Quote: Absolutely I didn't mean to put down the MS-Pros,  they do have some plus's over the full magnums, so I am hoping the V4 plus orenholz cups are the best of both world.   Headphone choice is a very personal thing,  I really believe that the best headphone for one guy's head aren't...

You could try gently sanding the enameled wire with a file then solder a jumper down to the pin.

  This O2 I built is pretty much blowing me away with my Magnums,  amazing detail.   For Grados instead of clipping the gain resistor has anyone thought about bypassing the first stage completely,  I mean if we have the gain set at 1 why do we need U1 and all those ceramic caps in the...

I remember buying grey market MS-Pros for $550 new off ebay a while back,  thought I was set for life.   Then I came across a pair of V2 Magnum lites for a couple hunded bucks and there was just no comparison.  The MS-Pros were way to airy and lacked impact compared to the V2's so they went to...

Quote:  I also hate the Benchmark sound, so I would try wolfson and pcm1704 based dac's first. But its impossible to predict what one prefers,  famous speaker designer Lynn Olsen said it important to get advice from people who have similar hearing preferences but they are hard to find. ...

the dsp1 would have to go   Quote:  

Its just sad to me that the ref1/ref7 have such an archaic oversampler.  Once I tried the DSP rev 5 and didn't like it I knew it was time to move one.  Kingwa had been taken advantage off by the dsp programmer and dropped support, then he moved away from the superior PCM1704, rest is history. ...

Quote: FYI:  The stacker has a lower output impedance than the O2.    

Killki    

Quote: Best headphone amp post I've seen in months,  blows away all the meanlingless meter readings over at that blog about oxygen.  Really puts things in perspective.  Thanks.     Also read a few pages back,  you should can be upsamplin with sox using that 2x filter,  then the...

Quote: Interesting that the AD2000's have that up close midrange,  I need to try these,  its why I only listen to Sextetts and Grados  

Quote: Yes a small ceramic right at the heater pin really helped mine,  this type of tube are notorious for oscilating by picking up HF off their pins.     edit:  also yes I never would have thought about until I felt the dc heater supply hetsink vibrating,  grounding it quickly...

Listening breifly to my O2 trying to get my head around its popularity.   It is very transperant,  one can distiguish between my cheap DAC vs my expensive one very easily.  But I can't get beyond the sibilance mentioned earlier,  maybe its something else causing it but it isn't there with my...

  For a studio headamp the O2 is not the right choice.  The OP needed up to 800 ohms capable,  probably meaning he is replacing an amp for phones that he uses with a 680 tap which is common on old mixing boards.  Its easy to infer he is using older low efficient high ohm studio headphones.  ...

Quote: Whats wrong with EHHA revA?  should be under $400 and unlike any other DIY tube project out there is can output 14Vrms unbalanced output,  that IMHO makes it the king of all DIY tube amps. Can power just about any headphone.   Plus it has very low distortion.  Yea we all wish...

When you consider that most DAC's output a higher Vrms than a headphone can handle and a lot of them have a low enough input impedance to drive headphones directly.   Thats when you realize that we need headphone amps for volume contol/impedance matching in most cases.   So the volume control...

Quote: I have an spud amp that is similiar to this one.  It can be worthwhile to ground the heatsinks for the heaters,  they tend to pick up the EMI from the transformers ( I saw 60hz @ -90 reduced to -100db) and this was a separate chassis.  Another thing to try would be adding ...

Its not jitter,  something you changed in your computers config.  Did you install anything in those three months?   Do you have SP1 ?  There is an important update to the win 7 usb drivers that wasn't included in the initial sp1 update,  make sure you get them both.  This is fixable but you are...

Quote: I am a huge fan of the quality of Audi-gd products but agree on this one,  I got burnt buying a used NFB12 not knowing that changng filters requires smd work rather than jumpers,  its not a huge deal but when two totally different products are selling on the market with the same...

Quote:   Hate to say this but doesn't this make you think?   Of the usb audiophile high quality firmware, Rankin's UAC 1.0 asynch code has the longest history,  its only redbook but it doesn't seem as touchy as the newer stuff an it works with M$'s native drivers (zero software...

Is Symphone's closed for the Holidays?  Anyone heard from Ryydon recently ?

Quote: This has always been my thoughts on the subject to a key.  But was recently proposed that should the 144dB figure be attenuated as it typically is,  does that leave a hirez DAC with more indivudial steps or "resolution" than a 16 bit.  Hard to communicate what I am saying...

Quote: Are you on XP ?    Win 7 is much less prone to dropouts than xp IME.

Legion of Mary (jerry Garcia Band circa '74-'75).  The commercial vol 1 & 2 are amazing with Grados,  but the Bob Menke's recordings in 24/96k transfer probably capture the essence of the electric guitar better than anything I have ever heard.  Fusion jazz guitar at it best and only Grados can...

Quote: Found this thread as I was looking for an FPE template to finish up this O2 build,  man this post doesn't inspire a lot of confidence. " My headphones weren't sibilant before but now with the O2 they are?"   Kinda makes you think maybe just maybe headphones in general aren't...