Hi Razer team and community,
I'm experiencing constant audio crackling and volume instability on my BlackShark V2 Pro whenever THX Spatial Audio is enabled in Synapse 4. The moment I disable THX (switch to Stereo), audio returns to perfect quality immediately. This is 100% reproducible every time.
**Setup:**
- Headset: Razer BlackShark V2 Pro
- Software: Razer Synapse 4 (latest version)
- OS: Windows 11 (fully updated)
- Audio format: 16-bit, 48000 Hz (DVD Quality)
- Connection: USB dongle, direct to motherboard (no hub)
**Symptoms:**
- Constant crackling/popping sound when THX Spatial is enabled
- Volume fluctuates up and down unpredictably
- Affects all audio sources (games, browser, music — not app-specific)
- Disabling THX Spatial immediately resolves the issue
- Stereo mode works flawlessly — hardware is not the problem
**What I've already tried (none resolved it):**
1. Disabled exclusive mode on the playback device (Advanced tab → unchecked both boxes)
2. Set Windows Communications tab to "Do nothing"
3. Confirmed no competing spatial audio engines (Windows Sonic, Dolby Atmos, DTS:X all off)
4. Disabled all Synapse enhancements except THX (Bass Boost, Sound Normalization, Voice Clarity all off)
5. Confirmed no Nahimic or third-party audio enhancement software running
6. Verified sample rate is 16-bit 48000 Hz (the only option available)
7. Tried different USB ports (both USB 2.0 and 3.0)
8. Firmware is up to date
9. Clean reinstall of Synapse 4
**Key observation:**
There is no THX Spatial Audio virtual device in Windows Sound settings — only "Razer BlackShark V2 Pro" appears. This means THX processing runs entirely through Synapse 4's driver pipeline. The crackling appears to be caused by Synapse 4's THX implementation conflicting with the Windows audio enhancement layer. Disabling Windows audio enhancements (Settings → Sound → Device Properties → Audio Enhancements → Off) stops the crackling, but it also kills THX entirely — defeating the purpose.
This is a software-level issue, not a hardware or driver issue. Stereo mode proves the hardware chain is clean. Other users with the same headset have reported identical behavior, and some have confirmed that THX works correctly in Synapse 3 but not in Synapse 4.
**Request to Razer engineering:**
Please investigate the THX audio processing pipeline in Synapse 4 for the BlackShark V2 Pro. The enhancement stacking between Synapse 4's THX engine and Windows audio enhancements appears to be the root cause. This needs a software fix — not a workaround that disables the feature we paid for.
Anyone else experiencing this? Would appreciate confirmation so this gets prioritized.
Thanks.