I stumbled upon an Ampeg Isovent cabinet on ebay today and I could not find much information about it on the internet. I was wondering if anybody has had any experience with these and could tell me about it. It has 2 15's, but arranged strangely and 2 10's angled up. It seems like a good idea for me because I like the boom of a 15 with the clarity and attack of 10's. Just wondering if anybody has tried one of these.