What information do you need to not work blindly?Dauntless wrote: ↑Jan 17, 2018 4:51 pmYou asked a question that is sophisticated, requiring a sophisticated answer.
But there might be a simpler thing for you to look for. Only part of your picture loads for me, I'm still working blindly. Get a second identical 25w speaker to hook to the other side, do not use the 12w at all. What MIGHT have been happening is you were lowering your impedance below where it wanted to work, OR you might have overloaded the one side by having no speaker at all and that is what shut it down. You need a match to both sides. A pair of 25w 4 ohm speakers might work just fine on this, whatever it is. But I'm still not sure what it is.