Hi Tatool, I think I can sympathise with your plight, but the main sonic advantage in having a wood floor to begin with is indeed the air cavity created by the riser. A concrete slab will at least tend to cause unwanted bass reflections. If you have some cinderblock walls to contend with as well you're in a bit of a pickle...and I guess if you also happen to be in a square shaped room, then you may as well hang a sign on the door that sez: 'abandon all musical hope ye who enter' ;P But, I'm serious when I say the air gap will help blunt and diffuse the bass reflection. Bass traps IME and IMO are rather largely overrated for perhaps an inexhaustable number of reasons. EQ is recommendable if you can work it into your system, particularly if it's digital. And for that matter don't overlook the importance of good power conditioning which can be especially benificial to someone dealing with bass problems like this, more than you might suspect. Sounds like you're already onto the right information, it's just that the how-to of the construction of the floor itself is one problem I haven't actually had to solve. I know in your case it's probably fraught with impracticalities to say the least, but I suspect sonically it's worth considering what it would take to solve the problem. Actually this is something you can very likely google. If you take the time with it I bet you'll come up with a good number of detailed enough examples of how others have solved this very issue. Hope this helps.
Hardwood floors in basement music room?
I currently have carpet over concrete, and I'm thinking about removing the carpet and installing engineered hardwood over a glued down underlayment, does anyone have any pro or cons on this. The underlayment I was going to use is a lumber liquidator product called Eco silent sound HD, they also have a cork underlayment .