User`s manual

-0!!MPLIlERs)NSTALLATION
2-13
Controlling multiple amplifiers with one volume controller
3EVERAL-0!UNITSCANBEDAISYCHAINEDSOTHATONEVOLUME
CONTROLLERCANSIMULTANEOUSLYREGULATETHEVOLUMEOFALLTHE
AMPLIlERS
N
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.
N
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.
4OREGULATEMULTIPLEAMPLIlERSWITHASINGLEVOLUMECONTROLLER
FOLLOWTHESEINSTRUCTIONS
1 !TTACHALLTHREEPINSOFTHEVOLUMECONTROLLERTOTHE
CORRESPONDINGPINSONTHElRST-0!UNITONLYGROUND
TOGROUND-UTE6OLTO-UTE6OLAND6TO6
2 5SEJUMPERWIRESTOCONNECTTHE6OL-UTEPINSOFTHElRST
ANDEACHSUCCESSIVEAMPLIlER
3 5SEJUMPERWIRESTOCONNECTTHEGROUNDPINSOFTHElRSTAND
EACHSUCCESSIVEAMPLIlER
10V
VOL/MUTE
50mA10V
VOL/MUTE
50mA 10V
VOL/MUTE
50mA
10V
VOL/MUTE
Extron
VCM 100 AAP
Extron
MPA 152
daisy chain
Figure 2-9 — Controlling multiple amplifiers with
one volume controller