Yamaha DM2000 4 Analog I/O & the AD Input Section

64 Chapter 4—Analog I/O & the AD Input Section
DM2000 Version 2—Owner’s Manual
4 Analog I/O & the AD Input Section
AD Input Section
The DM2000 features 24 AD Inputs for connecting microphone and line-level sources.
AD Inputs can be patched to Input Channels or Input Channel Insert Ins (see page 77).
They can also be patched to Output Channel Insert Ins (see page 80).
AD Input Connectors
AD Inputs feature balanced XLR-3-31-type connectors and balanced 1/4-inch
phone jacks, both with a nominal input range of –60 dB to +10 dB. The phone
jacks, which can also be used with unbalanced phone plugs, have priority over
the XLR-type connectors, so when a phone plug is inserted, the XLR-type con-
nector is disconnected.
Phantom Power
AD Inputs feature switchable +48 V phantom powering for use with con-
denser-type microphones and direct boxes. Phantom power is supplied to the
balanced XLR-3-31-type connector, and can be switched individually for each
AD Input.
Pad
AD Inputs feature pad switches, which attenuate input signals by 26 dB, allow-
ing the Head Amps to work with high-level signals. Pad is typically used to
attenuate “hot” signals from bass or snare drum microphones, or “hot”
line-level signals.
Gain
AD Inputs feature detented rotary gain controls with an input sensitivity of –16
dB to –60 dB, or +10 dB to –34 dB when the Pad is on. The GAIN controls
adjust the gain of the Head Amps, allowing you to optimize input signal levels
for the best signal-to-noise performance. Ideally, the GAIN control should be
set so that the signal level is relatively high, and it’s okay for the PEAK indicator
to light up occasionally. If the PEAK indicator lights up often, however, you
should back off the GAIN control a little, otherwise, signal clipping may occur.
If the GAIN is set too low, the signal-to-noise performance will suffer.
PEAK & SIGNAL Indicators
These indicators are used in conjunction with the GAIN controls and PAD
switches to optimize signal levels. The SIGNAL indicator lights up when the
input signal level is 20 dB below the rated level. The PEAK indicator lights up
when the input signal level is 3 dB below clipping.
ON
OFF
+48V
PAD
26dB
-16 -60
GAIN
PEAK
SIGNAL