6
microphone powering switches are set to 48 Phantom. This feature will conserve
approximately 12mA of supply current.
In the interest of keeping the M4mkII Mixer design simple and up to date with
today’s technology, we have not offered “12T” or “AB” microphone powering.
Although some “12T” microphones are still in existence, all new microphone
designs are 48PH.
D.
LOW CUT FILTERS
Each input channel of the M4mkII Mixer is equipped with an active low cut (high
pass) filter. These filters are activated via the three way switches located below
the adjacent channel fader knobs. These filters will attenuate all frequencies
below a preset frequency at a rate of 12dB per octave. When set at “20Hz”,
frequencies below 20 Hz are effectively rolled off with the mixer operating at full
frequency response. Optional low cut filter settings of 80Hz and 140Hz will roll
off the frequencies below these figures at a rate of 12dB per octave (-3dB level at
80Hz and 140Hz respectively. Low cut filtering is important in location recording
where wind noise can cause pre-amplifier overload. This effect can be
minimized by switching the low cut filter setting to either a 80Hz or 140Hz cutoff.
The low cut filter switches are located on the front of the M4mkII Mixer.
E.
CHANNEL GAIN
In order to limit noise and increase headroom, the channel fader controls are
located in the feedback path of the pre-amplifiers. This provides continuously
variable gain rather than just a decrease in channel output level when an
overload situation occurs. This results in increased headroom and lower chance
of signal clipping (severe distortion).
F.
CHANNEL PANS
The new M4mkII Audio Mixer contains front panel mounted pan pots. These pan
pots are used to route the individual input channel’s signal to either the left or
right summing buss. These pots are equipped with center detents allowing the
pots to remain centered when the operator so desires. These pots are also
equipped with a retracting mechanism that allows the pots to be pushed in flush
with the front panel after they have been set to the operators desired setting.
This helps keeps the front panel “clean” and uncluttered and reduces the chance
of the operator accidentally bumping the pan pot setting.
H.
BOOM POLE REMOTE CONTROL
The M4mkII Mixer offers the ability to remotely control the audio level of the
channel one input via a boom pole mounted remote control. When used, this
remote control works as a gain control for the channel one input. It allows the
operator to control the overall gain of the first preamp. To use this feature, you