Allen&Heath 21 Series User Manual
Page 7
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Monitor Output:
stereo 1/4" jack socket
tip = left
ring = right
outer = earth
Normal Operating Level = +4dBv
Maximum Gain = +10dB
Headphones Output:
stereo 1/4" jack socket
capable of driving stereo phones of 4ohms
to 600ohms impedance
Tie Buss Svstem:
Stereo Input -
stereo 1/4" jack socket
tip = left
ring = right
outer = earth
Gain to Stereo Output = 0dB
Stereo Output - stereo 1/4" jack socket
Normal Operating Level = +4dBv
Mono Input - mono 1/4" jack socket
Gain to Mono Output = 0dB
Auxilliary Input - stereo 1/4" jack socket
tip = cue
ring = echo
outer = earth
Gain to Output = 0dB
Auxilliary Output - stereo 1/4" jack socket
Normal Operating Level = +4dBv
PFL Input - stereo 1/4" jack socket
Gain to PFL Output = 0dB
tip = audio
ring = DC
o u t e r = 0 V
DC connect to 0V = PFL activated
floating = PFL not activated
PFL Output - stereo 1/4" jack socket
Normal Operating Level = 4dBv
DC PFL activated = 0V
PFL not activated = -8VDC into 1MEGohm load
Metering:
illuminated VU meters 0VU = +4dBv
PFL Busy Indicator:
turns on when PFL is activated