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Controlling multiple ampliers with one volume controller
Several MPA 401 units can be daisy-chained so that one volume controller can
simultaneously regulate the volume of all the amplifiers.
NOTES:
• Asadditionalamplifiersareaddedtothedaisychain,thesensitivityofthe
volumepotentiometerwillchange.Themaximumvolumelevel(fullyclockwise)
willnotbeaffected.Howevertheeffectivenessoftheminimumvolumelevel
(fullycounterclockwise)inreducingthevolumetoinaudiblelevelsdecreasesas
moreamplifiersareaddedtothedaisychain.
• WhenmorethantwoMPAsareattachedtothechain,soundmaybegintobe
heardevenifthelevelshavebeensettotheirlowest.Themutingoftheoutput
howevercanberemediedwithacontactclosurebuttonattachedbetweenthe
Vol/MuteandGroundpinofthefirstMPAinthechain.
To regulate multiple amplifiers with a single volume controller, follow these instructions:
1. Attach all three pins of the volume controller to the corresponding pins on the first
MPA401 unit only (ground to ground; Vol/Mute to Vol/Mute; and 10 V to 10 V).
2. Use jumper wires to connect the Vol/Mute pins of the first amplifier and each
successive amplifier.
3. Use jumper wires to connect the ground pins of the first amplifier and each
successive amplifier.
10V
VOL/MUTE
Extron
VCM 100 AAP
Extron
MPA 401
daisy chain
VCG
10V 50mA
REMOTE
VCG
10V 50mA
REMOTE
VCG
10V 50mA
REMOTE
10V
VOL/MUTE
50mA 10V
VOL/MUTE
50mA10V
VOL/MUTE
50mA
OR
Figure 5. Regulating Multiple Amplifiers with a Single Volume Controller
NOTE: The 10V pin of the volume controller connects to the first MPA 401 only.
There are no jumper wires linking it to subsequent amplifiers.
MPA 401-70V and MPA 401-100V • Rear Panel and Cabling 8