Review on 🎛️ BOSS Audio AVA1210 – 7 Band Car Equalizer with Gold-Plated Front Rear and Subwoofer Outputs - Advanced Sound System by Raji Bentz

I had the same problem as a person who had high noise and howling noise even with the engine running. So it's not a problem with bad ground loops or engine noise coming from my wiring. This looks like bad capacitors or is due to feedback from the switching power supply inside the device itself. I have tried this device on 2 different cars that already have a clean silent install so it is not related to bad wiring on my cars. . The device appears to be well put together with buttons having a central notch location and two color options which makes it a shame and I'm very disappointed to have to throw this in the trash.