To Daisy Chain or Not To Daisy Chain

Howdy Cork and Welcome to the Chordie Forums!

I'm assuming that you are looking to "spread the sound" a bit by hooking up the Peavy as another speaker to augment the one in your combo amp.  Your regent has an aux speaker out, and likely it will be an amplified output looking for a passive speaker.... your speaker has an internal amp as well but the two should be able to get along as long as you keep the amp in the peavy turned down so that it passes most of the input straight through without bumping it too hard, ie: hard enough to let the smoke out of itself.  Usually you would use a powered speaker for outputs that are coming out at line level tapped before the main amp... still 8 ohm but a really low voltage.  I'd try hooking them up and with the speaker turned down, sneak up on the speaker volume knob just until the two are balanced and see what happens.  By my thinking it should be fine, but there are more heads around here who I'm sure will chime in shortly.

Once again Welcome to Chordie!
Take Care;
Doug