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SM-500 USER GUIDE • 9
The frequency response of the SM-500 is far greater than usually found in musical instrument ampli-
fiers (10 Hz to 40kHz). This was engineered in order to give the bass player the same punch and
clarity on stage as found in the studio or concert PA systems. Therefore, it is doubly important that
you be aware of the impedance and power rating of the speakers that you intend to use and that they
are compatible with the SM-500.
Note: Make sure your speakers can handle the power provided by the SM-500 in the
Mono/Bridge mode. Speakers that have been overdriven are easy to detect and generally do
not fall under a manufacturer’s warranty.
EFFECTS SECTION
Both Mono and Stereo Effects Loops are provided on the SM-500. It should be noted, though, that
both cannot be used simultaneously. Always use high quality shielded patch cables for all connec-
tions between the amplifier and your effects units. Also, it is recommended that the cables be as
short as possible.
The Gain control acts as an effects send level control. The amount of signal present at the Effects
Send jack is governed by the Gain control on the front panel. If your effects unit is overloading and it
does not provide for compensating incoming signals (such as an input volume or switches marked +4
or –10, for example), you may turn down the Gain control to avoid the overloading. If your effects unit
has input level adjustments, they should be set for either 0 dB or +4 dB.
The Stereo Master Volume control may be used to recover losses in gain caused by some effects
units.
Use the Effects Blend control to adjust the amount of effect with the natural signal from your instru-
ment. No sound from your effects unit will be heard if the Effects Blend control is in the fully counter-
clockwise (“dry”) position.
To use the
mono Effects Loop, run a shielded patch cable from the SM-500’s “Send” jack to the
INPUT of your effects unit. Run a second patch cable from the OUTPUT of your effects unit to the SM-
500’s mono effects return jack. Then adjust the Effects Blend control for the mix you desire.
To use the stereo Effects Loop, run a patch cable from the Effects SEND jack to the mono input of
your stereo effects unit. This generally is either the left or right input of the unit (check your owners
manual). If for some reason your effects unit does not provide a mono input, purchase a “Y” mono
cord from your local music or electronics store. Plug the common end in the effects Send jack and
the other two ends in the left and right inputs of your effect.
If you wish to use just the internal power amps in the SM-500, the Effects Return jacks will serve as
the “inputs.” Insert your MONO signal source in the
mono Effects Return jack. This will send the
source to both power amps. If you have a stereo source, plug the left and right outputs into the cor-
responding Effects Return jacks. If you want to use just one side of the amp, use the LEFT CHANNEL
ONLY. This is because the thermostat that regulates the fan is located on the left side.
TUNER OUT
The Tuner Out jack allows the user to connect an instrument tuner and tune up without having to
unplug and go back and forth from amp to tuner. This feature is totally isolated from the rest of the
preamp and will function regardless of the settings of any control on the front panel. Being on a side
chain (isolated) also avoids loading down of the instrument causing a loss in dynamic range.
To use this feature, plug in a shielded patch cord from the Tuner Out to the INPUT on your tuner. Turn
the amplifier on and you're ready to go. If you do not wish to monitor your sound while tuning up, set
the Speaker On/Off switch to the “Off” position.