how's it going UG. i need some answers regarding speakers.

1. Why don't (guitar amp)cabinets need their own power supply? How about others?
2. Would it be okay to play an ipod or other music source through one of these cabinets? Would I use the head's input or could I just plug the ipod into the cab with a headphone jack to 1/4inch cable?
3. Do you always need a preamp when using speakers?

Although it sounds like I'm retarded, I'd like to think I'm not. Thanks in advance.
VAN HALEN - March 13 at the Izod

Quote by xchiefx
What kind of idiot mows the street
Cabs are powered by amps. Thats what an amp does.

The amp in an ipod is meant for driving headphones, it wouldn't be strong enough to drive a cab at volume without an additional amp.