Well I can understand using separates for your main system.
May-be I'm crazy, some have a different opinion on my state of health. But everything I use, is a mono-bloc system, Except for the theatre system which uses a five channel amp.. At one time i used to have / own or beg, borrow of steal different speakers, which required solid amplification Equinox being one brand with models going down to a 2 ohm load. Unfortunately Equinox are no longer in production.
I'm not into all these fancy sound systems with a speaker collection hanging of the ceiling. Personnel I think there a complete waste of time, and small amount of money people spend. Filling up all the connections on there AVR, and convincing themselves it''s all Utopia , and the best ever. With Helicopters flapping over the back of the lounge chair
Frankly a good brand of speakers, Magico etc, together with a good amplification leaves, your so-called theatre system for dead. And people react in horror when they learn I don't own a sub wooofer. Which in most cases are a marketing ploy, to flog stuff the gullible are buying something they don't need., but must have because everyone else has one.
My wife would sing karaoke in our bedroom
With due respect, I've never confronted that problem, Are you sure your not ready for the retirement home, where you can sit on the verandah, and dream of past glories ,
More tea Vicar.
But a small personal question, do you conduct while she's singing.