@jeneralist I would look at CleanAirKits. Here's a review testing one model and showing how quiet it is: https://housefresh.com/cleanairkits-luggable-xl-review/
And that model is sized to cover 7 people.
Basically all CleanAirKits models are quiet and great though. https://www.cleanairkits.com/
Acoustic instruments aren't that quiet, if I remember correctly.
If I imagine a cello, a violin, a piano, plus maybe a guitar or bouzouki they'd outsound an airfilter easily.
Maybe you can also have one or two windows open for cross airing.
I use a medium sized Trotec airfilter but have max. 3 people plus a small dog in my living room.
Trotec are good, very efficient and not too loud even on full power.
@fae2535
Usually some mix of guitar, mandolin, bass.
And they're quiet compared to their electric counterparts, usually; but you're right, that's not the same as quiet.