The Fastest most musical amp

I auditioned a pair of Watt/Puppy 7's. The dealer had Spectral 360 Monos with the Spectral Pre and MIT cables.
I believe he had a Wadia 861 on the front end.

It was clear as a bell, extremely fast, but completely
lacking bass.

I don't know if it was the Amps, the speakers, or what.

I own a pair of Krell FPB 350 MCX's. These things
are extremely fast and took the bass response in my
speakers so low I turned my sub-woof completely off
during 2 channel music listening.

If you are into solid state, fast and sensitive amps,
want full bass response -- put Krell Mono's on your
list.

I would love to hear the Watt/Puppies with my Krells.

Just to clear up some misinformation above...
1. Spectral equipment is super wideband & can go into self-destructive parasitic inaudible ultrasonic oscillation modes without networked cables, which present a more stable load than any reactive speaker possibly can.
2. MIT cables do not slow anything down. They are not filters; the networks are in fact paralleled. The networks behave similar to Zoebel terminations across a driver's terminals, helping to absorb the reflected counter emf from the linear motor's winding. A super wideband amp seeing these reflactions coming back into it at full amplitude can go wild & destroy itself without any audible indications of problems until the output devices fail.

With what speakers? The amp and speaker combination affects the overall "speed" of the music. Try using the Tenor amp with an inefficient low impedence speaker and find out for yourself (Or a slow SET with a Lowther).

Nomenclature in the audio world can be a little strange at times. "Fast" what is fast in an amplifier. All electons travel at the same speed. While I make some fun of the term, and can not explain fully what "fast" is--I immediately knew what character was being referred to. The amp that immediately came to mind was the Bel Canto Evo 200.2 (I believe that was the model). I was really impressed with this amp, it seemed to effortlessly be there with all the reserves for the music. What was more impressive is that it is a digital amp and did not lose it's musicality--something I did not expect. I've only auditioned it once, and thus do not have enough experience with it to point out where it might fall short. But I can say on my short audition--it is definitely "fast".

Dis:

Not a clue as to where you are coming from, based on your posts/answers (which seem to be all over the map), and also considering that you do not have a listed system.

As far as an informed opinions go I will suggest that you list the rest of the intended setup, then go from there.