the room i used the storm in is 12X20 . I listened to jazz, mostly instr. some vocal, especially female. Basically , i believe most people who listen to jazz, listen to it at the levels they believe if they were listening live in a venue,club,etc. most of the time it may be less, with the load that the storm carries you can cross it over a different frequencies, say 80, 120,etc. I personally believe that your ears are as good as a piece of gear or tech to tell you where the crossover should be....you take your favorite piece , especially bass and play it and make the choices...i used 80 as a crossover...since the arros do go down below that. let me say that the thunder will work very well, it is according to your volume level and money. i am elderly and been around tube.solid state and my hearing has been lost somewhat , but i believe my theory is sound , big volume, then bigger sub, but jazz ..it not rock...dwhitt