I recently got a vintage 70's Ampeg V-4B in almost perfect condition, but have yet to get a decent cab for it. I had my first gig with it tonight and had to use a friends newer Ampeg 610 cab. It just sounded so horribly muddy. There was really no low end. Would the fact that the cab is ported have anything to do with this? For some reason I didn't think to check the cabs ohm rating, and ran the v4b in 8ohm mode. I just realized the ampeg 610 was probably a 4 ohm cabinet. Could this have been the problem?