In addition to the above, did you check Windows balance settings? (Apologies if this has already been mentioned, I only glanced through the above posts and did not read them thoroughly.)

1. Right click on the speaker icon (#1 on image below).

2. Select "Playback devices" (#2).

3. Double-click on "Speakers" (#3).

4. Select "Balance" and check that the left and right settings are equally balanced (#4).

Regards,
Noel

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Audiophile BIAB 2024