Sound-devices 722 User Manual download pdf (Page 17)

722 User Guide and Technical Information

limiters will prevent unusually high input signal levels from clipping the analog input stage of

the preamp. The front panel LIM LED ( ) shows that the limiter is engaged. Limiter activity is

indicated by additional front panel LEDs, one for each input channel ( ). The input limiters are

active only with mic-level inputs. The limiters are engaged by (factory) default.

When limiters are engaged, audio on channels 1 and 2 is limited to -6 dBFS.

Microphone Level Control

Microphone gain is controlled by the front panel recessed knobs. The gain control adjusts an analog

gain stage and functions similarly to the input trim on a mixing console or stand-alone microphone

preampliﬁer. Gain is controllable over two ranges, normal and low.

Gain Range (microphone-level only)

The microphone inputs operate in four gain ranges, normal, normal fades to off, low,

and low fades to off. The normal range controls input gain from 24.3 dB to 67.4 dB of gain.

The low range controls input gain from 9.3 dB to 52.4 dB. The low ranges are useful for high

SPL recording environments. The fade to off options allow for fader-like control of your gain.

Normal fades to off provides a gain range of off or 0 to 67.4 dB and low fades to off pro-

vides a gain range of off or 0 to 52.4 dB.

High-Pass Filters (microphone-level only)

The high pass ﬁlters on the microphone inputs use a combination of analog and digital ﬁlters to re-

duce sensitivity to low frequency signals. When the high-pass is engaged on an input, its front-panel

LED illuminates to indicate it is active ( ). The ﬁrst pole of the high-pass circuit is an analog ﬁlter

at 40 Hz, 6 dB per octave and is part of the microphone preampliﬁer circuit. Additional poles of

high-pass ﬁltering are done in DSP.

Several frequency and slope combinations are selectable, including corner frequencies of 40, 80, 160,

or 240 Hz, and ﬁlter slopes of 12 dB, 18 dB, or 24 dB per octave. The high-pass is selected for each

input independently.

Shortcut: The ﬁlters can be toggled with a two-key combination. Press and hold the LCD back-

light key and press the menu key for channel 1 high-pass. Press and hold the LCD backlight

key and press the HDD key to toggle channel 2 high-pass. The high pass ﬁlters are linked when

the inputs are linked. (See Input Linking)

Line-Level Gain Control

When in line-level position, the gain for inputs 1 and 2 is controlled by the front panel recessed

potentiometers or by a menu sensitivity setting. When set for front panel control in the user menu,

Line Input 1: Gain and Line Input 2: Gain controls in the user menu are lined out and not ac-

cessible.

Input Linking (Stereo or MS Decoding)

Analog inputs 1 and 2 can be linked as a stereo pair. When linked, the channel 1 front panel potenti-

ometer controls the signal level of both inputs, and the channel 2 pot controls the left-to-right balance

of the pair. When the inputs are linked, their peak limiters are linked, as well.

When set to link as an MS pair, the inputs are decoded as left/right stereo, where the gain and bal-

ance for the pair work the same as stereo linking above. Input 1 is for Mid signal, input 2 for Side

signal.

When the inputs are linked, phantom power and the high pass ﬁlters also act as linked pairs. Engag-

ging and disengaging phantom power or the high pass ﬁlters on input one will force the same func-

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Sound-devices 722 User Manual Page 17

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