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Use the Proximity Chat guide; Patch 1.4 targeted that issue.
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Community Feedback #3 tracks muffled or echoey gunfire and explosions as a separate post-Patch 1.3 audio issue, especially on PC. It is not the robotic Proximity Chat problem that Patch 1.4 targeted. Some players report that forcing stereo helps; treat that as a reversible test, not a complete official fix.
QUICK ANSWER
Community Feedback #3 says the team is investigating wider game audio reports since Patch 1.3, including gunfire and explosions sounding muffled or echoey. Developers have reproduced the problem internally. The briefing notes reports that forcing the game into stereo has resolved some player issues and asks those players to say whether that change helped.
SOURCE POSITION
Community Feedback #3 says the team is investigating wider game audio reports since Patch 1.3, including gunfire and explosions sounding muffled or echoey. Developers have reproduced the problem internally. The briefing notes reports that forcing the game into stereo has resolved some player issues and asks those players to say whether that change helped.
MATCH THE SYMPTOM

CHOOSE YOUR CURRENT STATE
World audio after Patch 1.3 and Proximity Chat distortion are different official investigations.
Use the Proximity Chat guide; Patch 1.4 targeted that issue.
Community Feedback #3 tracks this as a post-1.3 world-audio report, especially on PC.
The briefing records player reports that forcing stereo helped some people; revert it if it does not.
REVERSIBLE CHECKS FIRST
Confirm the current installed patch and whether the muffled sound began after Patch 1.3 rather than at launch.
Separate this from Proximity Chat: if voices are robotic, use the dedicated VOIP guide; this page is for gunfire, explosions and other world audio.
On PC, check the current Windows output device, sample rate and whether the device is set to surround, spatial or stereo.
If the device is currently using a surround or spatial format, test one reversible change to stereo and listen to the same weapon in the same location.
Restore the previous audio format if stereo does not help, then capture platform, audio device, configuration and whether stereo changed the result.
Report the dated observation through official support; do not keep stacking audio-driver reinstalls on top of an acknowledged investigation.
IMPORTANT LIMITS
QUICK ANSWERS
Community Feedback #3 tracks muffled or echoey gunfire and explosions as a separate post-Patch 1.3 audio issue, especially on PC. The team has reproduced it internally and is investigating. It is not the robotic Proximity Chat problem that Patch 1.4 targeted.
The official briefing records player reports that forcing the game into stereo has resolved some issues and asks those players to say whether it helped. Treat stereo as one reversible test. Restore the previous format if it does not help.
No. Patch 1.4 targeted the main prolonged distorted or robotic Proximity Chat issue. Muffled gunfire is a different world-audio investigation.