Controlling multiple amplifiers with one volume controller
Several MPA 401 units can be
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.
Extron | Extron |
VCM 100 AAP | MPA 401 |
| daisy chain |
VOL/MUTE |
10V |
REMOTE
10V 
50mA
V | C | G |
REMOTE
10V 
50mA
V | C | G |
REMOTE
10V 
50mA
V | C | G |
OR
| VOL/MUTE |
10V | 50mA |
| VOL/MUTE |
10V | 50mA |
| VOL/MUTE |
10V | 50mA |
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 | 8 |
