Originally Posted by Skylinestar
How is that possible?
Well, after checking out Dave's sig it looks like he has 4 x 18'' XXX drivers in an IB and he is adding 3 more soon! I would say just about anything is possible with that much firepower.
I believe that concrete is actually a great conductor of sound so if you have enough subwoofer up front you should not have any problems with tactile sensation. I would guess most people maybe don't quite have enough subwoofer to get the sensation they are after. And then for some people it will simply never be enough!
I can attest that my "smallish" built in subs contained in my Def Tech Mythos STS towers shake my main floor wood floor like crazy! So I am hoping my Orbit Shifter will be able to provide some tactile sensation via my concrete floor. I will be doing a riser as well and I anticipate that the sensation will be much greater for the second row riser. I am currently planning to put my OS on a sand filled stage and this will probably decrease the transmission of sound and I am a bit worried about this. Maybe I should place the sub directly on the concrete and only have the stage built in front of the false wall? I dunno.
The most insane tactile feel I have ever experienced was at member DesertDomes at the recent Omaha Home Theater tour. He has an in floor IB setup with 8 x 18" drivers. His floor is wooden and is likely near 80-100 years old. It shakes your entire body! Everyone in attendance had a huge grin on their face. It was actually a little bit too much for me but very very fun.
I am sure one also needs to consider distance to the source when attempting to get more tactile sensation.
You could always put a second sub on top of a riser like the one Roger described. My riser will be constructed in this fashion too.
I have had mixed results with tactile transducers. It can have an artificial on/off feel to it if not done correctly. I would rather have my bass be ''natural'' with all of the smaller increments of sensation intact. But, if my OS just can't go through my stage and concrete then I will look into tactile transducers and/or near field subs.
Edit: I would consider doing the raised floor just like XB described but my ceiling height is an issue. Maybe just a layer of plywood would help? This may or may not hinder any soundproofing efforts you have.