Oae Ui1) They carry the FULL frequency range. You lose nothing in the transmission.
2) Crazy as it might sound getting a pair of CD3000's or HD600's may be completely unnecessary. The supplied headphones are that good; in fact some even consider them to be superior when it comes to movie watching
3) Take the money you saved by not buying a pair of CD3000's and get yourself a nice receiver with digital optical in/out's.