Koss? Hooked up to an HD tv?
Bro ...
I work at best buy...
koss isnt something id buy for my worst enemy, we get so many of those back - they SUCK!
the one above me is more than likely a correct answer.
In your home audio, there are always bottlenecks. HD tvs have advanced processors, considering they have to decode 5.1 surround sound from HD in some instinces, the koss is a 99 (maybe you were a big spender and got the 199.99 1000watt one?) paper weight.
I hope you got it free as a promotion.
Otherwise, i'd take it back (if its in the first 30 days)
Say you want to upgrade, spend another 300-400 bucks for seperates, and actually enjoy your audio/HD (probably expensive, no?) experience.