Ok, I currently have a 400+. The tone I get is good, really good, but its not exactly what I'm looking for. I want something more hi-fi, more articulate. So I've narrowed it down to these 2 amps. I have an SWR Goliath III, which i'm gonna hang on to. When I get a new amp, i'm also gonna get a new bass, either a sterling or a stingray, probably a sterling. For my own music, I play hard rock stuff. Stuff like STP, Soundgarden, and Tool. I know Rob DeLeo plays a signature schecter into a sansamp, Ben Shepard plays a p-bass into something mesa, Paul D'Amour played a rik and eventually a stingray into an ashdown, and Justin Chancellor played a stingray and went to a wal, into a demeter preamp. Could either/both of these amps get me in the ballpark with these tones, with a musicman bass? I've searched on the forums, but I couldn't find any direct comparison with these amps. Ok, second question. I run a basement recording studio. I record local bands. I record all sorts of bands, from death metal to punk. The bass players we record always use my gear, which is what I want, because I have experience with it, so I know how to dial it in, and how to record it. But my 400+ isn't very diverse at all. Again, would either/both of these amps be better able to cover a large array of genres of music? I've played through an ABM500 before, and I loved it, the EQ was great, so I'm thinking it's very capable of being used for all different types of music. I've never played the M-Pulse 600, but it seems comparable to the ABM500. I'm definitely leaning towards the Ashdown, because I like the sound a lot, and the price is great. Let me know what you think. Thanks.