Analog I/O & the AD Input Section 39
02R96—Owner’s Manual
4 Analog I/O & the AD Input Section

AD Input Section

The 02R96 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 52).
They can also be patched to Output Channel Insert Ins (see page 55).

AD Input Connectors (AD 1–16)

AD Inputs 1 through 16 feature balanced XLR-3-31-type connectors and bal-
anced 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 connector is disconnected.

AD Input Connectors (AD 17–24)

AD Inputs 17 through 24 feature balanced 1/4-inch phone jacks, with a nom-
inal input range of –34 dB to +10 dB. They can also be used with unbalanced
phone plugs.

Phantom Power (AD 1–16)

AD Inputs 1 through 16 feature switchable +48 V phantom powering for use
with condenser-type microphones and direct boxes. Phantom power is sup-
plied to the balanced XLR-3-31-type connector, and can be switched individ-
ually for each AD Input.

Pad (AD 1–16)

AD Inputs 1 through 16 feature pad switches, which attenuate input signals by
26 dB, allowing the Head Amps to work with high-level signals. Pad is typi-
cally 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 (+10 dB to –34 dB
for AD Inputs 17–24). The GAIN controls adjust the gain of the Head Amps,
allowing you to optimize input signal levels for the best signal-to-noise perfor-
mance. Ideally, the GAIN control should be set so that the signal level is rela-
tively 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 con-
trol 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 nominal. The PEAK indicator lights up when
the input signal level is 3 dB below clipping.
ON
OFF
+48V
26dB
GAIN 34
10
+
-16 -60
GAIN
AD Inputs 1–16
AD Inputs 17–24
PEAK
SIGNAL