How do you hook up in-ceiling speakers?

If you have standard ceiling speakers (with no transformer), you hook up the speaker wiring, Black to the left terminal, and Red to the right terminal.

If you have 70V commercial ceiling speakers (with a transformer), you bypass the transformer by either just using the Black and Red wires off of the transformer, or bypass the transformer by hooking the Black wire to the left terminal, and the Red wire to the right terminal.

If you have a 70V commercial speaker system (uses Transformers on speakers and a 70V PA amplifier), strip the ends of the appropriate wires you are going to hook up to your 70V system. Do not strip the ends of the other wires you aren't going to be using.

Hope this helps! Thanks!