m
101
page
7
uSING THE TRIM CONTROL
The trim control can be used for fine output level adjustment as well as for level riding during recording. The
trim control can add an additional 10dB of gain for a total maximum preamplifier gain of 75dB. If the trim control
is not needed for riding gain or providing extra gain boost then it should be left at zero (fully counter clockwise).
uSING RIBBON MIC MODE
Pushing the ribbon switch does three things: +48V phantom power is locked-out to prevent potential damage
to ribbon microphones, the impedance of the mic input is raised from 8.1k Ohms to 20k Ohms, and the 48V DC
blocking input capacitors are bypassed with sealed gold contact relays.
The maximum gain available on the m101 is 75dB, which is achieved by setting the gain control to 60dB and the
trim to 10dB. For recording low level sources with ribbon microphones, the m101 has ample available gain, suf-
ficient for even the most demanding low-level recording scenarios.
Note that if the +48V phantom power is on and then the ribbon mode is engaged there will be a momentary
delay before the m101 enters ribbon mode. This is because the m101 logic circuitry waits for the +48V at the mic
input to discharge before enabling ribbon mode. Likewise, if you are in ribbon mode and the +48V switch is on,
then phantom power will turn on immediately if the ribbon mode switch is released. In general it is best practice
to turn off the +48V phantom power before entering ribbon mode.
The ribbon mode on the m101 is also ideal for many dynamic mics.
uSING THE HpF
The high pass filter, sometimes referred to as a bass roll-off, starts at 75Hz. This 12dB/octave filter is optimized
for minimum phase shift. The most common uses for this are in situations where low-end rumble from mechani-
cal sources or wind are present, to reduce excessive proximity effect, or to simply help reign in excessive bass
during recording.
RACKMOuNTING THE m101
The m101 chassis has a #10-32
threaded insert mounting hole
on the bottom towards the back.
Two m101s can be mounted side
by side in a standard 1U rack tray.
Use a #10-32 x 1/2” or a #10-32 x
3/8” machine screw. Do not use a
screw longer than 1/2”.
mounting hole
chassis underside
