Hello avanti1960,
I agree with you in general that most good quality speakers will benefit by being fed more power from a quality amp.
However, there's an inherent problem with attaining high quality bass response performance from a pair of tower speakers; namely that the bass, midrange and treble transducers are all fixed in position, typically in a vertical alignment.
Most owners will position their towers in relation to their listening seat in a triangular configuration, with the speakers 6-8' apart and the listening seat placed carefully at the midpoint between the speakers with the seat positioned at varying distances away from this midpoint depending on owner preference. The idea being this will provide optimum stereo imaging at the listening seat with the assistance of precise speaker toe-in adjustments.
This is a fairly effective method for attaining good midrange and treble response and a good stereo sound stage image at the listening seat. The problem is that the bass drivers cannot be independently positioned for optimum bass response at the listening seat. This results in your statement, of "Absolutely no need for subwoofers which is the preferred solution IMHO," being an opinion that is not supported by the facts.
The truth is the bass response performance a tower speaker user attains at his listening seat is dependent on luck. The odds that two tower subs positioned for optimum midrange, treble and stereo imaging at the listening seat will also provide optimum bass response performance positioned in the exact same position are extremely low.
You should consider yourself lottery winner lucky for apparently attaining both with your tower speakers. The moral of your experience is that you got extremely lucky. I'd suggest refraining from formulating or extrapolating any opinions beyond this fact since they will lack any value.
Tim
