I own a Crate V-33 and I had three questions.

1. If I want to hook up a 4x12 to it do i use the extention speaker out or the normal one, and do I have to unplug the other speaker when I do?

2. Can I crank it all the way with out it blowing up?

3. Will Overdrive pedals sound better in the effects loop?

1. use the extension speaker out, and no you don't have to unplug the combo speakers. Oh yeah, and you don't need 4x12, 2x12 will do

2. Yes

3. Nope