Review on BOSS Audio MC900B Weatherproof Amplifier - 4-Channel, Bluetooth, 500W, Bluetooth Remote, Full Range, Class A/B, 4-8 Ohm Stable, Aux-in, RCA Outputs, USB Charging by Bradley Wacks

So far this system works well and sounds pretty good for the price. Use it to power 4 boat speakers and 2 separate amplifiers for subwoofers and wake bar speakers. Sound is impressive enough with just four main speakers (better than the Clarion m303 it replaced). I had an issue with no sound over bluetooth despite showing playback and connecting with controls still working. I then found that the controller was red instead of blue and remembered having pressed the power button on a previous use. I assume it was muted. I pressed the power button for a click and it turned blue and there was sound. I suspect some of the users who mentioned this issue didn't understand the issue and assumed it was dead. I will update if I decide to downvote this positive review.