What is the best amplifier for Tannoy Kensington ?

Ignore the last comment, Tannoys are time aligned thorugh the crossover point, this is why they are so coherent. To biamp with different amplifiers with different transfer functions will destroy what these speakers are about.
I own several pars of Tannoys - your Pass Labs will have enough power.

Yes, Tannoys are easy to drive, and don't benefit from being bi-amplified. You are best off just giving it your best shot with the amp.

Agree,
There`s no logical reason/benefit to biamp the Tannoy speaker.
Regards,

I don't have a Tannoy dealer anywhere nearby....I'm just going off of hearing them at Newport Beach....loved it.

Well, the speakers are set up for bi wiring/bi amping, are they not? What does it hurt to try?