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1. MAIN OUTPUTS—MIC-level: Two XLR connectors used as a direct feed to mixing console mic inputs. Pin 2 is “+” positive, pin 3 is “–” negative, and pin 1 is signal ground.
2. MAIN OUTPUTS—LINE-level: Two 1/4" TRS (Tip-Ring-Sleeve) connectors deliver the Main A & B Line Level Outputs. No surprises here: the tip is “+” positive, the ring is “–” negative and the sleeve is signal ground.
3. MAIN OUTPUTS MONO button: Engaging this pushbutton combines or Monoes the Main A & B Output.
4. EXPAND IN A & B jacks: Two unbalanced 1/4" TS jacks used to expand the AP 13. These inputs sum (pre-Main Level control) with the Main A & B signals. Mono expansion is done using only the EXPAND IN A jack. As long as nothing is plugged into the B jack, the signal from EXPAND A automatically drives EXPAND B. These jacks also provide an auxiliary input path.
5. INSERT loop A & B jacks: Two unbalanced 1/4" TRS jacks wired per the tip=send, ring=return convention. Allows placing an outboard signal processor in series with the main signal paths.
6. RETURN A & B jacks: Two unbalanced 1/4" TS jacks used as the return path from the OUTPUTS of an outboard signal processor. Mono signals use only the RETURN A jack. As long as nothing is plugged into the B jack, the signal from RETURN A automatically drives RETURN B.
7. SEND A & B jacks: Two unbalanced 1/4" TS jacks used to connect to the inputs of an outboard signal processor. Mono effects units should wire only to the SEND A jack.
8. PIEZO OUTPUT: An unbalanced 1/4" TS jack gives a direct dry Output signal from the Piezo Pickup only. The PIEZO PICKUP OUT slider controls the amount of signal; however, since this Output is located after the PIEZO PICKUP LEVEL slider, then LEVEL also controls this Output.
9. TUNER OUTPUT: An unbalanced 1/4" TS jack used for direct tuner connection, fed by the PIEZO input. Located post EQ but pre-LEVEL, this Output is unaffected by either the LEVEL or OUT controls. For convenience, the tuner may be left connected during performances.
10. Ground lift switch: provides the ability to separate chassis ground and signal ground. Normally, this switch should be in the “grounded” position. In some circumstances, moving it to the opposite position eliminates hum and buzz problems.
11. Remote power supply input: This unit is supplied with a Rane RS 1 Remote AC Power Supply (RAP) suitable for connection to this input jack. The power requirements call for an 18 VAC center-tapped transformer. This is not a telephone jack. Never use a power supply other that the one supplied or a replacement approved by Rane. Using any other type of supply may damage the unit and void the warranty.
12. MIC PHANTOM POWER switch: controls the voltage used to power an electret or other condenser mic pickup. Front panel LEDs indicate one of the three positions of this switch.
13. Chassis grounding screw: A #6-32 screw is used for chassis grounding purposes. See CHASSIS GROUNDING below.

CHASSIS GROUNDING NOTE
If after hooking up your system it exhibits excessive hum or buzzing, there is an incompatibility in the grounding configuration between units somewhere. Here are some things to try:

1. Try combinations of lifting grounds on units that are supplied with ground lift switches or links.
2. If your equipment is in a rack, verify that all chassis are tied to a good earth ground, either through the line cord grounding pin or the rack screws to another grounded chassis.
3. Units with outboard power supplies do not ground their chassis through the line cord. Make sure that these units are grounded either to another chassis which is earth grounded (such as the amplifier), or directly to the grounding screw on an AC outlet cover.

Please refer to RaneNote 110, “Sound System Interconection” (included in the AP 13 manual) for further information on system grounding.