Russound X125 User manual

X125 - X225
Dual Source Power Ampliers
Installation Manual

2 Russound X125-X225 Installation Manual Rev. 1
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 sucient 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 operating1.
instructions should be read before the appliance is
operated.
Retain Instructions - The safety and operating2.
instructions should be retained for future reference.
Heed Warnings - All warnings on the appliance in the3.
operating instructions should be adhered to.
Follow Instructions - All operating and user4.
instructions should be followed.
Water and Moisture - The appliance should not5.
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.
SAFETY INSTRUCTIONS
Carts and Stands - The appliance should6.
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.
Location of the Amplier - Do not mount this unit7.
under a kitchen cabinet. Do not expose the amplier
to direct sun light or heating units as the amplier
internal components’ temperature may rise and
shorten the life of the components. Avoid damp and
dusty places.
Ventilation - The appliance should be situated so8.
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.
Heat - The appliance should be situated away from9.
heat sources such as radiators, heat registers, stoves,
or other appliances (including ampliers) that
produce heat.
Power Sources - The appliance should be connected10.
to a power supply only of the type described in
the operating instructions or as marked on the
appliance.
Grounding or Polarization - Precaution should be11.
taken so that the grounding or polarization means of
an appliance is not defeated.
Power Cord Protection - Power supply cords should12.
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.
Main Power Disconnect - The power switch is a single-13.
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.
Cleaning - The appliance should be cleaned only as14.
recommended by the manufacturer.
Non-Use Periods - The power cord of the appliance15.
should be unplugged from the outlet when left
unused for a long period of time. To remove all power
(supply mains) from the appliance, remove the plug
from the wall outlet.
Object and Liquid Entry - Care should be taken so that16.
objects do not fall and liquids are not spilled into the
enclosure through the openings.
Servicing - The user should not attempt to service the17.
appliance beyond that described in the operating
instructions. All other servicing should be referred to
qualied service personnel.
Damage Requiring Service - The appliance should be18.
serviced by qualied 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 USER-
SERVICEABLE 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.

3
Russound X125-X225 Installation Manual
Rev. 1
Safety Instructions .................................................................................................................. 2
Product Overview .................................................................................................................. 4
Front and Rear Panels ............................................................................................................ 5
System Conguration - Stereo Mode............................................................................... 6
System Diagram - Stereo Mode.......................................................................................... 7
System Conguration - Bridged Mode............................................................................ 8
System Conguration - External Volume Control........................................................ 9
Technical Specications......................................................................................................10
Warranty ...................................................................................................................................11
TABLE OF CONTENTS

4 Russound X125-X225 Installation Manual Rev. 1
Introduction
The Russound X125 and X225 are 2-channel dual source power ampliers with
auto-source switching. Each features Primary and Secondary audio line inputs
with a loop out to another zone, receiver, or device from the secondary source.
A speaker-level input can be connected and assigned as either the primary or
secondary source. This amplier can be used for power upgrades in zones for
large speaker selector or volume control systems.
The X125 is rated at 125 watts per channel into 4 ohms, and 80 watts into 8
ohms. The X225 is rated at 225 watts per channel into 4 ohms, and 150 watts
into 8 ohms. Each amplier output channel incorporates robust protection
circuitry for reliability and safety under extreme circumstances.
With the Stereo/Bridge Mono switch in the Bridge Mono position, both
amplier channels are combined for a higher powered mono output. In Bridge
mode the X125 is rated at 250 watts of power into a single 8 ohm load, and the
X225 is rated at 470 watts of power into a single 8 ohm load.
The 12V Trigger In/Out allows each amplier to be activated by other devices
or to activate other electronics via a 3.5 mm mini phone plug cable, with 100mA
current capability.
Thermal Protection
All X Series ampliers are designed with special circuitry to safeguard the
amplier 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 amplier. In thermal protection mode the amplier
will automatically stop output. If this fault occurs, turn o the amplier, and
check that the speaker impedance rating is above the minimum rating. Also
check for adequate ventilation around the amplier and make adjustments
if necessary. Once the unit has cooled to safe operating temperatures, the
amplier may be powered back on.
Protection Circuitry
Special circuitry has been designed into the amplier 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 amplier and check speakers for short
circuit conditions when appropriate. The amplier power must be cycled for
the unit to return to normal operation.
PRODUCT OVERVIEW
Installation
The ampliers can be placed on a shelf in an equipment rack or on a table
or cabinet. Be sure to leave at least 2 inches of space around each side of the
amplier to allow for ventilation and heat dissipation.
Front Panel Controls
On the front panel of the X125 and X225 ampliers are the power button plus
speaker selector, balance and 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.
Power On - Manual, Auto, Remote
The X125 and X225 ampliers can be turned on manually or automatically by
setting a switch on the rear panel. For manual power on or o, set the switch to
Normal and press the Power button on the front panel. For automatic power on,
set the switch to Auto On. When music is sensed on any input, the amplier's
signal sensing sends a command for it to power on. Once the signal ends, the
amplier turns o in about 4 minutes. To turn the amplier on remotely, set
the switch to Trigger and connect a 3.5mm phone plug remote triggering wire
from the device to the 12V Trigger In on the amplier.
NOTE: The front panel Power button must be in the "On" position for the 12V
trigger and Auto On features to work.
Speaker Cable
When connecting speakers to the ampliers, use a minimum 16 gauge and
maximum 12 gauge stranded copper cable. Avoid leaving stray strands and
keep polarity consistent.

5
Russound X125-X225 Installation Manual
Rev. 1
FRONT AND REAR PANEL
12V Trigger
In / Out
Delay
Time
Speaker Level Input
(Spring Connector)
Primary Input
Stereo/Bridge
Switch
Voltage
Selector
Power Inlet /
Fuseholder
Secondary Input/Output
Speaker Level Line
Input Switch
Speaker Output
Right/Left
Channel
Controls
Power button Speaker selector Balance control Volume control
X125 Front Panel
X125 Rear Panel
Power Option
Switch

6 Russound X125-X225 Installation Manual Rev. 1
Stereo Mode (Single Source)
The X125 and X225 can be congured as a power upgrade for specic zones,
for use with large speaker selectors, and for long parallel speaker runs (outdoor
zones). For a single source connection:
Unplug the amplier.1.
Set the Stereo/Bridge switch to Stereo.2.
Connect the audio line output from a stereo preamplier or source to the3.
left and right Secondary input jacks of the amplier. If the output is only
available as speaker level see "Speaker Level Signal" section below.
Connect your speakers to the terminals, observing proper polarity.4.
Restore power to the amplier. Both channel levels can be adjusted with5.
the corresponding channel level adjustments.
Dual source connections
The X125 and X225 have dual source capability. If two sources are used,
connect the source you want to take temporary priority to the Primary input
and the other constant source to the Secondary input.
Whenever the primary source becomes active, that signal will take priority
over the distributed audio signal on the secondary line. The signal is still active
on the secondary line but will not be heard, and once the primary audio signal
is muted or turned o the amplier will automatically switch back to the
secondary audio signal. For dual source connections:
1. Connect the source audio outputs to both Primary and Secondary inputs
as instructed above.
2. Set the switching delay with the Delay Time knob. This adjustment
determines the length of time it takes to switch back to the secondary signal.
For example, if the primary source is a CD changer, increasing the delay time
will prevent a switch back to the secondary source while the disc is changing.
Note: This works with all incoming signals, line level or speaker level.
Speaker Level Signal
If you have a source that is only available as a speaker level signal, connect it to
the Speaker Level Input terminals, using the spring loaded terminal block and
observing proper polarity. Only one set of speaker level inputs can be utilized
and assigned by the selector switch.
SYSTEM CONFIGURATION  STEREO MODE
Set the switch to Primary or Secondary. This forces the input to act as either
the primary or secondary input.
Only one type of input (speaker or line) should be assigned to each input.
When using the Speaker Level Input, and it is switched to the Secondary
position, the high-level signal will not pass to the Secondary Line RCA output.

7
Russound X125-X225 Installation Manual
Rev. 1
SYSTEM DIAGRAM  STEREO MODE
Stereo Mode Conguration with Dual Sources
(CD player is primary source)
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8 Russound X125-X225 Installation Manual Rev. 1
SYSTEM CONFIGURATION  BRIDGED MODE
Bridged Mode
In this mode both the left and right channels are combined for a higher power
mono output. For proper operation, the Master Level left and right channel
adjustment on the back panel should be set to the center position to start and
then adjusted appropriately from there.
Unplug the amplier.1.
Set the Stereo/Bridge switch to Bridge Mono.2.
Connect the line out from a preamplier or source to the Left and Right3.
Primary input jacks of the amplier.
Connect the negative lead (-) of the speaker cable to the R(+) terminal.4.
Connect the positive lead (+) of the speaker cable to the L(+) terminal. (See
the markings above the terminals on the rear panel). An 8 Ohm minimum
load is recommended.
Restore power to the amplier.5.
Be sure to equally adjust the Master Level right and left.6.
Bridged Mode Conguration
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Bridged Mode Connection Detail

9
Russound X125-X225 Installation Manual
Rev. 1
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System Conguration with External Volume Control
The X125 and X225 ampliers can be congured for large autoformer-based
volume control systems or speaker selectors. Connect up to eight (total)
impedance matching volume controls to the amplier on speaker A and B
outputs (e.g., 8 on 'A' and none on 'B', 4 on 'A', 4 on 'B', etc.)
Conguration with Autoformer Volume Control
SYSTEM CONFIGURATION  EXTERNAL VOLUME CONTROL
Each amplier has a minimum 4-ohm load in stereo mode, and minimum
8-ohm load in bridged mode.

10 Russound X125-X225 Installation Manual Rev. 1
TECHNICAL SPECIFICATIONS
X125 Amplier
Continuous Output Power: 80W per channel at 8 ohms
(<0.2% THD+N) 125W per channel at 4 ohms
250W bridged mono at 8 ohms
Signal-to-Noise Ratio: >93dB A-weighted
Crosstalk: > 70dB @ 1 kHz, ref. to rated power @ 8 ohms
Frequency Response: 20Hz to 20kHz +0.0dB/- 0.5dB @ 8 ohms, 1W
Input Sensitivity: 500mV for 80W at 8 ohms
Power Requirements: 120VAC 60Hz
230VAC 50Hz
IEC 320 type connector with 3 terminal detachable power cord.
Dimensions: 16.5”W x 13.75”D x 3.5”H
(41.9 x 34.9 x 8.9 cm)
Weight: 25.6 lbs. (11.52 kg)
X225 Amplier
Continuous Output Power: 150W per channel at 8 ohms
(<0.2% THD+N) 225W per channel at 4 ohms
470W bridged mono at 8 ohms
Signal-to-Noise Ratio: >93dB A-weighted
Crosstalk: > 70dB @ 1 kHz, ref. to rated power @ 8 ohms
Frequency Response: 20Hz to 20kHz +0.0dB/- 0.5dB @ 8 ohms, 1W
Input Sensitivity: 500mV for 150W at 8 ohms
Power Requirements: 120VAC 60Hz 10A
230VAC 50Hz 5.2A
IEC 320 type connector with 3 terminal detachable power cord.
Dimensions: 16.5”W x 13.75”D x 5.25”H
(41.9 x 34.9 x 13.3 cm)
Weight: 34.2 lbs. (15.4 kg)