What is the ultra tuned too? if it is 20 hz is there going to be a 16 hz version (Ron,Tom)? Also just wondering if you can hit reference bass with dual 16 hz subs , which i think you can in most rooms with svs, why do most ppl prefer the 20-39's ? I know the 20-39's play a little louder. Is it just a personal preference, lack of under 20 hz material , or that the 16-46's are a shade under reference. Or that some ppls reference is louder than others, you know who you are.