I have to suggest, hopefully without disrespecting any quadie purists, that you have a perspective of multichannel music, not in terms of vintage quad, 5.1 or Atmos for example. It all is multichannel, but different in its content delivery and technology. However, there are some of us here who maintain a 4.0 system by choice, and all the above (quad, 5.1, Atmos) sounds tremendous. Others have full blown Atmos+ systems and those sound tremendous.
I look forward to venturing into 6.1 and Atmos someday, but enjoy all multichannel (MC) on my 4.1 system.
I say this so as not to limit yourself to trying "quad" per se. There is so much content out there, there's no reason to think in terms of any single delivery technology or system. At least thats my opinion. There are some QQ / MC enthusiasts that will absolutely not listen to any streaming content and others who will absolutely not utilize Stereo 2 Surround technology (i.e. generating multiple channel music from stereo via algorithms & circuitry / programming rather than a human mixing engineer). Each finds pleasure in any of the myriad of aspects of the hobby!
Anywho...just my thoughts as you start to develop your own definition of how or why you enjoy the wonders of immersive music.