Weren't you trying to sell or trade your Vali for an O2 a couple days ago? I'm assuming since you've already made a couple comments about the O2 in relation to the Vali that you're trying to get a second O2 on top of the one you already have?
On the topic of transparency, I thought you made a comment on the Vali being very transparent earlier in this thread? At least with the Q701 or whatever. I know you don't like the Vali with the HD650, but the Vali can't go from being transparent with the 701 then magically turn into something not transparent with the HD650. Transparency itself is a very ambiguous and nonsensical word in the first place, but ideally something that is transparent should only bring through the sound of the headphone. Just the way I've seen you comment in this thread and the HD650 thread makes it seem like you should stick with the O2, and never get any other amp, because you're always so quick to pass everything off as coloring the sound or adding things that shouldn't be there. Staying with the O2 would probably save a lot of headache on your part and others'.
That's the most interesting post you've made to me in awhile and you're correct on most parts.
I had the O2 and loved it, but it was not quite as good as my Micro. I was stupid and said "but this treble could be a little smoother" and sold it and tried another amp. Remind me not to do something that dumb again...
O2 is great but it's not the world's best amp under $500.
When I tried the modded Q701 with the Vali (on ANY source) it sounded amazing. I was almost a raving fanboy of that combo. It seemed totally transparent and without any change at all from my Micro Amp. No fuller mids, no smoother treble. No nothing. Same results on the K400. The Micro (only with Astrodyne) is like an O2, but perhaps 1% fuller mids and very very slightly smoother treble. Ultra subtle differences.
You're exactly right that an amp can't go from being transparent from one headphone to colored on the next. This is a big mystery. I would say the Vali + Denon 1920 (2x WM8740) + HD-650 was kind of enjoyable, but a warmth overdose. My only idea is that it's just not a good match, but some seem to love it. Again, maybe my HD-650 is goofy. If people want to say I have bad hearing that is OK!
My idea of a transparent amp is just something that sounds equally good with 90% (maybe not IEMs or Orthos) of headphones out there without it changing them too much. If what I attach is slightly colored then I expect to hear it. Nope, I didn't cut and paste all that nonsense from the NWWAVV guy website. I love how with my Micro and the O2 I could attach anything as a source without the amp changing a thing. I could get my Micro to sound like a crappy Coby 512mb player if I wanted. Ok maybe with slight improvements. Magni was not too far off from this description too.
I like some nice coloration at times. I'm ok with the warmer sounding Wolfson DACs and the E17 has some nice coloration as well. When I bought the Vali I would have been crazy to expect it to be transparent.
I probably go through too many amps, but for me to keep it, it needs to be perfect. My goal all along has been to top what I already have (under $500) and the O2 got the closest. I didn't really buy the Vali to do this though and that's pretty important.
BTW I got the Ifi iCAN and an O2 incoming. Yes, i'm sorry to say that I swapped the Vali out for an O2. Vali is better for the Q701 though
So I guess I took your advice yesterday and got another O2. Should have kept it!
I really need to go to a meet and try a bunch of amps. I will try not to get beaten up while i'm there