Well, I finally finished my 15/6 build, and it sounds awesome. Problem is, it exposes the weaknesses in my amplifiers/basses. I have a great bass to work with for the time being - an EBMM Stingray. It appears to be in solid shape with very little noise. I have a Hartke 3500 that's beat up like crazy. It is producing a fuzzy sound through the mid driver on the 15/6. I love the overall tone, but can't have that type of fuzz happening for shows. I also have an Acoustic B600H that does NOT have the fuzzy/hiss sound in the mid driver, but I've never really liked the tone of that amp. Ideally, I'd like to get a replacement that has a lot more power but a similar sound to the Hartke. So far, my options have come down to a Carvin B2000 or maybe a Hartke 5500, LH1000, or KILO. I'd prefer something under $1k and not super heavy. I'd also like it to have decent power and a tube preamp. Any other suggestions?