Audio room floor question

Before yo start just make out 2 inch deep and 4 inch wide grooves into the concrete floor to use it for future cable laying . Use cutter for making these gooves or chanels . I would buy aluminum rectangular chanels to lay them into the grooves and provide 8x8 inch opening at all places needed . I would say go for 12 mm plywood fixed on to the concrete floor and fix it to the concerete floor using screws. This will completely cover the floor and alu chanels are under the plywood . then over the plywood , lay solid hard wood about about 1/2 inch thickness and fix it using adhesive and very small headless nails . Provide 8x8 inch wood tile ( removable with easy lift ) at each opening for cable laying .
Do not varnish or wax the wood top surface , just use some mild oil and water to improve the look, but leave the pores open for good absorption.

Sorry , one thing forgot in my earlier post : First you need to put a thin palstic or polyethylene film on the concrete floor and then lay plywood over it. this will prevent any moisture seepage from the concrete floor.

(http://www.enjoythemusic.com/magazine/manufacture/0502/) The effects that are experienced while recording(do to floor bounce), will affect your listening room's presentation: (http://www.synaudcon.com/site/author/pat-brown/the-floor-bounce-effect-mic-placement-for-equalization/) You may find this helpful: (http://mehlau.net/audio/floorbounce/)

You do not want to put any wood in contact with concrete. Plastic vapor barrier, filled with holes, will not prevent the wood from quickly rotting. Sleepers over sill seal, then you could put the plywood on the sleepers. This would eat up precious floor/ceiling height in your case and dramatically decrease your in floor heating efficiency.
Tile is an excellent finish product over concrete but it could effect the efficiency of your in floor heating, especially if you use a thick Mexican tile.

Stained concrete is a wonderful product, looks nice, easy to clean, durable and environmentally friendly and in your case, maintains the ceiling height.

If I were going to place in a wood floor, then I would try finding used planks from an earlier estate. Used wood will typically sound more organic and less shrill. And I totally agree with not putting the flooring directly over the concrete, meaning without some sort of a barrier.

Cork sheet that's 1/4 to 1/2 inch in thickness will be comfortable to walk on and it will provide an acoustic barrier. Any hard surface flooring like tile or concrete will cause sound waves to ricochet. This will also be a problem if the wood flooring is placed directly on top of concrete. As a hypothesis, I'm referring to decoupling the cement floor from the wood flooring above it, while allowing the acoustic presence of the wood to resonate. You definitely don't want to soundproof your floor or anything else, as this will totally kill your sound. However placing rugs on top of wood can stabilize acoustics without killing sonic presence.
IMHO