I'm more into rock than jazz or classical. The only orchestral pieces that I've played anytime in the recent past were these Chopin Blu-rays -
https://www.amazon.com/gp/product/B004DIPLQS?psc=1
https://www.amazon.com/gp/product/B005FAH17A?psc=1
I'd have to A/B test to know for sure, but my impression is that my subs are overkill for music like this. I credit my acoustic panels and Trinnov Altitude audio processor for improving the sense of being in whatever space the recording took place. I've configured my Altitude to upmix stereo and 5.1 content to utilize my overhead speakers (6.2.6 config). For stereo music I like the Auromatic upmixer. For 5.1 material I use the Dolby Surround Upmixer (DSU). Upmixing really does expand the spaciousness of music. I was never a big fan of Pink Floyd, but listening to the
Dark Side of the Moon SACD (5.1) upmixed with DSU is a
very impressive listening experience, especially with the Funk subs.
Although one of my subs is a quad 18", I think that if I had it to do over again I'd skip the quad & just order two of the dual 18's with dual amps in each. While those 24" drivers would certainly be a sight to behold, I expect that they'd just be overkill. Two dual 18's should rock the house unless you like to crank the volume up significantly louder than I do.