First of all, since my days with the Rogers LS3 5A I love little loudspeakers. If well designed they do 75% of the spectrum better than most larger system under one condition. You hand that bottom 25% to a subwoofer and use a two way crossover preferably digital. You will need two subs and you will have to cross somewhere between 90 and 120 Hz. Look at the phase and impedance curves. They go wonky under 100 Hz. The little woofers are really midrange drivers and trying to make bass requires large excursions which Doppler distort everything else the woofer is doing like Ella's voice. This is less noticeable at low levels. Subwoofers however turn David into Goliath just in case you want to turn it up on occasion.
The Fritz is a great speaker. I would compare them the Harbeth P3s and the Falcon Acoustics speakers. I know the Harbeths really well as I set up my son in law up with a system around them. They are every bit as good if not better than the old Rogers and a great value. Their tweeter is ferrofluid cooled. With subs they go louder than anyone can tolerate and they image beautifully. I have not heard the Falcons but they get universally good reviews.
The perfect amp for any of these speakers is the Atma-Sphere MA1. Even listening at low levels peaks can run surprisingly high and you have to be able to cover them or the speaker will sound constrained dynamically. The first watt is important but so is every other. If you have a wildly efficient loudspeaker smaller amps are fine. None of these speakers fit that description.
Put two Kef KF92 subs under any of these speakers and you will be stylin.