Why this answer matters
Comparing independent connection modes is a strong isolation test: audio that works over 3.5 mm but not LIGHTSPEED points toward routing/receiver/software rather than the acoustic driver.
2 requirements3 verification steps1 primary source
Requirements
What has to be true
- Use the matching receiver for LIGHTSPEED.
- Use a compatible source for Bluetooth or 3.5 mm testing.
Verify it yourself
Use this test sequence
Change one variable at a time so you know which requirement made the difference.
- 1
Run left/right headphone reference.
- 2
Compare LIGHTSPEED with 3.5 mm or Bluetooth.
- 3
If only one path fails, troubleshoot that transport/routing path first.
Limits
What this answer does not prove
- Microphone behavior can differ by connection mode and host.
Relevant DeviceOK checks