I just recently got my hands on an Ampeg V4 head and matching 412 cab. The amp is 100% beautiful tube tone and I am really happy with it. The only problem is the speakers in the cab. They appear to be the originals and while I think that's neat and all, they just don't handle hardly any volume. I know that this was manufactured as a guitar amp not bass but I have heard a lot of great things about it for bass. My question is, what speakers would go best in this thing and still have a very similar tone? Money is an object here so try to be reasonable 
