I asked CoPilot AI and this was the reply (I can't guarantee the accuracy):

Best ways to capture an entire orchestra while streaming from a Quest 3

1. Use a USB‑C stereo microphone (the simplest, most reliable fix)

The Quest 3 accepts USB‑C audio input, and when you plug in an external mic, it dramatically reduces or bypasses the internal noise suppression.

A stereo field mic will pick up the whole ensemble beautifully.

Good examples (no need to buy expensive gear):

• Sennheiser MKE 200 Mobile Kit (with USB‑C adapter)
• Rode VideoMic GO II (USB‑C native)
• Shure MV88+ (USB‑C with included cables)

These are small, portable, and designed for capturing rooms, not just voices.

Why this works: The Quest treats the external mic as a raw audio source and applies far less suppression, so the orchestra won’t vanish.

2. Use a tiny USB‑C audio interface + any stereo mic

If you already have a mic (or want more flexibility), a pocket‑sized interface like:

• Saramonic LavMicro U3C
• U‑Green USB‑C audio adapter
• Rode AI‑Micro

lets you plug in:

• a stereo lav
• a small condenser
• a boundary mic (great for rehearsal rooms)

This setup captures the entire room naturally.

3. Use a boundary microphone

Boundary mics (like the Audio‑Technica PRO 44) are designed for:

• conference rooms
• rehearsal halls
• capturing ensembles

They sit on a table or music stand and pick up the whole space evenly.

Paired with a USB‑C interface, this is one of the best “whole orchestra” solutions.

4. Wireless mic systems (only if you want mobility)

If you need to move around, a wireless system like:

• Rode Wireless GO II
• DJI Mic

can work — but instead of clipping the mic to yourself, you clip it somewhere central in the room.

This gives you:

• freedom to move
• a consistent room sound
• no cable to the headset

Just note: wireless systems are usually mono, not stereo.

🎧 What won’t work

These are the things that seem like they should work but don’t:

❌ Relying on the Quest’s built‑in mic

It will always suppress non‑speech audio, especially sustained tones and ensemble sound.

❌ Bluetooth microphones (most of them)

The Quest drops audio quality drastically when using Bluetooth mics.

❌ OBS monitoring from a PC

You already explained why this isn’t viable for rehearsals — and you’re right.

⭐ The best setup for your use case

Since you want:

• the whole orchestra
• mobility
• simplicity
• no PC
• live streaming from the Quest

Your best option is:

→ A USB‑C stereo microphone plugged directly into the Quest 3

or

→ A tiny USB‑C interface + a boundary mic

Both give you natural, full‑room sound with minimal fuss.