When I see all the pics for these in a install where the speaker wire connection is on these amps I see like a connector usually heat shrink is there a connector? you attract to wire and tighten? I thought you just stick wire in an tighten

 

For the SD amps, I just use wire. Some other amps I’ve used in car audio had much bigger terminals and they were spaced further apart and I had adaptors that took gigantic power wire and had a solid metal output that went into the power/ground terminals.

 

Look up wire ferrules

Juice