Just great. Another freakin' $650 I have to plow into the system. As soon as somebody buys my unused Noble X's that have about 30 min. on them, I'll put that $$ towards the tube power supply . . . they do look extremely cool at night! :)

I thought that the standard Sovtek tubes sounded great. I think before I start obsessing about tube rolling, I'd spring for the power amp for the WA7d's and see what that would do. The Fireflies are my first foray into tubes, and I am skeptical as to how much different tubes will really affect...

I just got mine through MassDrop and it is one gorgeous unit. I am using the solid state power supply and it sounds great on both my Fostex Purplehearts and my HD650's, so I am a happy camper. the only thing that I don't like about the HD650's is that they leak too much sound so that my wife...

Thanks for the info.  Because the drop was ending, I figured that I would give them a try,   I have a headphone amp, but as I said, I use my Fostex's at home.  These are strictly for travel.  However, I can definitely do without the "ravaging treble," LOL! 

I have a set of Etymotics HF5's . . . I'm thinking of upgrading to the Noble X.  Currently, I only use the Etymotics with my iPhone 6 or iPad and use Fostex Purpleheart  TH 00's at home.  I really like the Fostex sound.  The Etymotics have a nice sound but have little bass for me. Is it a...

You know what?  They're a great set of phones, and at the MassDrop price, cannot be beat.  My loss!  Damn you, MassDrop!  (just kidding . ..  MassDrop is great!)  My Fostex TH-00's from MassDrop seriously kick ass!

Yes, I consider myself properly "gazumped."  I hesitated in selling these earlier, obviously to my detriment! But, I have to hand it to MassDrop . . . they certainly kick butt! 

Ouch.  I didn't see the Massdrop.  That is a stunning deal for a kliller set of headphones.  Thanks for the tip.

I use an O2+ODAC rev. B amp with my 650's.  I think that it sounds great.  MassDrop has it for about $210 for the "desktop" version, although I bought mine at Mayflower Electronics for substantially more because the earlier drop was not closing for three or four weeks at that time.  MassDrop...

Yesterday, I installed an update to El Capitan pushed by Apple.  Whether it was something in the update or the fact that the iMac rebooted, the problem is no longer there and the distortion is gone!  In looking back on the issue, I am pretty sure that one of the things that I did when the...

the volume on VLC was 100%.  However, it was set at the same volume when I listened through the headphone jack on the iMac and the distortion wasn't there. :(  Plus, wouldn't the volume on VLC not matter because the ODAC has its own volume control to raise and lower the output?

If you are asking whether the iMac and the ODAC are plugged into the same wall outlet, the answer is "no," although they are both plugged into the same UPS.  Do you think that that could make any difference?  And if so, why has it worked perfectly since November up until yesterday?

Thanks for the response.  Unfortunately, adjusting the output volume to make sure that it wasn't clipping was the very first thing that I did, even before determining that there was an actual problem.  I never had the iMac's output volume at over 80% anyway, but even reducing it to much less...

My setup:  a 2014 iMac with i7 intel processor, 24 gig RAM, 1 Tb fusion drive, an O2+ODAC rev. B and a set of Sennheiser HD650 headphones.  All music resides on a Netgear 516 NAS in FLAC, probably 50% 16/44kz, and the rest 24/92 and some 24/192.  Music is played through the iMac using VLC or...