIRE
OR ELECTRIC SHOCK, DO NOT EXPOSE THIS
APPLIANCE TO RAIN OR MOISTURE.
CAUTION: TO REDUCE THE RISK OF ELECTRIC
SHOCK, DO NOT REMOVE THE COVER. NO USERSERVICEABLE PARTS INSIDE. REFER SERVICING
TO QUALIFIED SERVICE PERSONNEL.
The lightning ash with arrowhead symbol,
within an equilateral triangle, is intended to alert
the user to the presence of uninsulated dangerous
voltage within the product’s enclosure that may
be of sucient 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
accompanying the appliance.
Safety Instructions
Read Instructions - All the safety and operating instructions 1.
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 - The appliance should not be used near
water; for example, near a bathtub, washbowl, kitchen sink,
laundry tub, in a wet basement, or near a swimming pool.
The apparatus shall not be exposed to dripping or splashing
liquids and no objects lled with liquids, such as vases, shall
be placed on the apparatus. Do not touch the appliance
with wet hands. Do not handle the appliance or power cord
with wet or damp hands. If water or any other liquid enters
the appliance cabinet, take it to qualied ser vice personnel
for inspection.
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 bookcase or cabinet that may impede
the ow of air through the ventilation openings. Place the
unit in a well-ventilated location, leaving at least 2 inches
(5 cm) of clearance on all sides, top and rear of unit for air
ow. If ventilation is blocked, the unit may overheat and
malfunction.
8.
Heat - The appliance should be situated away from heat
sources such as radiators, heat registers, stoves, or other
appliances (including ampliers) that produce heat.
9.
Grounding or Polarization - Precaution should be taken so
that the grounding or polarization means of an appliance is
not defeated.
10.
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.
11.
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 appliance.
12.
Main Power Disconnect - The power switch is a single-pole
switch. When the switch is in the “O” 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 specied
by the manufacturer.
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
2 Russound R850MC Installation Manual Rev. 3
force and uneven surfaces may cause the appliance and cart
combination to overturn.
16.
Wall or Ceiling Mounting - The appliance should be
mounted to a wall or ceiling only as recommended by the
manufacturer.
17.
Location of the Amplier - Do not mount this unit under a
kitchen cabinet. Do not expose the amplier to direct sun
light or heating units as the amplier internal components’
temperature may rise and shorten the life of the components.
Avoid damp and dusty places.
18.
Object 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.
Servicing - The user should not attempt to service the
appliance beyond that described in the operating
instructions. All other servicing should be referred to
qualied service personnel.
20.
Damage Requiring Service - The appliance should be
serviced by qualied service personnel when: A. The power
supply cord or the plug has been damaged; B. Objects have
fallen, liquid has been spilled into the appliance; 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.
Note: This equipment has been tested and found to comply
with the limits for a Class B digital device, pursuant to part 15 of
the FCC rules. These limits are designed to provide reasonable
protection against harmful interference in a residential
installation. This equipment generates, uses and can radiate radio
frequency energy and, if not installed and used in accordance
with the instructions, may cause harmful interference to radio
communications. However, there is no guarantee that interference
will not occur in a particular installation. If this equipment does
cause harmful interference to radio or television reception, which
can be determined by turning the equipment o and on, the
user is encouraged to try to correct the interference by one of or
more of the following measures: reorient or relocate the receiving
antenna; increase the separation between the equipment and
receiver; connect the equipment into an outlet on a circuit
dierent from that to which the receiver is connected, or consult
the dealer or an experienced radio/TV technician for help.
This Class B digital apparatus complies with Canadian ICES-003.
Cet appareil numérique de la classe B est conforme à la norme
NMB-003 du Canada.
PRODUCT OVERVIEW
+
+
R850MC Side View
Rack Ear
Front View
Rack Ear
Side View
Rack Ear
Screw Holes
Introduction
The Russound R850MC is an 8-channel power amplier and is ideal for use
as the main amplier in home theater and distributed audio systems. The
eight channels are arranged in pairs to provide amplication for four stereo
zones. The R850MC provides an array of useful features such as bridge mode
operation, independent zone triggering, bus inputs and multiple speaker
outputs per zone to meet a wide variety of applications and congurations.
The R850MC is rated at 50 watts per channel into 8 ohms and 80 watts per
channel into 4 ohms. With the Stereo/Bridged mono switch in the Bridged
Mono position, both channels in the zone are combined for a higher powered
mono output. In bridged mode, the R850MC is rated at 140 watts of power
into a single 8 ohm load. All this power is backed by two high output torodial
transformers. Each amplier output channel incorporates robust protection
circuitry for safety and reliability under extreme circumstances.
Thermal Protection
All Russound ampliers are designed with special circuitry to safeguard the
amplier 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 amplier. If this fault occurs, turn o the
amplier, and check that the speaker impedance rating is above the minimum
rating. Also check for adequate ventilation around the amplier and make
adjustments if necessary.
Once the unit has cooled to safe operating temperatures, the amplier may
be powered back on.
Protection Circuitry
All Russound ampliers are designed with special circuitry to safeguard the
amplier under a short-circuit condition. A faulty speaker can also cause a short
circuit condition. The front panel LED illuminates orange when the amplier is
in short circuit protection. If this fault condition occurs, turn o the amplier
and check speakers for short circuit conditions when appropriate.
Rack Mounting
The R850MC amplier can be rack mounted using the included rack-mount
ears and hardware to attach the ears to the amplier. The amplier will take
three rack spaces with the feet removed.
Rev. 3
Russound R850MC Installation Manual
3
FRONT AND REAR PANEL
Zone LEDPower / Zone LED
R850MC Front Panel
Line/Bus Switch
Delay Time
Speaker Outputs
Stereo/Bridge Mono Switch
Line input
Gain Controls
12VDC Trigger in/out
Bus Input/Output
Power Switch
Fuse Receptacle
AC Input
R850MC Rear Panel
4 Russound R850MC Installation Manual Rev. 3
BACK PANEL FEATURES
Power LED
On start-up, the rst LED lights red to show power on. When the rst zone is
turned on, the LED lights green.
Zone LED
On start-up, zone LEDs are o (except Zone 1). When each zone powers on,
the corresponding LED lights green. When at least one zone is on, the rest
of the zone LEDs are red to show they are in standby mode. If a short circuit
happens on the speaker outputs, the LED will light amber.
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 ampliers in the
system.
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.
Line/Bus Switch
Sets the zone input to the Line Input or the Bus Input.
Speaker Outputs
The A and B speaker outputs are in parallel to the zone amplier 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, Speaker B only.
Gain Controls
Left and Right gain controls independently adjust the sound level for each
channel. When used in the bridged mode only the Left control is used.
Power Switch
Turns the amplier on/o. This switch does not disconnect the main power
feed from the amplier; this requires that the power cord be unplugged from
the outlet.
Fuse Receptacle
Holds a replaceable fuse for AC power input connection. Fuse rating for North
America is T10AL 250V and for Europe is T5AL 250V.
AC Input / Voltage Switch
Voltage is set with a selectable switch for 110V or 240V operation. The AC
voltage input for the North American model is 120VAC at 60Hz (European
model, 230VAC at 50Hz). This receptacle accepts a 3-prong IEC 320 type
connector. A detachable 3- terminal power cord is included.
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.
Delay Time
Muting delay can be adjusted from about 0.5 minute to 4.5 minutes. When
an audio signal is not present, the amplier will automatically go into standby
mode after the preset period of time.
Standby Mode
The amplier will go into Standby mode when no audio signal or trigger is
present, and after the minimum delay time has timed out. The amplier will go
into a 0.5 Watt or less standby power mode.
Stereo/Bridge Mono Switch
Sets each zone amplier for stereo or bridged mono operation.
Rev. 3
Russound R850MC Installation Manual
5
TYPICAL SYSTEM CONFIGURATION
R850MC
Amplifier
MCA-C5
Controller
Bridged
Independent Stereo
Bus Input
The R850MC can be congured as the main amplier for an audio distribution
system or home theater system.
When used with an audio distribution preamp, each zone can independently
drive one of several dierent 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 R850MC is used as a home theater amplier, three zones can be
bridged to provide high power for the front and center channels and the
remaining zone can be used for the surround eects.
Connections for audio distribution preamp outputs
6 Russound R850MC Installation Manual Rev. 3
Line I n L R
In
Speak er
A
Zone
1
L+
L-
R-
R+
L+
L-
R-
R+
Speak er
B
Line In
Bus In
D ela yTime
L
R
+
-
Ster e o
B r idg e Mono
Ster eo mode
4minimum
impedance
Bridge mode
8minimum
impedance
O ut Trigger In
12V 100m A
RCA Cable from source
Line I n L R
Bridg e
Bridg e
In
Speak er
A
Zone
L+
L-
R-
R+
L+
L-
R-
R+
Speak er
B
Line In
Bus In
D ela yTime
L
R
+
-
Ster eo
B r idg e Mono
Ster eo mode
4minimum
impedance
Bridge mode
8minimum
impedance
O ut Trigger In
12V 100m A
2
Left In
Right In
Right Speaker
8 ohm
(+)Positive
(-)Negative
Left Speaker
8 ohm
Speaker
cable
(+)Positive
(-)Negative
Speaker
cable
When the amplier is in Bridged mode operation, both the left and right
channels are combined for a higher power mono output.
For bridged amplier operation, turn o the power to the amplier and connect
an 8-ohm minimum load to the Speaker B output.
Following the Bridge mode markings in red on the back of the amplier:
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 amplier.
BRIDGED OPERATION
Rev. 3
Connections for bridged mode operation
Russound R850MC Installation Manual
7
TECHNICAL SPECIFICATIONS
R850MC Amplier
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, 8 channels at 8 ohms
50W per channel, 8 channels at 4 ohms
100W at 8 ohms, each zone bridged
Distortion THD+N: <0.05% 8 Ohm, 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 10kohms
Output Trigger: 12VDC 100 mA
Power Requirements: North American Model:
100-120VAC 60Hz 1000W
IEC 320 type connector with 3 terminal
detachable power cord.
Fuse Rating: T10AL 250V
Power Requirements: European Model:
220-240VAC 50Hz 1000W
IEC 320 type connector with 3 terminal
detachable power cord.
Fuse Rating: T5AL 250V
Standby Power: < 0.5 W
Dimensions: 17" W x 16.5"D x 5.875"H (43 x 42 x 15 cm)
Weight: 29.6 lbs. (13.4 kg)
The R850MC Amplier meets EU Standby Power Requirements
8 Russound R850MC Installation Manual Rev. 3
Warranty
The Russound R850MC Amplier is fully guaranteed against all defects in
materials and workmanship for two (2) years from the date of purchase. 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 owner’s expense and
with prior written permission. Accidental damage and shipping damage are
not considered defects, nor is damage resulting from abuse or from servicing
by an agency or person not specically authorized in writing by Russound.
This Warranty does not cover:
Damage caused by abuse, accident, misuse, negligence, or improper •
installation or operation
Power surges and lightning strikes•
Normal wear and maintenance•
Products that have been altered or modied•
Any product whose identifying number, decal, serial number, etc. has been •
altered, defaced or removed.
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 other 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.
Damage to or destruction of components due to application of excessive
power voids the warranty on those parts. In these cases, repairs will be made
on the basis of the retail value of the parts and labor. To return for repairs,
the unit must be shipped to Russound at the owner’s expense, along with a
note explaining the nature of service required. Be sure to pack the unit in a
corrugated container with at least three (3) inches of resilient material to
protect the unit from damage in transit.
WARRANTY
Before returning a unit for repair, call Russound at (603) 659-5170 for a Return
Authorization number. Write this number on the shipping label and ship to:
Russound
ATTN: Service
5 Forbes Road
Newmarket, NH 03857
Due to continual eorts to improve product quality as new technology and
techniques become available, Russound/FMP, Inc. reserves the right to revise
system specications without notice.
Rev. 3
Russound R850MC Installation Manual
9
NOTES
10 Russound R850MC Installation Manual Rev. 3
NOTES
Rev. 3
Russound R850MC Installation Manual
11
R850MC
4-Zone, 8-Channel Power Amplier
Installation Manual
©2010 Russound. All rights reserved.
All trademarks are the property of their respective owners.
Specications are subject to change without notice.
Russound is not responsible for typographical errors or omissions.
Russound, Inc.
5 Forbes Road, Newmarket, NH 03857
tel603.659.5170•fax603.659.5388
email: tech@russound.com www.russound.com
28-1169 Rev. 3 07/28/10
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