Just to satisfy my own curiosity (It's driving me nuts). The range of human hearing, on average, is said to be from 20 to 20,000 hertz. Assuming this is true, I was wondering.... * Is AC-3 (from laserdisc) capable of 20-20k? I'm assuming it is because LD technology was taken from the CD technology which had a 20-20k range. But I'm not sure on this. If DTS has a higher sampling rate than DD.... * What are the maximum sampling rates of CD's, AC-3 LD's, Dolby Digital DVD's, DTS DVD's, SACD's, and DVD-A disks? * Do DTS-ES, and THX-EX encoded DVD's have a larger sampling rate than their more mundane counterparts? Again, This is simply a topic that I'm curious about. Although in future it may be important when I decide to buy some new HT equipment.And thanks in advance for all the useful info!