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X75
Dual Source Power Amplier
Installation Manual
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SAFETY INSTRUCTIONS
Cleaning - The apparatus should be cleaned only with 6.
a dry cloth.
Ventilation - Do not block any ventilation openings. 7.
Install in accordance with the manufacturer's
instructions. Slots and openings in the cabinet
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 PREVENT FIRE OR SHOCK
HAZARD, DO NOT EXPOSE THIS APPLIANCE TO
RAIN OR MOISTURE. THIS APPLIANCE SHALL
NOT BE EXPOSED TO DRIPPING OR SPLASHING
WATER AND THAT NO OBJECT FILLED WITH
LIQUID SUCH AS VASES SHALL BE PLACED ON
APPARATUS..
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 These Instructions - All the safety and operating 1.
instructions should be read before the appliance is
operated.
Keep These Instructions - The safety and operating 2.
instructions should be retained for future reference.
Heed All Warnings - All warnings on the appliance in 3.
the operating instructions should be adhered to.
Follow All Instructions - All operating and user 4.
instructions should be followed.
Water and Moisture - Do not use this apparatus 5.
near water; for example, near a bathtub, washbowl,
kitchen sink, laundry tub, in a wet basement, or near
a swimming pool.
are provided for ventilation and to ensure reliable
operation of the product and to prevent it from
overheating, and these openings must not be
blocked or covered. The openings should never be
blocked by placing the product on a bed, sofa, rug,
or other similar surface. This product should not be
placed in a built-in installation, such as a bookcase
or rack unless proper ventilation is provided or the
manufacturer's instructions have been adhered to.
Heat - Do not install near any heat sources such as 8.
radiators, heat registers, stoves or other apparatus
(including ampliers) that produce heat.
Grounding or Polarization - Do not defeat the safety 9.
purpose of the polarized alternating current line plug
or grounding-type plug. A polarized plug has two
blades with one wider than the other. This plug will
t into the power outlet only one way. This is a safety
feature. A grounding-type plug has two blades and
a third grounding prong. The wide blade or the third
prong are provided for your safety. If you are unable
to insert the provided plug into your outlet, contact
your electrician to replace the obsolete outlet.
Power Cord Protection - Protect the cord from 10.
being walked on or pinched particularly at plugs,
convenience receptacles, and the point where they
exit from the apparatus.
Attachments - Only use attachments/accessories 11.
specied by the manufacturer.
Carts and Stands - Use only with the cart, stand, 12.
tripod, bracket or table specied by the manufacturer,
or sold with the apparatus. When a cart
is used, use caution when moving the
cart/apparatus combination to avoid
injury from tip-over.
Non-Use Periods - Unplug this 13.
apparatus during lightning storms or
2 Russound X75 Installation Manual
when unused for long periods of time.
Servicing - Refer all servicing to qualied service 14.
personnel. Servicing is required when the apparatus
has been damaged in any way, such as power supply
cord or plug is damaged, liquid has been spilled or
objects have fallen into the apparatus, the apparatus
has been exposed to rain or moisture, does not
operate normally, or has been dropped.
MAINS Plug - The MAINS plug or an appliance coupler 15.
is used as the disconnect device, the disconnect
device shall remain readily operable.
Insulation - 16. Class II apparatus with double
insulation, and no protective earth provided.
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When installing the X75 Amplier, the clearances shown here MUST be kept
for proper ventilation of the amplier.
ClEARANCE REqUIREmENTS / TAblE OF CONTENTS
Table of ContentsClearance Requirements
Safety Instructions ..................................................................................................................2
Product Overview ..................................................................................................................4
Front and Rear Panels ............................................................................................................ 5
System Conguration - Stereo Mode ............................................................................... 6
System Diagram - Stereo Mode..........................................................................................7
System Conguration - Bridged Mode ............................................................................ 8
System Conguration - External Volume Controls ...................................................... 9
Technical Specications ......................................................................................................10
Warranty ...................................................................................................................................11
Russound X75 Installation Manual
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pROdUCT OVERVIEW
Introduction
The Russound X75 is a 2-channel dual source power amplier with autosource switching. It features two audio line inputs with a loop out to another
zone, receiver, or device from Line 2 source.
This amplier can be used for power upgrades in specic zones, for speaker
selector or volume control systems.
The X75 is a Class D amplier rated at 75 watts per channel into 4 ohms, and
60 watts into 8 ohms. With the Stereo/Bridge Mono switch in Bridge Mono
position, both amplier channels are combined for a higher powered mono
output. In Bridge mode the X75 is rated at 160 watts of power into a single
8 ohm load. Each amplier output channel incorporates robust protection
circuitry for reliability and safety.
Thermal Protection
All X Series ampliers are designed with special circuitry to safeguard the
amplier under a thermal overload condition. Thermal protection mode will
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. In thermal protection mode the amplier
will automatically stop output. 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
Special circuitry has been designed into the amplier to safeguard 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.
Installation
The X75 amplier can be placed on a shelf in an equipment rack, or on a table
or cabinet. Be sure to follow the required clearances shown on page 3 to allow
for ventilation and heat dissipation.
Front Panel Controls
On the front panel of the X75 amplier are the power button plus speaker
selector, a master balance and a master volume adjustment.
Power - the front panel switch will manually switch the power on or o.
Speaker selector - select speaker pair A (main) or speaker pair B (auxiliary) for
audio output. You can use speakers A and B together, as long as the speakers
are at a minimum 8-ohm impedance.
Balance - adjust speaker output balance between right and left channels. The
default setting is at center.
Volume - adjust the speaker output volume. If using Bridged mode, set the
volume at minimum, then adjust to the desired level.
Unswitched Outlet
The X75 amplier has a built-in outlet on the back panel. This 120 VAC outlet
provides 400W unswitched power for a device such as a small powered
subwoofer. This switch provides power as long as the X75 is plugged into an
outlet, whether or not the unit itself is powered on.
Manual / Auto On
The X75 amplier can be turned on manually or automatically by setting a
switch on the rear panel. For manual power on or o, press the Power button on
the front panel. For automatic power on, set the switch to Auto On, and place
the front panel power button in the "On" position. When music is sensed on
either input RCA connector, the amplier's signal sensing sends a command for
it to power on. Once the signal ends, the amplier turns o.
Speaker Cable
When connecting speakers to the X75 amplier, use a minimum 16 gauge
and maximum 12 gauge stranded copper cable. Avoid leaving stray strands
and keep polarity consistent.
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FRONT ANd REAR pANEl
Power button
Speaker selector
Primary Input
Secondary Input/Output
Stereo / Bridge Switch
Russound X75 Installation Manual
X75 Front Panel
Manual / Auto On switch
X75 Rear Panel
Balance control
Speaker 'A' Output
Speaker 'B' Output
Volume control
Unswitched outlet 120VAC
Fuseholder
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SYSTEm CONFIGURATION - STEREO mOdE
The X75 has dual source capability. If two sources are used, connect the source
you want to listen to most of the time to the Line 2 (secondary) input and the
source you listen to less constantly to the Line 1 (primary) input.
Whenever the Line 1 (primary) source becomes active, that signal will take
priority over the distributed audio signal on the Line 2 (secondary) input. The
signal remains active but not heard on the Line 2 input, and once the Line 1
audio signal is muted or turned o, the X75 will automatically switch back to
the Line 2 (secondary) audio signal.
Stereo Mode
Unplug the X75.1.
Set the Stereo/Bridge switch to Stereo.2.
Connect the audio line output from a stereo preamplier or source to the 3.
left and right Line 2 input jacks of the X75 (for secondary source).
Connect the audio line output from the primary source to the Line 1 input 4.
jacks in the same manner.
Connect your speakers to the terminals, observing proper polarity.5.
Restore power to the amplier. Use the front panel knobs for Balance and 6.
Volume adjustments.
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SYSTEm dIAGRAm - STEREO mOdE
X75 Amplier
Line Out
RCA Cable
Speaker Cables
8 ohm Speakers
Multiroom Controller (secondary source)
Line Out
RCA Cable
CD Player (primary source)
Stereo Mode Conguration with Dual Sources
(CD player is primary source)
Russound X75 Installation Manual
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SYSTEm CONFIGURATION - bRIdGEd mOdE
X75 Amplier
Line Out from source
(+) Positive Conductor
(-) Negative Conductor
8 ohm Speaker
Speaker Cable
Bridged Mode
In this mode both the left and right channels are combined for a higher power
mono output.
NOTE: The minimum impedance for the total load connected to a pair of
channels in the bridged mode is 8 ohms.
Unplug the X75. 1.
Set the Stereo/Bridge switch to Bridge Mono. 2.
Connect the line out from a preamplier or source to the Right channel Line 3.
2 input of the X75. Do not connect any input to the Left channel input.
On Speaker A, connect the negative lead (-) of the speaker cable to the 4.
L(+) terminal. Connect the positive lead (+) of the speaker cable to the R(+)
terminal. (See the Bridge markings on the terminals on the rear panel). An
8 ohm minimum load is recommended.
Restore power to the amplier. 5.
On the front panel, set the Balance to center, and set the Volume to Min 6.
(minimum). Adjust the output with the volume control to the desired level.
Bridged Mode Connection Detail
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Bridged Mode Conguration
Page 9
Line out from Source
X75 Amplier
INPUT
EXPANSIONS
SPEAKERS SPEAKERS
SPEAKERS SPEAKERS
RUSSOUND
INPUT
EXPANSIONS
SPEAKERS SPEAKERS
SPEAKERS SPEAKERS
RUSSOUND
Autoformer-based
Volume Control
EZB-1SC Modular
Connecting Block
IN
8 Ohm Speaker
Speaker Cable
Speaker Cable
Speaker Cable
Autoformer-based
Volume Control
IN
8 Ohm Speaker
Speaker Cable
Speaker Cable
System Conguration with External Volume Controls
The X75 can be congured for large autoformer-based volume control
systems/speaker selectors. Connect up to a total of four impedance matching
volume controls to the amplier on speaker A and/or B outputs (e.g., 4 on 'A'
and none on 'B', 2 on 'A', 2 on 'B', etc.)
The X75 has a minimum 4-ohm load in stereo mode, and minimum 8-ohm
load in bridged mode.
SYSTEm CONFIGURATION - EXTERNAl VOlUmE CONTROl
Conguration with Autoformer Volume Control
Russound X75 Installation Manual
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Page 10
TECHNICAl SpECIFICATIONS
X75 Amplier
Continuous Output Power: 60W per channel at 8 ohms
(<1.0% THD+N) @ 1kHz 75W per channel at 4 ohms
160W bridged mono at 8 ohms
Signal-to-Noise Ratio: 100dB A-weighted
Frequency Response: 10Hz to 30kHz +0.0dB/- 3.0dB @ 8 ohms, 1 W
Input Sensitivity: 900mV for 50W at 8 ohms
Crosstalk: > 70dB @ 1 kHz
Power Requirements: 120VAC 60Hz 4.2A
Dimensions: 16.5” W x 8”D x 2.5”H
(41.9 x 20.3 x 6.4 cm)
Weight: 10.4 lbs. (4.68 kg)
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Warranty
The Russound X75 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.
Russound X75 Installation Manual
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X75
Dual Source 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
28-1354 06/01/10
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