@mesch yes the Fritz don't require the power the LRS do...not anywhere close.
Fortunately my Van Alstine amp plays very nicely with both sets of speakers.
But ...the treat is, surprisingly I can also use my 3.5 watt 2a3 SET amp with the Fritz with great results.
I've been running these Fritz speakers without subs for a few weeks. Honestly I don't miss the subs. I have just enough room gain that everything is nice and full and balanced. Am considering a digital crossover as some point to relieve the Fritz's (and amp) of a little low end duty and pass that on to stereo subs...but haven't embarked on that adventure yet. But...there are plenty of happy listeners with Fritz speakers going without subs.