Almost definitely, you blew one channel. You normally set it to stereo, and lost one side. When you switch to mono, you are hearing half the power, divided into two speakers.

Any fuses you can check?


BIAB 2026 Win Audiophile. Software: Fender Studio One 8, Swam horns, Acoustica-7, Notion 6, Song Master Pro, Win 11 Home. Hardware: Intel i9, 32 Gb; Fender Quantom HD8 & Faderport 8, Royer 121, Adam Sub8 & Neumann 120 monitors.