+1
My 2 pennies worth. I have an AN OTO PP (latest model) and with its 12W (IIRC), I have no trouble creating earth shattering bass for my room (and my room is small, less than 10sqm) with little stand mount speakers (Triangle Comet ES).
Of course you need synergy between components but don't forget about the room: the size of the drivers and the amount of free air you will need to push around to create bass. The bigger the room, the bigger the driver, the larger the amount of power needed to move those cones.
So per se, your Tannoys might be under powered as was being said, but only in relation to your listening room.
But on the subject of AN Push Pull design, don't assume they are of a lesser grade than their SE counterparts. All the AN stuff I owned was of the best quality.
Francois, Bergerac, France
Source component/s:
Musical Fidelity M1 Dac, Allo Digi One, Sony SCD-XE800, AVID Ingenium Twin arm, Audio Note Arm One, Groovemaster II 12in, Audio Note IQ3 MM, Denon DL103R MC, Croft Basic 25, TQ Iridium Phonostage, Puresound T10 Stepup Transformer, Zavfino majestic tonearm cable
Amplification:
Audio Note OTO PP, Dussun V6i
Loudspeakers:
Triangle Comete ES, Klispch RP600M
Cables/stands:
Quadraspire, Belden 9497