If I had the budget to buy the HD600, DT880, and Q701, I would buy the HD800 instead.

I still really enjoy using my Asus Essence One Muses. Good amp and great DAC. Makes a great preamp with my BH Crack too.

I plugged my HD800's straight into my iPad this morning (via Grado 1/4" to 1/8" adapter) and thoroughly enjoyed some Nickel Creek streaming from Spotify at 320 Kbps. No external DAC or amplifier needed. :D

^ What he said

Haha, yeah, I should have known...

Well it looks like I will be keeping my Crack after all. Lots of lookers but no takers. Oh well, I probably would have had sellers remorse anyways. At the moment I'm enjoying the soundtrack from the movie "Master and Commander" via Oppo BDP-83 > Asus DAC > Crack > HD800. So good :D

I have a pair of HD558's and also Grado SR60i. I love them both for different reasons but when I want a "fun" headphone I reach for the Grado every time. It is truly a punchy rock and roll headphone with a more "in your head" soundstage. The HD558 is the more "neutral" headphone with bigger...

  They are great little speakers! I bought mine around 1991 or 1992 as I recall.   When I put together my first home theater (5.1) in 1999, I simply added a pair of their Dipolar surround speakers and beefed up the bass with an inexpensive 12" Polk Audio subwoofer. That system served me well...

Me too!

Is it older than 5 years? DAC's go bad in 5 years. ;)

I bought mine about 3 years ago at a brick and mortar store. Maybe mine isn't the "anniversary" version?

      http://www.transcendentsound.com/Transcendent/Amplifier_Output_Impedance.html

Actually, don't get hung up on format. I have 320 Kbps MP3 rips of red book CD's that sound better than many of my SACD's.

Weird, mine has a different label...

Matt, in my experience, ENT's are among the most ignorant group of professionals WRT tinnitus. An audiologist is your best bet for help (and hearing aids). Do some reading on neural plasticity and tinnitus...