Hi Dave, I think that the Inpol may be closer in sound to the Twin Towers than to either the Classics or the Logos. If you have heard the Classics, then the Logos may be your ticket because of the increased power and bass control at higher listening levels. The Inpol appears to be a much refined Twin Towers with a little more power, to oversimplify.
I have owned the Twin Towers and the Logos and there is really no comparison except for a slight sonic trait. The TT wins hands down but at about 35WPC, it has limitations and requires reasonably sensitive speakers. Forget anything 4ohms with an unstable response curve?
I have paired the Logos / TT with Hales T-5's, Sonos Faber Grand Piano Home/ Piega P2 Ltd's.
The best matches were the Logos/ Hales and TT/Sonus.
If I had a chance to do it over again, I would keep the TT/Sonos combo. Alas, I no longer have any of the above except for the Piega's.
** I primarily listen at fairly low/almost background levels.** However, on rare occasions I turn the volume up a bit.
I hope this rambling helps a bit. Thanks, BJ.