Overview: The Russound R290DS is a 2-channel amplifier with
automatic source switching. It has Primary and Secondary line inputs, a
speaker-level input, and a line output from the primary source to another zone,
receiver, or audio device. The R290DS is rated at 90 watts per channel into 8
ohms, and 110 watts into 4 ohms. The speaker outputs can be bridged to a single
8-ohm load for an output of 220 watts.
System Configuration: The R290DS has dual source capability.
If two sources are used, you can connect the source you want to have priority to
the Primary input, and the other source to the Secondary input. Whenever the
Primary source is active, that signal takes priority over the audio signal on
the Secondary line. If the signal on the Secondary line is active, and when the
Primary source is muted or turned off, the R290DS will automatically switch to
the Secondary audio signal. The delay time knob lets you set the amount of time
it takes (between 3-15 seconds) for the amplifier to switch between the Primary
and Secondary source when the Primary source is muted or turned off.
Speaker Level Input: If a source is connected to the Speaker
Level input, it can be set to Primary or Secondary. When set to Primary, it has
priority over the Secondary Line input, but not to the Primary Line input. When
set to Secondary, the speaker level input only becomes active if the Primary and
Secondary Line inputs are muted or turned off.
Bridged Operation: When the amplifier is in bridged mode
operation, both the left and right channels are combined for a high-powered mono
output. For bridged amplifier operation, connect the speaker's positive lead to
the amplifier's Left Positive terminal, and the negative lead to the amp's Right
Positive (-) terminal. A minimum 8-ohm load is recommended for bridged
operation. Note: The two-way Stereo/Bridge switch on the back of the
amplifier should be switched to the "Bridge Mono" position.
Left/Right Channel Level Controls: The amplifier has
individual rotary level controls for the left and right channels. The left
channel knob also controls the bridge mode level.
Thermal Protection: The Russound 2-channel amplifier is designed with
special circuitry to safeguard the amplifier 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 amplifier.
Protection Circuitry: This Russound amplifier is designed with special
circuitry to safeguard the amplifier under a short-circuit condition. A faulty
speaker can also cause a short circuit condition. The front panel LED
illuminates orange when the amplifier is in short circuit protection.
Rack Mounting: The R290DS can be rack mounted using the
supplied rack-mounting ears and hardware. The amplifier will take two rack
spaces (2U) when the feet are removed. One open rack space above and below the
amplifier is recommended to allow for ventilation and heat dissipation.
Power LED: The amplifier's front panel LED will illuminate red when the power is
on and the amplifier is in default/standby mode and illuminate green when the
amplifier is active. If the amp detects a short circuit, the LED will glow
orange and go into protection mode.
Power Switch: The amplifier's power switch turns the unit on and
off. This switch, however, does not disconnect the main power feed from the
amplifier; this requires that the power cord be unplugged from the AC
Level Controls: The amplifier features left and right gain control
to independently adjust the sound level for each channel. When in bridged
mode, only the left control is used.
Delay Time: The amplifier's delay time can be adjusted from
approximately 3 to 15 seconds. When no audio signal is present on the
Primary Line input (or Speaker Level input set to Primary),
the amplifier will automatically switch to the Secondary input
after the preset period of time.
Stereo/Bridge Mono Switch: This switch sets the pair of amplifier
channels for stereo or bridge mono operation.
Power: The amplifier can be switched between 120V AC
and 240V AC operation.
12VDC Trigger In/Out: The 12V Trigger In (3.5mm) controls the
amplifier switching from the default input (distributed audio system) to a
local source. The Trigger Out (3.5mm) provides 100mA 12V max. can be used to
drive other 12V trigger devices.
Secondary Line Input: The amplifier's Secondary stereo
RCA audio input only becomes active when the source connected to the Primary
Line input is turned off or muted.
Speaker Level Input: The speaker level input consists
of a 4-pin screw-terminal module that can be removed for connecting the
speaker wire. Using the 2-way switch, you can set the Speaker Level Input to
Secondary or Primary operation.
Primary Line Input: The Primary Line stereo RCA input
takes priority over the Secondary input, as well as the Speaker Level input
(no matter the setting), as long as the connected source is active and
Speaker Outputs: The left and right speaker outputs use
5-way binding post terminals, which accept single and dual banana plugs,
spade connectors, pin connectors, and bare speaker wire. For bridged
operation, the left positive and right positive terminals are used.
AC Input: The AC voltage input is 120VAC at 60Hz. This receptacle
accepts a 3-prong IEC 320 type connector. A detachable 6', three-conductor power
cord is included.