Corp. Amplifier USER GUIDE SM-900

SM-900 USER GUIDE • 13
effects returns (i.e., one cable from the “High” out jack to the Left stereo effects return, and one
cable from the “Low” out to the Right stereo effects return). In this configuration, connect your
low end speakers (woofers) to the Right speaker output jacks, and your high end speakers
(midrange/tweeters) to the Left speaker output jacks. Use the Balance control on the front panel
to even out the highs and lows (see diagram on page 19).
Note: The Effects Blend control must be in the fully “wet” position. If not, you will be getting
full- range signals sent to your power amps and NOT the signals sent by the electronic
crossover. Similarly, the Power Amp Assign switch MUST be in the “Stereo” position.
An effects unit may be placed in between each of the Crossover Out jacks and the Stereo Effects
Return jacks. This allows you to run an effect for just the lows or highs (or both) using multiple
stereo effects units. The MONO effects return is BEFORE (PRE) the electronic crossover circuit.
This allows the user to insert a mono effects unit that will be sent to both the Low and High out-
put jacks.
A diagram showing proper connections for bi-amp operation appears on page 19.
EFFECTS LOOP
Both Mono and Stereo Effects Loops are provided on the SM-900, though it should be noted that
both cannot be used simultaneously. Always use high quality shielded patch cables for all connec-
tions between the amplifier and your effects units. We recommend that the cables be as short as
possible.
The amount of signal present at the Effects Send jack is determined by the setting of the Gain
control on the front panel. If your effects unit is overloading and it does not provide for compensat-
ing incoming signals (such as an input volume, or switches marked +4 or –10), you may turn down
the Gain control to avoid this condition. If your effects unit has input level adjustments, they
should be set for either 0dB or +4dB.
The Master Volume may be used to recover losses in gain caused by some effects units.
Use the Blend control to adjust the amount of “effects” with the natural signal from your instru-
ment.
Note: You will not hear any sound from your effects 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 “Send” jack of the SM-900 to
the input of your effects unit. Run a second patch cable from the output of your effects unit to the
mono effects return jack. Now adjust the Effects Blend control for the mix you desire.
To use the stereo Effects Loop, run a patch cable from the “Send” jack of the SM-900 to the mono
input of your stereo effects unit (either the left or right input—check the effects unit and/or its
owners manual). If your effects unit does not provide a mono input, get 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 (see diagram, page 20).
If you wish to use just the internal power amps in the SM-900, 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 corresponding Effects Return Jacks. If you want to use just one side of the amp, use the LEFT
CHANNEL ONLY (the thermostat that regulates the fan is located on the left side).
STEREO/BRIDGE POWER AMP ASSIGN SWITCH
To run your amplifier in the stereo mode, move the Power Amp Assign Switch to the “Stereo” (top)
position. You will need to use the speaker outputs marked “Left” and “Right.” To run the SM-900