For those with tecamp pumas, can you tells us more on how the SL900 compare?
I have the Puma500, which is a touch fatter and warmer than the Puma1000. Since the Puma1000 can't be bridged into 4ohms, hard to do a real volume comparison with the SL900.
The SL900 is, obviously, a bit louder than the Puma500. Again, it is hard for most of the smaller cabs that I use (4 ohm 410's and 212's) to really use much more power than 500 or 600 watts, so I can't really do a very good 'maximum volume test'. I assume with two large 8ohm cabs, the SL900 would pull ahead.
Tonally, when you run the SL900 clean, they are in a similar tone universe. The Puma extends much lower in the bass, and much higher into the upper treble than the SL900 (and most other amps as well), but again, that isn't necessarily a good thing. That super deep bass uses up headroom and really can stress the drivers, and that beautiful upper treble pingy sizzle can get a bit lost in the cymbals in a mix.
That being said, they are more similar than different... bit, fat, warm low end (with the SL900's hi pass filtering making that low end more controllable... but still massivly bigger than the Shuttle 9), very low distortion, smooth midrange (at least when the SL900 is run clean), and plenty of sparkle up top (although the nature of the treble response is different, with the Puma being almost the definition of hi fi up there, as we use that term on TB, and the SL900 being much 'sweeter and tubey/organic' up top).
The Puma has the edge in 'quality feel', but at $1,400 new in the US, it should.
If you have a large 8ohm cab, the current Puma1000 is pretty darn impressive, since you get all that wattage wumping into 8ohms when bridged. However, for most of us who use two smaller 8ohm cabs or one larger 4ohm, and given the price, the SL900 is a pretty easy decision!
Of course, the SL900 can grind and snarl a bit too, which would be an added bonus for some. However, run clean, it is definitely in that 'Glock Heartrock, Puma' tone universe of very big down low (with some tubey warmth) and very pure in the mids and crisp up top.
Very impressive amp, and powerful enough to run virtually any 4ohm cab to, for all practical purposes, full volume.