Why every combination works
| Case | Input from BT Module | Tone Control Used | Output to Speakers | What Happens | Sound Result |
|---|---|---|---|---|---|
| 1 | 1 input (L or R) only | Single pot (bass/treble/volume) | Split into 2 speakers | Same signal copied to both | Mono sound on both |
| 2 | 1 input (L or R) only | Dual pot (bass/treble/volume) | To 2 speakers (L+R used same input) | Both channels get same input but separate control paths | Mono in stereo path |
| 3 | 2 inputs (L+R combined into 1) | Single pot | Split into 2 speakers | Mixed mono sent equally | Mono (mixed L+R) |
| 4 | 2 inputs (L+R separately) | Dual pot | To 2 speakers (L → Left, R → Right) | True stereo control | Stereo sound |
| 5 | 1 input used → single pot circuit duplicated twice | 2 separate single pots (one per speaker) | Each speaker gets processed signal | Both sides controlled separately but same source | Dual mono |
| 6 | 2 inputs → dual pot circuit duplicated twice | 2 stereo tone control sections | Each channel processed individually | Full stereo control twice | Stereo (redundant, but works) |
| 7 | 2 inputs (L+R) → 6-pin pot (dual gang) | Single shaft dual pot (stereo) | To 2 speakers | Left and Right controlled together | Stereo (best way) |