6
OPERATION
Automatic Turn-On Selection:
The KMA series offers two different automatic turn-on modes that can
be selected on the end panel; +12V and DC Offset. Using the DC Offset mode causes the REM wire to
have +12V out for turning on additional amplifi ers.
• Remote Turn-On: Set the switch to +12V to use the remote turn-on lead from your source unit. Run
18 gauge wire from the Remote Turn-On Lead on your source unit to the blue REM wire on KEY
amplifi er’s wiring harness. This is the preferred automatic turn-on method.
• If 12V remote turn-on is not available, DC Offset turn-on can be used if speaker-level (high-level)
audio inputs are being used. The DC offset mode detects a 6V DC offset on the speaker wires when
the source unit has been turned on.
Input Level:
The RCA inputs on KICKER KMA amplifi ers are capable of receiving either Hi or Low-level
signals from your source unit. If you are using a Hi-Level signal, simply press in the Input Level switch on
the amplifi er. Refer to the wiring section of this manual for additional instructions.
Crossover Control:
The variable crossover on the side of the amplifi er allows you to adjust the
crossover frequency of AMP3
(KMA450.6 only)
to OFF, hi-pass, or lo-pass from 50–200Hz, and the hi-
pass crossover frequency of AMP1 & AMP2 from OFF-200Hz. OFF will pass a full-range signal, HI will cut
off frequencies below a threshold, and LO will cut off frequencies above a threshold.
Input Gain Control:
The input gain control is not a volume control. It matches the output of the source
unit to the input level of the amplifi er. Turn the source unit up to about 3/4 volume (if the source unit goes
to 30, turn it to 25). Next, slowly turn (clockwise) the gain on the amplifi er up until you can hear audible
distortion, then turn it down a little.
Bass Boost Control:
The variable bass boost control on the side of the amplifi er is designed to give you
increased output, 0–12dB, at 40Hz. The setting for this control is subjective. If you turn it up, you must
readjust the input gain control to avoid clipping the amplifi er.
Remote Level KMARC (KMA450.6):
With the included KMARC remote level control, you have the
ability to control the output level of the amplifi er remotely. To surface-mount the KMARC remote level
control, simply screw the remote to the chosen location, then run the cable from the controller to the
“Remote” jack on the amplifi er panel. See page 7 for installation.
REMOTE LEVEL not available with KMA150.2 and KMA300.4
