The chart below describes the inputs and output panels of the Sound Devices 302 Compact Field Mixer, including functionality and pin configurations.

The 302 Input Panel

302 Input Callouts
# I/O Connector Type Pin Configuration Notes
1 Inputs 1-3 Transformer Balanced XLR-Female pin-1 = ground pin-2 = hot pin 3 = cold For unbalanced inputs, ground pin-3 to pin-1 of the XLR-Male connector. Inputs can be selected to either mic or line-level using the switch above the respective input's XLR connector. Stereo linking between channels 1 and 2 can be set in the 302 Setup Menu. When using MS Stereo techniques use channel 1 for the "Mid" input and channel 2 for the "Side" input.
2 Headphone Output 3.5 mm TRS Stereo Female tip = left ring = right sleeve = ground Drive headphones from 8 to 2000 ohms to required monitoring levels.

The 302 Output Panel

302 Output Panel
# I/O Connector Type Pin Configuration Notes
1 Left Channel Master Output Active Balanced XLR-Male pin-1 = ground pin-2 = hot pin 3 = cold If connecting to an unbalanced input, unbalance the output by using pin-2 for signal and pin-1 for ground. The output level can be attenuated in the 302 Setup Menu from line-level to mic-level. Attenuation is set from 0 to -16 dB in 2 dB increments, and -40 to -56 dB in 2 dB increments. Output level attenuation is applied jointly at both left and right master outputs.
2 Right Channel Master Output Active Balanced XLR-Male pin-1 = ground pin-2 = hot pin 3 = cold If connecting to an unbalanced input, unbalance the output by using pin-2 for signal and pin-1 for ground. The output level can be attenuated in the 302 Setup Menu from line-level to mic-level. Attenuation is set from 0 to -16 dB in 2 dB increments, and -40 to -56 dB in 2 dB increments. Output level attenuation is applied jointly at both left and right master outputs.
3 Return (Channel 4 and 5) Input Unbalanced Stereo 3.5-mm Female tip = left ring = right sleeve = ground This connection can be used for monitoring returns or as inputs 4 & 5 when selected in Setup Menu. See The "Five Channel" 302 for more details.
4 Mix In Unbalanced Stereo TA3 Male Input pin-1 = ground pin-2 = left pin 3 = right An input to the master bus designed exclusively to link the Tape Out/ Mix Out of a 302, 442, MixPre, or MP-2 (discontinued) to the 302 for additional inputs. Shell of TA3 connector must be grounded to pin-1 to open connection.
5 Tape Out/Mix Out Unbalanced Stereo TA3 Male Output pin-1 = ground pin-2 = left pin 3 = right Same program as master output. Also used to link to the Mix In of a 442 or 302.
6 DC Input Hirose 4-Pin Female pin-1 = (-)negative pin 4 = (+)positive Accepts DC voltages from 5–18 VDC for mixer powering. External DC is completely isolated (floating) from the rest of the circuitry. Commonly used with Sound Devices XL-WPH2 power supply.

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