Yamaha DM2000 Owner's Manual - Page 62
wAnalog I/O & the AD Input AD Input
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48 Chapter 4-wAnalog I/O & the AD Input Section 4 wAnalog 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 61). They can also be patched to Output Channel Insert Ins (see page 64). 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 connector is disconnected. Phantom Power +48V ON OFF AD Inputs feature switchable +48 V phantom powering for use with condenser-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 PAD 26dB AD Inputs feature pad switches, which attenuate input signals by 26 dB, allowing 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 -16 -60 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 PEAK switches to optimize signal levels. The SIGNAL indicator lights up when the SIGNAL input signal level is 20 dB below nominal. The PEAK indicator lights up when the input signal level is 3 dB below clipping. DM2000-Owner's Manual