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D250LS
2-Channel Power Amplier with Local Source Switching
Installation Manual
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2 Russound D250LS Installation Manual Rev. 2
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.
Retain Instructions - The safety and operating instructions
2.
should be retained for future reference.
Heed Warnings - All warnings on the appliance in the
3.
operating instructions should be adhered to.
Follow Instructions - All operating and user instructions
4.
should be followed.
Water and Moisture - The appliance should not be used near
5.
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 service p ersonnel
for inspec tion.
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.
Ventilation - The appliance should be situated so that
7.
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.
Heat - The appliance should be situated away from heat
8.
sources such as radiators, heat registers, stoves, or other
appliances (including ampliers) that produce heat.
Grounding or Polarization - Precaution should be taken so
9.
that the grounding or polarization means of an appliance is
not defeated.
Power Cord Protection - Power supply cords should be
10.
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.
Power Sources - The appliance should be connected to a
11.
power supply only of the type described in the operating
instructions or as marked on the appliance.
Main Power Disconnect - The power switch is a single-pole
12.
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.
Non-Use Periods - The power cord of the appliance should
13.
be unplugged from the outlet when left unused for a long
period of time.
Attachments - Only use attachments/accessories specied
14.
by the manufacturer.
Carts and Stands - The appliance should
15.
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.
Wall or Ceiling Mounting - The appliance should be
16.
mounted to a wall or ceiling only as recommended by the
manufacturer.
Location of the Amplier - Do not mount this unit under a
17.
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.
Object and Liquid Entr y - Care should be taken so that
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objects do not fall and liquids are not spilled into the
enclosure through the openings.
Servicing - The user should not attempt to service the
19.
appliance beyond that described in the operating
instructions. All other servicing should be referred to
qualied service personnel.
Damage Requiring Service - The appliance should be
20.
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.
CAUTION: TO REDUCE THE RISK OF ELECTRIC
SHOCK, DO NOT REMOVE THE COVER. NO USERSERVICEABLE PARTS INSIDE. REFER SERVICING
TO QUALIFIED SERVICE PERSONNEL.
WARNING: TO REDUCE THE RISK OF FIRE
OR ELECTRIC SHOCK, DO NOT EXPOSE THIS
APPLIANCE TO RAIN OR MOISTURE.
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 har mful 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.
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Russound D250LS Installation Manual
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Introduction
The Russound D250LS is a 2-channel power amplier with automatic local
source switching capability. The D250LS 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 dierent applications.
The D250LS is rated at 50 watts per channel into 8 ohms and 75 watts per
channel into 4 ohms. With the Stereo/Bridge Mono switch in the Bridge Mono
position, both amplier channels are combined for a higher powered mono
output. In bridged mode the D250LS is rated at 150 watts of power into a single
8-ohm load. 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. If this fault condition occurs, turn o the amplier and
check speakers for short circuit conditions when appropriate.
PRODUCT OVERVIEW
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Russound D250LS Installation Manual
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FRONT AND REAR PANEL
Speaker Outputs
Fuse Receptacle
Line Input
Delay Time
Gain Controls
Stereo/Bridge Switch
D250LS Rear Panel
12VDC Trigger in/out
D250LS Front Panel
Power Switch / LED
AC Input
Video Input
Default Input
Amplied In
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FRONT AND BACK PANEL FEATURES
Power LED
On start-up, the rst LED lights red to show power on. When the amplier
goes into standby, the LED will light amber.
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.
Line Input
The Line audio input is a sensing input that will activate the amplier when
an audio signal from a source is present. Only the Left input is used for bridged
mode operation.
Video Input
The Video Input is a sensing input that activates the D250LS when a video
signal is present.
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.
Delay Time
Muting delay can be adjusted from about 5 seconds to 4.5 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.
12VDC Trigger In/Out
The 12V Trigger In controls the amplier 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.
Stereo/Bridge Mono Switch
Sets the pair of amplier channels for stereo or bridged mono operation.
Default Input
Default Input is a pass-through input for the whole-house system. If no signal
is input to the "Line In" or the "Amplied In," the Default input will be connected
directly to the A and B speaker output.
Amplied In
The amplied In is a sensing input that is used to amplify a high-level signal
from a small amplier or TV.
Speaker A/B Outputs
The A and B speaker outputs are in parallel to the amplier output. The
minimum 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 impedance
for bridged mode operation is 8 ohms, Speaker B only.
Fuse Receptacle
Holds a replaceable fuse for AC power input connection. Fuse rating for North
America and for Europe is T3.15AL 250V.
AC Input
The autoswitching AC voltage input for the North American model is 100-125
VAC at 60Hz (European model, 220-240VAC at 50Hz). This receptacle accepts
a 3-prong IEC 320 type connector. A detachable 3- terminal power cord is
included.
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Russound D250LS Installation Manual
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INSTALLATION OPTIONS
The D250LS amplier can be set on a tabletop or wall-mounted with screws
or hook and loop tape. Rack-mounting ears are included to install either one
D250LS in a 1U space or two units in a 1U space.
Wall Mounting
The amplier comes with two wall mounting brackets and attachment
screws. There are two attachment locations on each side of the amplier for
more mounting options. Hook and loop tape can be used as well.
Rack Mounting
The rack mounting ears support either one or two amps in a single rack
space.
To install one amplier in a rack space, use the long ear and one of the wallmount brackets. The unit can be mounted either to the left or right side of the
rack space.
For two units in one rack space, use the at plate to support and connect
them, and use one wall-mount bracket on each outer side of the units.
When using the two-unit mounting option, the small side ventilation slots on
the amps will be next to one another in the middle of the rack space. To avoid
overheating situations, make sure the copious top panel ventilation holes are
not blocked.
Wall mounting option
Single unit rack mounting option
Dual unit rack mounting option
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LOCAL SOURCE SYSTEM CONFIGURATION
Connections for local source override of whole-house system
A/V RCA Cables
4-8 Ohm Speakers
Speaker
Cable
D250LS Amplifier
Amplified output
to room speakers
Line Outputs
Video
Right
Left
Amplified input
from audio
distribution system
Optional video sensing
Local Source (TV)
The D250LS can be used as a single-source two-channel zone amplier, or
as a local-source amplier that automatically 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 oce).
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Russound D250LS Installation Manual
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Connections for bridged mode operation
BRIDGED OPERATION
RCA Cable from source
Left In
8 Ohm Speaker
(+)Positive
(-)Negative
Speaker
Cable
D250LS Amplifier
When the amplier is in bridged mode operation, both the left and right
channels are combined for a higher powered 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 only and restore power to the amplier.
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8 Ohm Speaker
(+)Positive
(-)Negative
Speaker Cable
D250LS Amplifier
D250LS Amplifier
Connections for bridged mode operation
Connections for normal operation
4-8 Ohm Speakers
MCA-C5 Controller
RCA Cable
RCA Cable
The D250LS can be used in a side-by-side conguration using the optional
rack mounting kit. This feature makes it easy to add amplication to two
controllers or two zones (e.g., on the MCA-C5 controller).
The example shown features two D250LS amps connected to an MCA-C5,
zones 7 and 8. One amp adds power through bridged mode for an outdoor
zone. The other amp powers a pair of speakers in a zone for normal operation.
DUAL UNIT SETUP
Conguration showing 2 D250LS Ampliers using optional rack mount kit
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Russound D250LS Installation Manual
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D250LS Amplier
Continuous Output Power: 50W per channel at 8 ohms
(<0.3% THD+N) @ 1kHz 75W per channel at 4 ohms
150W at 8 ohms, 2 channels bridged
Distortion THD+N: <0.3% from 20Hz to 20kHz for 50W into 8 ohms
<0.05% from 20Hz to 20kHz for 1W into 8 ohms
Signal-to-Noise Ratio: >112dB A-weighted
Channel Separation: >60dB @ 1 kHz
Frequency Response: 20Hz to 20KHz +/- 0.4dB
Input Sensitivity: 70mV for 1W at 8 ohms
550mV for 50W 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 and European Models:
(Autoswitching Power Supply) 100VAC to 240VAC 50/60Hz 2.5A
IEC 320 type connector with 3 terminal
detachable power cord
Fuse Rating: T3.15AL/250V
Standby Power: <0.5 Watts
Dimensions: 8.5" W x 10.5" D x 1.75" H
(21.59 x 26.67 x 4.45 cm)
Weight: 4.65 lbs. (2.1 kg)
The D250LS Amplier meets EU Standby Power Requirements
TECHNICAL SPECIFICATIONS / WARRANTY
Warranty
The Russound D250LS 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.
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.
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Russound, Inc.
5 Forbes Road, Newmarket, NH 03857
tel603.659.5170•fax603.659.5388
email: tech@russound.com www.russound.com
28-1357 Rev. 2 11/10/10
©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.
D250LS
2-Channel Power Amplier
with Local Source Switching
Installation Manual
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