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CHAPTER 5: THE MM-10ACX SUBWOOFER
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NOTE: The Input Select switch is only included
on the MM-10ACX model. The switch only
affects the subwoofer signal and has no effect on the
Satellite Outs.
The Input Select Switch and Summing
When the Input Select switch is in the up position (SUM
CH 1 + 2), the source signal that is routed to the subwoofer
from the Satellite Audio Ins is attenuated.
■ If audio signals are present at both Satellite Audio Ins,
the signal is summed and attenuated by 6 dB, resulting
in a net gain of 0 dB.
■ If only a single audio signal is present at one of the Satel-
lite Audio Ins, the signal is also attenuated by 6 dB. But
this time the result is a net gain of -6 dB.
THE MM-10ACX GAIN KNOB
The Gain knob adjust the subwoofer signal from completely
attenuated to +10 dB and can be used to the balanced the
subwoofer output with that of the satellite loudspeakers.
The Gain knob is always active, regardless of the Input
Select switch setting.
NOTE: The Gain knob is only included on the
MM-10ACX model. The knob only affects the
subwoofer signal and has no effect on the Satellite
Outs.
THE MM-10ACX INPUT POLARITY SWITCH
The Input Polarity switch swaps the polarity of the audio
source signal, which is sometimes necessary to acoustically
align the subwoofer with other loudspeakers in the system.
When the switch is in the up (+) position, pin 2 is hot relative
to pin 3, resulting in a positive pressure wave when a posi-
tive signal is applied to pin 2. When the switch is in the
down (–) position, pin 3 is hot relative to pin 2, resulting in a
positive pressure wave when a positive signal is applied to
pin 3.
NOTE: The Input Polarity switch only affects
the subwoofer signal. It has no effect on the
Satellite Outs.
THE MM-10ACX LIMIT LED
The MM-10ACX has a three-color Limit LED on its rear panel
that changes color to indicate the subwoofer’s status.
Powering On (Green)
When powering up the MM-10ACX subwoofer, the following
startup events occur and are indicated by the Limit LED:
1. The LED flashes green and then yellow during power up.
2. The LED turns solid green indicating the subwoofer is
ready to reproduce audio.
MM-10ACX Gain Knob
MM-10ACX Input Polarity Switch
MM-10ACX Limit LED