Sound-devices 302 User Manual download pdf (Page 8)

302 User Guide and Technical Information

v. 3.6 Features and specifications are subject to change. Visit www.sounddevices.com for the latest documentation.

Inputs

The 302’s inputs consist of three, full-featured microphone preampliﬁers. Each input has a wide gain

range to accommodate nearly all signal types. The 302 easily accepts signals from low-sensitivity

ribbon and dynamic microphones, medium-level wireless and condenser mic outputs, and “hot”

line-level signals.

The XLR inputs of the 302 are transformer-balanced. The isolation characteristics of transformers are

superior to other balancing techniques and are ideal for the hostile and uncontrolled environments

of ﬁeld production. Transformers provide galvanic isolation from the driving source, meaning there

is no direct electrical connection. Signals are “transformed” magnetically. The input transformers in

the 302 use premium magnetic core material to achieve high signal handling capability (especially at

low frequencies) while keeping distortion to a minimum. Because of their inherently high common

mode impedance, transformers are unrivaled by any other type of input for common-mode noise

rejection.

The inputs of the 302 can be used as balanced or unbalanced. When unbalancing, ground pin-3

to pin-1 of the XLR connector. There is no change in gain between unbalanced and balanced

connections into the 302.

Mic/Line Level Selection

Selects the general input level for each input channel. Switch between Mic/Line levels using

the switch adjacent to the respective XLR input. Taking into account all gain stages, the 302

has 75 dB of available gain from mic input to line output. When inputs are set to the LINE position,

the input sensitivity is reduced by 40 dB.

Gain (Trim)

Like traditional mixing consoles, the 302’s input sensitivity is set with the Gain (trim)

potentiometer. With the Fader set to unity gain (0 dB or 12 o’clock), make the appropriate

adjustments with the Gain (trim) pot. Make coarse gain adjustments with the Gain (trim) pot during

setup. Once the gain is set to the desired level, recess the Gain (trim) pot to hide it from the 302’s

mixing surface.

Channel Fader

The Channel Fader is the primary level control used during mixing operation. Use the Fader to make

ﬁne level adjustments during operation. The fader can be attenuated from off (full counter-clockwise

position) to +15 dB above the set Gain (Trim) level (full clockwise position).

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Sound-devices 302 User Manual Page 8