So now I still have 2 audio channels available, I think it could use a little extra bass. I have an old Sub, and a low-pass filter. I was thinking about attaching 2 6.5 Inch speakers and the sub on the same two channels, but I’m not sure how that will work yet, I am not sure how this amp will handle being pseudo bridged, I am good with simple electronics but audio stuff sometimes baffles me.

So my thinking is, I will connect the second left and right channels to the two 61/2 inch speakers, and the low-pass filter then to the sub, making a weird 3-way(or 2-way) mono speaker from a stereo connection. I guess i will just have to try it and home it does not blow up.

Kinda like this:

This is an old Subwoofer from a 2.1 computer speaker system, the main board eventually fried, so I yanked it out, and wired straight to the speaker, and taped over the holes for input/speakers/stuff.

These are two speakers my dad made when he was a teenager, they still work even though they have been in his garage for a few decades, and still sound ok. I think he had the polarity backwards on one, and I am not sure if the holes he drilled into the top are acoustically correct, but whatever.