Russound P125 Installation Manual
P125 Dual Source Power Amplier
Installation Manual
SAFETY INSTRUCTIONS
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
1. Read Instructions - All the safety and operating
instructions 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.
6. 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 force and uneven
surfaces may cause the appliance and
cart combination to overturn.
7. 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.
8. 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.
9. Heat - The appliance should be situated away from
heat sources such as radiators, heat registers, stoves,
or other appliances (including ampliers) that
produce heat.
10. 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.
11. Grounding or Polarization - Precaution should be
taken so that the grounding or polarization means of
an appliance is not defeated.
12. 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.
13. Main Power Disconnect - The power switch is a singlepole 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.
14. Cleaning - The appliance should be cleaned only as
recommended by the manufacturer.
15. Non-Use Periods - The power cord of the appliance
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.
16. Object and Liquid Entr y - Care should be taken so that
objects do not fall and liquids are not spilled into the
enclosure through the openings.
17. 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.
18. 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.
2 Russound P125 Installation Manual
When installing the P125 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 - Basic Speaker Connection ..................................................... 9
System Conguration - External Volume Control ........................................................ 9
Technical Specications ......................................................................................................10
Warranty ...................................................................................................................................11
Russound P125 Installation Manual
3
PRODUCT OVERVIEW
Introduction
The Russound P125 is 2-channel dual source power amplier with autosource switching. Features Primary and Secondary audio line inputs with a loop
out to another zone, receiver, or device from the secondary source. A speakerlevel input can be connected and assigned as either the primary or secondary
source. This amplier can be used for power upgrades in zones for large speaker
selector or volume control systems.
The P125 is rated at 125 watts per channel into 4 ohms, and 80 watts into
8 ohms. Output channel incorporates robust protection circuitry for reliability
and safety under extreme circumstances.
With the Stereo/Bridge Mono switch in the Bridge Mono position, channels
are combined for a higher powered mono output. In Bridge mode the P125 is
rated at 250 watts of power into a single 8 ohm load.
The 12V Trigger In/Out allows each amplier 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
The P125 is 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. The amplier power must be cycled for
the unit to return to normal operation.
Installation
The P125 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 P125 amplier is 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.
Power LED indicator - RED = ON, RED = Standby. AMBER = 12V Trigger
switched on.
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 P125 amplier 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 amplier's
signal sensing sends a command for it to power on. Once the signal ends, the
amplier turns o in about 4 minutes. To turn the amplier 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 amplier.
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 ampliers, use a minimum 16 gauge and
maximum 12 gauge stranded copper cable. Avoid leaving stray strands and
keep polarity consistent.
4 Russound P125 Installation Manual
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