Effects Loop

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.

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

SM-900 USER GUIDE • 13