M-Audio DMP3, Руководство пользователя

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Low-Cut Rumble Filter
When foot movements, mic stand noise, or other low frequency sounds are
unwanted, use the DMP3 Low-Cut filter to reduce or remove them. The
DMP3 uses a 3-pole filter, attenuating the signal 75Hz and below at the rate
of 18dB per octave.
A “Low Cut” switch is provided on the front panel of the DMP3. Pressing
and locking this switch to the ‘In’ position will engage the low pass filter,
indicated by the lit low cut filter LED.
Phase Inversion
It is possible, with a stereo configuration (2-channel) or when two
microphones are recording one instrument, for the two signals to become
"out of phase" with each other. When similar signals are out of phase, they
tend to cancel each other out, greatly reducing signal level. Engaging just
one of the DMP3 Phase Inversion switches will remedy this situation. If you
suspect that your two channels are out of phase, simply switch phase reverse
for one of the channels and see if the sound suddenly ‘comes alive.’
Phantom Power
Unlike dynamic microphones, condenser microphones need to receive a DC
voltage (generally 48v) from an external source before they can generate an
output signal. If the condenser mic doesn’t come with its own power supply,
then "Phantom Power" must be applied from the pre-amp. Pressing the
"Phan" button and engaging phantom power on the DMP3 will send the
necessary voltage to both of the XLR Mic Inputs. Phantom power will not
affect a dynamic mic adversely, so its okay to have a dynamic mic at the XLR
input while phantom power is switched on. Just to be safe, check you mic’s
documentation to see if it will accept or needs phantom power.
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