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as it could further damage your amp and void your warranty.
The fuses can open if there is a fault in the speaker cable or the speakers themselves. Therefore,
it is wise to carry extra fuses at ALL TIMES.
SPEAKER OUTPUT JACKS
Unlike most amplifiers on the market, all SWR amplifiers can be used for recording purposes using only
the XLR Balanced out, and without speakers connected to the speaker output jacks.
Note: If you are using only one channel (in stereo mode), use the left channel speaker output as
the thermal sensor for the fan is located on the left heat sink.
When used in the stereo mode, the internal power amplifiers of the SM-900 will deliver 500 watts per
side into 2 ohms, 400 watts per side into 4 ohms, and 240 watts per side into 8 ohms. For
optimum performance, we recommend using a total of 4 ohms per channel. When using 2 ohm loads,
the amplifier will run hotter than normal and the internal fan will be running most of the time. Minimum
speaker load in the stereo mode is 2 ohms per side.
When used in Bridge Mode, the SM-900 will deliver 440 watts into 16 ohms, 650 watts into 8 ohms
and 900 watts into 4 ohm loads. Please make sure the speakers you use in this mode can handle the
power. Minimum load in Bridge Mode is 4 ohms.
LEFT & RIGHT SPEAKER JACKS
There are two 1/4" jacks and one Speakon
section. The Left and Right speaker jacks are provided for use in the Stereo Mode only. DO NOT use
these jacks when the SM-900 is switched to the Bridge Mode. Balance between left and right channels
can be obtained by using the Stereo Master Volume control located on the front panel. Make sure all
speakers are connected BEFORE turning on the SM-900. Never plug or unplug your speakers while the
playing through the amplifier.
SPEAKER CABLE
Speaker cable should be made of 18-gauge, or heavier, wire. (The thicker the wire, the lower the
gauge, so 18-gauge is heavier than 20-gauge and so on.) Do not use instrument cables to hook up
your speakers. This can result in intermittent power loss, cause your power amp to oscillate and
damage itself (and/or your speakers), and render the cables useless for any purpose.
BRIDGE MODE SPEAKON
The Speakon
jack located directly below the Power Amp Assign switch (in the center of the Speaker
®
Output Section) is provided for use in the Bridge Mode only. A six foot speaker cable (Speakon-to-
Speakon) is provided with the SM-900 for your convenience. Please make sure that all connections are
complete before turning the SM-900's power switch to the "On" position.
GENERAL AMP & SPEAKER TIPS
Make sure your speakers can handle the power provided by the SM-900 in Bridge/Mono mode.
Speakers that have been overdriven are easy to detect and generally do not fall under a manufacturer's
warranty.
In order to give bassists the same punch and clarity found in the studio or in concert PA systems, the
SWR SM-900 was designed with a frequency response far greater (20Hz to 40kHz) than that generally
found in musical instrument amplifiers.
14 • SM-900 USER GUIDE
jack provided for each side of the SM-900's output
®
JACK
®
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