Momentum MMA 300 - Manual (Page 13)

ADJUSTING YOUR SYSTEM.
When installing the system, you can not use both the RCA inputs and the High Level Speaker inputs at the same time. You must choose one
method or the other. Never run your RCA cables on the same side of the vehicle as your power and ground wires. This will help avoid any
electrical noise from getting into your system. It is recommended that you use high quality, shielded RCA cables.
To properly set your amplifier level control, turn the amplifier level control to 5 volts (minimum) and your head unit to maximum volume.
Begin to turn the amplifier gain towards 150mV until you to hear the music begin to distort. At that point turn the gain back a drop towards 5
volts and your system is set. The amplifier gain/level setting is not a volume control-it is a sophisticated circuit meant to match the preamp
voltage of your signal source to the amplifier preamp circuit. Setting the amp gain to maximum when not necessary-will increase the
chance of noise and distortion entering your system.
SETTING YOUR CROSSOVER
It is important to remember not to set the Low Pass crossover below the roll off frequency of your subwoofer box. For example, if your box rolls
off at 60Hz, don’t set the LP crossover to 45Hz, typically you should set the crossover one full octave above the roll off frequency. LP=LOW
PASS, this allows only low bass frequencies to be played and filters out all high frequencies from the subwoofer. HP=High Pass, this allows only
high frequencies to be played and filters out all low frequencies from reaching typically smaller midranges and tweeters which can be
damaged from powerful low frequency signals. HP=HIGH PASS, this means that the amplifier is playing in the full range mode without any
frequencies being filtered.
The Bass Boost Circuit will add 12dB of boost at 45Hz. Use this equalization processor to properly tailor the bass to your in car response.
Please be sure that your speakers can handle the increased 12dB of output before turning on the circuit. You may want to reduce the
amplifier gain so that you do not bottom out your drivers when testing the Bass Boost circuit.
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