I currently have a GK 400RB-III combo (15") that I acquired from a friend through a trade about a week ago because I needed an amp for a gig, quick. I am currently in a band that is looking to go on tour very soon, and I need a touring rig... Today, completely out of the blue, I remembered that my brother had left some sort of speaker cabinet here at my house, not knowing what it was... I took a look, and lo-and-behold, it was a Kustom cab... 12" w. tweeters!! Here's my problem/question: If I can hook up this cab w. my GK combo, I know I will have a workable touring rig... I just have no knowledge of impedance and the like... Here's the info I have: The amp head runs at 240W: 150W @ 8 Ohms, 240W @ 4 Ohms... that's what the owners manual says. The extension cab says this on the side: 8 Ohms 100 Watts RPM 200 Watts Peak 3KHz As I didn't study at MIT, I have no idea what this all means... For gits and shiggles, I hooked them up w. an instrument cable, and it worked at a low volume just fine... My Question: IF I GO BUY A SPEAKER CABLE TOMORROW, WILL THIS COMBINATION WORK TOGETHER!? Thanks so much!! I've never had to deal w. this kind of thing before. If you need more information, I'd be happy to give it, assuming I can figure it out... Thanks!