I once read a few years ago when first investigating caves that you could have a live rock concert in your cave and the neighbours wouldnt hear it. Whilst this may be a little enthusiastic you can play your music loud - in fact very loud. Now that renovations are almost finished and we are prepped up for the winter we decided to dig around in some old boxes and find some forgotten DVD's.
The system we have is a Sony, 5.1 dolby digital etc etc. It is rigged up in the central room of the cave and tweaked for optimum performance. Now at this point I would like to say that my music taste is a bit variable...! For starters I put on Linkin Parks Reanimation DVD and then Metallica's amaligimation with the San Francisco Symphony Orchestra, both are optional on DTS and the sound in a cave is nothing short of impressive.
Why? Well the caves insulation properties dont just apply to temperature. Two meter thick walls simply do not let the sound go anywhere, there are no floor boards or carpets to absorb sound either which makes for crystal clear enjoyment. On a decent system the sound wizzes around the room anyway but in a cave room its clarity is unbelievable! The other noticable thing is lack of vibration so bass can be set higher than normal. High quality movies are also very good in Dolby and DTS. In short if you are a music lover or film buff then buy a cave!
Tubular Bells is also in the top 10... What are you listening to?