My QSC monitors do have RCA inputs but I don’t use them. They were designed to connect something like a cassette deck to play music during g a break between sets. Take a 1/4” to 1/4” instrument cable between the Focusrite left channel line out and the QSC channel one combo jack in. Set the QSC switch for channel one to Line, not Mic.

If I remember correctly, those lower-cost Focusrites (which still sound fine) have no separate Control Software where you would set gain and routing. So, go into your computer’s Windows Sound Mixer (click on the little speaker icon in the lower right of the Taskbar). Make sure the Focusrite is checked as the Default output device. Make sure the volume slider for that playback device is at least 90%.

If none of our suggestions solve it, please take some pictures and give us detailed notes of your connections and all the settings related to audio you can find. We’ll get it.

BIAB 2025 Win Audiophile. Software: Studio One 7 Pro, Swam horns, Acoustica-7, Notion 6, Song Master Pro, Win 11 Home. Hardware: Intel i9, 32 Gb; Roland Integra-7, Presonus 192 & Faderport 8, Royer 121, Adam Sub8 & Neumann 120 monitors.