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MPA 152 Amplier • Installation
2-13
Controlling multiple amplifiers with one volume controller
Several MPA 152 units can be daisy-chained so that one volume
controller can simultaneously regulate the volume of all the
ampliers.
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.
To regulate multiple ampliers with a single volume controller,
follow these instructions:
1. Attach all three pins of the volume controller to the
corresponding pins on the rst MPA 152 unit only (ground
to ground; Mute/Vol to Mute/Vol; and 10 V to 10 V).
2. Use jumper wires to connect the Vol/Mute pins of the rst
and each successive amplier.
3. Use jumper wires to connect the ground pins of the rst and
each successive amplier.
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