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INTRODUCTION
The SM-500 Professional Bass Amplifier provides the power, performance, flexibility and portabili-
ty required by the professional bassist for every style of playing and nearly every playing situation.
To design an amplifier that would cover "all of the basses," SWR had to use almost every imagin-
able type of electronic component available. This added up to an all TUBE preamp section, a lim-
iter circuit utilizing Field Effect Transistors ("FETs"), tone and equalizer controls utilizing integrated
circuits, and two individual power amps employing discrete, solid state devices.
The power amplifiers in the SM-500 can be used individually to provide full stereo capabilities,
each delivering 250 watts into individual 4 ohm speaker enclosures. In the event that more power
is required, the amplifiers can be bridged for 400 Watts @ 8 ohms. The power amps are cooled
by a thermostatically controlled fan and the chassis is vented on its rear and right side.
The SM-500 also boasts a studio-oriented "side chain" effects loop allowing you to use an effects
unit while maintaining the constant clarity and naturalness of the instrument. The SM-500's Tuner
Out jack is also on a side chain. Remember when you had to unplug your bass from your amp and
hook into your tuner and frantically tune up between songs? Or install the tuner between your
instrument and amp, thus degrading sound quality? Those times are history!
The SM-500 is housed in an all aluminum chassis for light weight and lasting beauty and weighs
just 20 pounds. It is easily carried by the heavy-duty, chrome rack handles secured to the front
panel.
The tube employed in the preamp section of the SM-500 is a specially selected 12AX7 and
should not require replacement for one to three years.
To get the most out of your SM-500, please take the time to read through the entire owner's man-
ual.
SM-500 FRONT PANEL FEATURES
• Dual independent input jacks compatible for both active and passive instruments
• Gain Control with LED peak clipping indicator
• Variable Limiter Control
• Aural Enhancer Control
• Bass Control ±15dB cut/boost (shelving point: 80Hz)
6 • SM-500
SM-500 OWNER'S MANUAL
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