Connections
The M-1A operates at line level and is de-
signed to be the last component in the chain
before the power amplier. Connections to
the M-1A should be made according to the
diagram above.
1. Signal inputs to the M-1A may be either
balanced or unbalanced. For best sig-
nal-to-noise ratio, the average input level
should be at least 1 volt RMS. The M-1A
will accept peak inputs of up to +26 dBv
balanced, or +20 dBv unbalanced.
2. The Sub input is used only when the M-
1A is operated in conjunction with Meyer
Sound B-2, B-2A or B-2AEX subwoofer
Controllers.
3. SpeakerSense™ connections are made
from the output of the power amplier
back to the M-1A Sense inputs. The Hi
output of the power amplier must be
connected to the Hi Sense input, and the
Lo output of the power amplier to the Lo
Sense input in order for the SpeakerSense
driver protection circuitry to operate prop-
erly.
Note. Polarity of these connections does not
matter.
4. Signal outputs from the M-1A may be
either balanced or unbalanced. The max-
imum output levels before clipping are
+26 dBv balanced, +20 dBv unbalanced.
5. Connections between the power amplier
outputs and the Meyer Sound loudspeaker
used with the M-1A should be made ac-
cording to the instructions for the particular
loudspeaker (UPA-1C or UM-1C). These
connections must be veried for correct
polarity, and correct channel assignment
(Hi to Hi, Lo to Lo). Color codes given
in the diagram are those used for Meyer
Sound cables and adapters.
Note. The grounding strap on the M-1A rear
panel connects circuit ground (signal com-
mon) to earth ground (U-ground). Lifting this
strap from the terminal block disconnects
circuit ground from earth ground (the chas-
sis remains connected to U-ground). If hum
problems occur, this feature may be used to
control ground loops in the system.
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General