Radial JS2: split a microphone for room and recording

One source, multiple destinations

JS2 is a passive mic-level splitter with one transformer-isolated and two direct outputs, not three isolated outputs. JS3 is a different model. Each destination preamp receives the same source for its own mix; the splitter is not a stereo mixer, recorder or backup microphone.

Proposed example: microphone to INPUT, DIRECT-1 to room preamp, ISOLATED to recording/broadcast preamp. Identify the second direct output if used; it does not gain JS3 isolation. A finished program may only need a mixer feed; remixing voices calls for per-source splits and enough recording inputs.

Phantom and split preparation

1. Label source, output and mixer at each end. Radial identifies DIRECT-1 as the phantom return path to the mic. Assign one preamp to supply phantom power and agree on the settings at the other destinations before connecting. Do not expect the isolated output to power the mic.
2. Protect outputs and lower levels. Confirm microphone type/power; JS2 needs no supply. Check speech at each preamp and set gains separately. A mic feed needs a suitable preamp, not a line input selected by connector shape.
3. If removing the room mixer silences a condenser, check whether DIRECT-1 lost its responsible power source. Plan handover off-program; do not toggle phantom as a live test. For hum inspect paths and documented audio ground lift while retaining protective earth.

Discuss distribution and operation

Compare an analog split with clearly identified isolated outputs, compatible digital sharing with shared preamp control, or a finished mix feed. Rehearse all destinations and the procedure for removing a mixer before the event.

More setup questions

Documentation and preparation

• Radial JS2 — microphone splitter
• Radial JS2 — direct/isolated outputs and phantom path
• Radial JS2 FAQ