Product Overview - Russound X125 Installation Manual

PRODUCT OVERVIEW

Introduction
The Russound X125 and X225 are 2-channel dual source power amplifiers 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 amplifier 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 amplifier 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
amplifier 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 amplifier 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 amplifiers are designed with special circuitry to safeguard the
amplifier 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 amplifier. In thermal protection mode the amplifier
will automatically stop output. 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 temperatures, the
amplifier may be powered back on.
Protection Circuitry
Special circuitry has been designed into the amplifier to safeguard under a
short-circuit condition. A faulty speaker can also cause a short circuit condition.
If this fault condition occurs, turn off the amplifier and check speakers for short
circuit conditions when appropriate. The amplifier power must be cycled for
the unit to return to normal operation.
4
Installation
The amplifiers 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
amplifier to allow for ventilation and heat dissipation.
Front Panel Controls
On the front panel of the X125 and X225 amplifiers are the power button plus
speaker selector, balance and volume adjustment.
Power - the front panel switch will manually switch the power on or off.
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 amplifiers can be turned on manually or automatically by
setting a switch on the rear panel. For manual power on or off, 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 amplifier's
signal sensing sends a command for it to power on. Once the signal ends, the
amplifier turns off in about 4 minutes. To turn the amplifier 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 amplifier.
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 amplifiers, use a minimum 16 gauge and
maximum 12 gauge stranded copper cable. Avoid leaving stray strands and
keep polarity consistent.
Russound X125-X225 Installation Manual Rev. 1