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
| # | 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
| # | 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. |