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Control Panel
Features
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8. Power LED – If you have connected your battery power, vehicle
ground, and turn-on lead (or GTO™ signal sensing) correctly, then
this light should turn on to indicate the power is ON.
9. Protection LED – The ACM-4.300 amplifier has built in diagnostic
codes to tell you exactly what is going wrong should the amplifier
detect a problem. If the protection LED should come on, read the
flashing
codes quickly before turning off the system and investi-
gating. (See the specs page for a list of diagnostic codes.)
10. GTO™ Signal Sense – In the ON position, the ACM-4.300 amplifier
will turn on gracefully when it detects an incoming audio signal,
and it will turn off after a period of time when the audio signal
fades away to silence. In some situations, factory installed audio
systems may turn on or “wake up” due to convenience features
like door chimes, alarms, and cell phone signals that trigger the
source unit in the vehicle to come on. To prevent these from
turning your audio system on unexpectedly, you can bypass the
GTO™ circuit by moving the switch to the OFF position and use
a switched 12-volt signal connected to the Remote In terminal
instead.
11. High Pass Crossover Frequency – Since component speakers
(like woofers) are designed to reproduce certain frequency ranges,
a crossover allows you to match the speaker to the appropriate
frequency range. Most manufactures list a recommended cross-
over frequency as part of the speaker specifications. Choosing
the correct crossover point will provide increased speaker
reliability and optimum sound quality. The ACM-4.300 amplifier
has selectable 12 dB/Octave Linkwitz-Riley crossover points at
80 Hz, 120 Hz, and a “bypass” option. The amplifier receives the
frequency range above the crossover point. Select the crossover
frequency on the ACM-4.300 amplifier to best match the value
specified by your loudspeaker’s manufacturer. If you do not know
this value, select the position that suits your system best.
