Just my thoughts on what I believe is a completely underrated head that I am sad to say is no longer manufactured. Be warned, this is pretty gushing and disgusting. I bought a Peavey Firebass when they first hit the market. I absolutely loved it. The ability to push 700 clean watts (RMS!) into 2 ohms gave me the versatility to push a HUGE selection of cabinets. And at $699 I paid about a dollar per watt-not too shabby. I think the wattage rating is quite conservative because this thing sure seems to have more headroom than that. It's got quite a few features packed into it, too, my favorite being an integrated and front-facing DI which I don't remember being very common at the time. For cabs I opted for two Peavey 210 TXF's, stacked vertically. This gave me the ability to push as much air as a single 410 but made loading in and out MUCH easier. For practice and rehearsal I would usually bring one cab and that was sufficient to be heard over two very loud guitars. It was my main gigging amp until I relocated to another state, changed careers and sold it for some quick cash...what a mistake that was. At least I had the sense to hold onto my cabs. I suppose it helped that they were in storage on the other side of the country. Fast forward to today and I've been out of live performance for quite a few years but I've continued playing with, er, by myself privately. I picked up a GK Backline 600 to run one of my cabinets as a practice amp a couple years ago and tonally it sounds great, but compared to the Firebass it just sounds anemic and like most heads will only handle a 4 ohm load, so I can't run both of my 210's. I've recently decided I want to start gigging again. But my favorite head has been out of production for quite some time. Why do companies always stop making my favorite stuff? Really. I've learned that if I really like something it's usually best to buy two, because it will inevitably get discontinued. So after poking around a bit I just bought a used Firebass from a Guitar Center that is currently en route to my house via UPS. I've replaced a blown speaker in one of my cabs and when the head gets here I'll be back in business with my old stage rig. I called the GC and spoke to a sales guy who was very helpful. I asked him to please make sure that the head was still able to push 2 ohms and remain stable and he said "Sure, I'll call you right back." He calls me back a few minutes later and says "Well, we hooked it up to an Acoustic 810 and a Carvin 115 to get that 2 ohm load. We found out that everyone on staff has dandruff. Want to know why we know that?" I responded laughing "No, I already know, I used to have that very same head and I think I know what just happened." He said it was so loud that pieces of the ceiling came loose and the whole staff had to come see what the hell was going on. This is a seriously powerful amp. In another store I once hooked a Firebass up to two Peavey 412 cabs (again, no longer made) and plucked an open E just to see what it would do. The resulting air movement reminded me of one of those outdoor giant high speed fans, with my clothes sticking right to me. I played for about ten seconds at this volume to satisfy my need for a Nigel Tufnel fix and then promptly turned it down for the sake of the store personnel and other customers, but my curiosity was satisfied; I knew that thing would provide all the power I would ever need and more. Tone snobs will undoubtedly deride the fact that it is solid state and a little transparent sounding. I understand that. And they are heavy at around 50 lbs. There is nothing boutiquey about these amps, they are workhorses. But they seem almost impossible to break, supply a ton of clean power, lots of useful features, and can be had in the $200-$350 range in the used market. By far, the ability to push 700 watts at 2 ohms is the biggest selling point for me, as it means I can assemble any configuration of cabinets I want. Anyway, I'm done gushing and slobbering. Just felt the need to share my experience with an amp that I don't think ever really got a fair shake among bassists. I've seen very, very little negative feedback from guys who actually owned and gigged with them. If you get the chance to play one, do it. You may be surprised. I am left wondering why more companies don't make heads that are stable at 2 ohms. It would seem that this would only make them more versatile. I think there was a thread here to this end earlier.