Can you use headphones? Also -just curious if listening sans subs puts any significant strain on the rest of your speakers, though I suspect not.
I actually used a recording of Beethoven op 59/1 and 59/3, the first and third Razumovsky Quartets, to audition a sub, many years ago. The salesman was aghast and kept trying to play some rap to show the boom factor. My reasoning was that the Beethoven with its extended cello parts would reflect the kind of bass that I was more likely to reproduce. I had also remembered reading that a musical sub should make even a solo flute sound better by enhancing the room ambience. I would use other music now-Shostakovich Fifteenth Symphony comes to mind-to test a sub, but the Beethoven Quartets would still be useful.
Regarding the Op. 18 works, I prefer: 1) ensembles who play them big and bold, and not like embryonic Mozart; and 2) Vibrato, please. I really dislike Quartets that eschew all vibrato (and coincidentally play at crazy speeds) and completely blow the expressive effects of the music.
My longstanding favorites are the Hungarian Quartet (stereo version)) and the Cleveland Quartet. Most of the more modern recordings I’ve heard are HIPP and therefore excluded by at least one of my criteria