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O2 AMP + ODAC - Page 208

post #3106 of 3214
Hey folks. Check out this statement...

http://www.head-fi.org/t/197776/sennheiser-hd650-impressions-thread/18120_40#post_10677481
post #3107 of 3214

Sorry but he is right.

post #3108 of 3214
Quote:
Originally Posted by mcandmar View Post

Sorry but he is right.
I concur. HD650 on the Bottlehead Crack is probably one of the most enjoyable setups I've heard.
post #3109 of 3214
Yeah but he wasn't talking about the BH Crack and his suggestions were way more expensive than the shortlist provided by the op.

I need Crack.
post #3110 of 3214
Quote:
Originally Posted by adydula View Post
 


I inserted an ammeter in a USB cable and and never saw more than 50ma or so of current draw...

 

Alex

 

I haven't but I found a quote by the designer stating 1W. Although I have seen experienced weird behaviour of my ODAC in low voltage situations (lots of hungry arduino stuff on a neighbouring usb port of my laptop).

 

Joachim

post #3111 of 3214

I saw that as well, but I cut up a perfectly good USB cable and inserted a ammeter in series with the +5 vdc line... and had to see this for myself.

 

I was surprised... there is not that much circuitry in the ODAC SMD PC card....

 

Alex

post #3112 of 3214

Just checked my notes, i measured mine at 57ma playing a 0db sine wave into a 100k load.  I too was surprised at how low it was, and due to the lack of power supply filter caps there didn't seem to be any noticeable startup peak.

post #3113 of 3214
Quote:
Originally Posted by mcandmar View Post
 

Just checked my notes, i measured mine at 57ma playing a 0db sine wave into a 100k load.  I too was surprised at how low it was, and due to the lack of power supply filter caps there didn't seem to be any noticeable startup peak.

57mA into 100k load is 5.7V peak-to-peak - which is 2Vrms, ODACs output.

Lower load would result in higher current.

post #3114 of 3214
Quote:
Originally Posted by BenF View Post
 

57mA into 100k load is 5.7V peak-to-peak - which is 2Vrms, ODACs output.

Lower load would result in higher current.

 

Indeed although really low ohm loads are not really feasible (or will sound horrible w/o an amp), as might higher sample rates...

 

Joachim

post #3115 of 3214

I have the 600/Crack as my current favorite set up at home. But I have an 02/0dac combo unit coming, I'll be curious to listen to the differences. 

 

I got the O2 mostly to power the LCD 2's I have on the way... until I build out either an M3 or Dynahi. 

post #3116 of 3214
Quote:
Originally Posted by liamstrain View Post

I have the 600/Crack as my current favorite set up at home. But I have an 02/0dac combo unit coming, I'll be curious to listen to the differences. 

I got the O2 mostly to power the LCD 2's I have on the way... until I build out either an M3 or Dynahi. 

I'm looking forward to your appraisal.
post #3117 of 3214
+1
post #3118 of 3214
Quote:
Originally Posted by Zorrofox View Post

Yeah but he wasn't talking about the BH Crack and his suggestions were way more expensive than the shortlist provided by the op.

I need Crack.

Crack sounds like it would be a pleasurable experience. wink.gif
Edited by r010159 - 7/5/14 at 12:16pm
post #3119 of 3214
Quote:
Originally Posted by Zorrofox View Post


I'm looking forward to your appraisal.

 

I need to dig out some of my testing equipment to better volume match, as well as remove the dac from the evalution - however initial impressions are that the O2 (via the ODAC) with the HD600s is very clean sounding. Maintains all the excellent character of the headphone. I do find myself reaching for the high-gain button - which is not surprising. I still think the 600 + Crack is a more musical combination - adding the slight harmonic distortion and "tubey" sound which warms up the 600 a bit. So that is my preference currently for general listening - but I do not think that in any way represents a more accurate sound - the 02 definitely takes the cake there. 

 

I did find the 02 to be slightly better (more apparent detail) than headphone out from the D100, which is surprising, as it has tested pretty well. And it could be that not perfectly level matching is at work there as well. 

 

All in all, the 02 is very competent as an amplifier, and at its price range, I wouldn't hesitate to recommend it. Ample power and control for the phones I have tested so far (Fostex T50RP, Beyer 880/600, Senn 600, Grado 225i, AKG Sextetts, Denon D2000, Beyer 1350) and dead quiet even with my TripleFi10s and Etymotic ER4. 

I will be curious to see how it handles the LCD 2s.

 

I'll also update my impressions (again, once I sort level matching) with the Lovely Cube. And, either the M3 or Dynahi - once I decide on which I'll be getting (if either). 


Edited by liamstrain - 7/5/14 at 2:11pm
post #3120 of 3214

I seriously don't understand why there is not more love for the O2 + HD-650/600. Makes no sense. To me it's a perfect match.

I guess it doesn't add anything to how it's normally going to sound. My HD-650 manages to sound great with most neutral amps.

The HD-650 actually sounds much better with the O2 than my Q701. I'll someday figure out why the Q701 is only so-so with the O2.

Wouldn't imagine it's a lack of power and it's not because I prefer more coloration.

 

I installed the OPA2277 in the O2 and the Q701 did improve somewhat.

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