I'm trying to learn about amps (head/cab vs. pre/power/cab vs. combo). I've decided to take the plunge and go with a pre/power/cab setup. I was looking at my Ampeg B-100R today and noticed that the controls and inputs are actually mounted in a serperate "box" which is mounted to the back of the cabinent. To my untrained eye it kinda looked like it may be a 19" rack-mountable module. I unscrewed the back cover and then removed the "box" from the cabinet. It's actually 17.5" wide but it does indeed look like it could be used in a rack. Couple questions: 1. Seeing as the B-100R is only a 100w amp is it even worth using as a temporary driver for a 410 cabinet? (I'm eyeballing the Avatar 410) Will it have enough juice for a practice setup? 2. If I buy a poweramp can I use the lineout on the B-100 as a temporary preamp? (As you may have guessed I will be adding things in stages.) 3. There are 2 dinky looking wires going from the "box" to the cabinet. Surely these are not carrying the amplified signal to the 15" speaker?!?! They are VERY thin, but there are no other wires going into the cabinet to indicate a seperate amplifier. I wouldn't know what to look for on the circuit board as far as ID'ing the amp circuitry.