I just landed my hands on a 1820 Cabinet that is in pretty good shape minus a few things. I'm looking for suggestions on speakers i should use to replace the 2 - 10 in. Scorpions currently in it. They aren't sounding too awesome due to the fact of the second problem. The built in crossover is having major problems. When i run my head through the full range, the cabinet sounds like crap with hardly any sound when the gain on my amp is half way up. When i use the high side of the bi-amp it sounds decent but not like it should...When i try to use the low side of the bi-amp nothing works.. I cleaned all the inputs using a very hi grit sandpaper to remove all the junk and then added dielectric grease to keep from rusting. Any ideas on how to go about fixing the crossovers? Also any suggestions on heads i could use or combine to make the best of this cabinet. I am currently using a peavey series 400 head but i kinda want to add some of todays technology.