ATI Audio MX100 User Manual
Page 6
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HEADPHONES
A front panel 1/4” TRS jack and thumbnail-adjust gain control provides a monaural, in
phase signal to both sides of a set of stereo headphones. Only stereo headphones should
normally be used with the MX100; however, mono phones can be used in a pinch at
reduced levels. The headphone output provides 100mW to phones of up to 600-ohm
impedance and reduced levels into higher impedance phones. On the MX101, a panel
switch can select a split listening mode which allows a prefade listen feed to one ear
either from mixer 1 or from an external directors cue fed thru a rear 2.5mm Tip - Sleeve
jack. Inserting a plug into the rear cue jack interrupts the feed from mixer 1. The cue
headphone level is adjusted with an internal trimpot, R84 and is not affected by the front
panel headphone level adjustment.
LED METERING
A ten segment, three colors LED bargraph display meters the output with a VU average
response characteristic. Internal meter calibration pot, R70, sets the 0VU meter reference
to +4dBm output level and is adjustable to read 0VU for outputs from -10 to +8dBm.
COMPRESSOR/ LIMITER
The MX101 and the MX100C incorporate a low distortion optical compressor with a
front panel switch and peak indicating LED. The compressor threshold adjustment, R76
is factory set for a sine wave threshold at +3VU meter indication. The threshold setting is
independent of the actual mixer output level.
SLATE MICROPHONE AND TEST TONE OSCILLATOR
The MX101 includes a sensitive slate mike built into the front panel with a momentary
switch to activate it. The compact nature of the MX101 precluded a slate mike level
adjustment.
A 740Hz low distortion test tone oscillator is selected by the maintained up position of
the same panel switch. The oscillator is injected into the mixing buss at the optimum
level to set your master control for 0VU (+4dBm out). A bi-color LED lights to tell you
that funny sound in the mix is the test tone oscillator you forgot to turn off.
EXPANSION INPUT
Loop-thru 1/8" T-S (Tip - Sleeve) jacks, J7 (and J8) mounted on the rear panel feed the
mixing buss at the input of A4A. This point floats at half the supply voltage and must not