Russound D250LS - Product Overview; Thermal Protection; Protection Circuitry

4 Russound D250LS Installation Manual Rev. 2
Introduction
The Russound D250LS is a 2-channel power amplier 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 dierent 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 amplier 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 amplier output channel incorporates robust protection
circuitry for safety and reliability under extreme circumstances.
Thermal Protection
All Russound ampliers are designed with special circuitry to safeguard the
amplier 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 amplier. 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
All Russound ampliers are designed with special circuitry to safeguard the
amplier 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.
PRODUCT OVERVIEW