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O2 AMP + ODAC - Page 198

post #2956 of 3453
Quote:
Originally Posted by r010159 View Post

Has anyone noticed the highs are a bit emphasized on many jazz and rock albums. At first I thought it was the O2" but since the O2 has a flat frequency response, I am thinking it is the recordings. This particularly shows up with guitar work.

Bob

 

Same here with a DT990 on O2. I think that the O2 with its neutral sound does nothing to soften the emphasized treble (and bass in case of my DT990). With the right music, it's big fun, but I can imagine that some listeners will have problems with that combination.

 

Joachim

post #2957 of 3453
It's smooth as butter with my HD 650's.
post #2958 of 3453
Quote:
Originally Posted by jring View Post
 

 

Same here with a DT990 on O2. I think that the O2 with its neutral sound does nothing to soften the emphasized treble (and bass in case of my DT990). With the right music, it's big fun, but I can imagine that some listeners will have problems with that combination.

 

Joachim

 

Yes, it can be fun. But after listening to these particular albums for weeks, and then when I listen to an amp that colors the sound a bit to be more "analog" like, I find it is a nice break for my ears. I can see why some like tube amps.

 

Bob


Edited by r010159 - 5/26/14 at 4:07pm
post #2959 of 3453

I have been comparing the OSAC/O2 to other more expensive ones using Amazon's loaner program. ;) A recognized $400  DAC/amp was not as good as the O2. So I purchased what I thought to be a very good DAC/amp, the Duet 2, that is used by some mobile recording artists. This is where I went to the heart of the matter by thinking that this should be a good and accurate DAC/amp. Keep in mind this is a $500 DAC/amp that until recently used to sell for $600

 

I have noticed some differences. First, the Duet has more depth to its soundstage. Also the upper frequency sounds like from the cymbals come across a bit more clearly. I think this is related to jitter. And the Duet does have a different sound signature probably done on purpose. It give a more analog like sound to the music. And the songs which go into clipping do sound much better.  I can see some of the reasons why there are people that prefer analog gear like tube amps.

 

[deleted useless information]

 

So with respect to $300 and even $400 DAC/amps, IMO the ODAC/O2 competes well. We are definitely getting our moneys worth.

 

FWIW

 

Bob

 

O2/ODAC = dry martini

Duet = martini with more vermouth

 

A matter of taste.


Edited by r010159 - 5/26/14 at 7:35pm
post #2960 of 3453
Quote:
Originally Posted by Zorrofox View Post

It's smooth as butter with my HD 650's.

 

It looks like the particular selection of headphones can make the difference.

 

Bob

post #2961 of 3453
Quote:
Originally Posted by r010159 View Post
 

 

Yes, it can be fun. But after listening to these particular albums for weeks, and then when I listen to an amp that colors the sound a bit to be more "analog" like, I find it is a nice break for my ears. I can see why some like tube amps.

 

Bob

I'm glad you guys are broadening your horizons.  Basically I also think that for the money and up to about 300-350 USD the ODAC/O2 (but more the dac than the amp) will hold its own and be hard to beat.  But there IS better/more enjoyable, never doubt it.  In the strictly objective domain I believe agdr's version of the desktop ODA is a fine example.

 

I'm on the fence between tubes and ss gear.  I like a slightly warm sound but dislike the typical 'lush' 'syrupy' tube sound (which is just an indication of an improperly conceived/built tube amp imo but that aside).  But any colouring I try to do via my headphones.  This probably also explains Zorrofox's impression as what he describes seems to jibe with the HD-650 sound signature.

post #2962 of 3453
Yes, that was the point I was trying to make. The O2 acts like a clear window on the music and/or equipment. I also own a pair of Q701's and they sound very bright and edgy. They sound like that on everything though but even more so via the O2.

I'd also like to try a tube amp but in the back of my mind I suspect that a tube amp is only really adding distortion. With some headphones and/or music this added distortion will make for a better sound but I suspect that won't be the case with every possible combination.

We've all read many times of the special synergy between the Crack and 650's but this surely means that with other headphones this synergy is lost and in fact the Crack possibly makes things worse.
post #2963 of 3453
The Crack is an OTL amplifier and works best with high impedance headphones where voltage swing is more important than current delivery. XD
post #2964 of 3453
Quote:
Originally Posted by miceblue View Post

The Crack is an OTL amplifier and works best with high impedance headphones where voltage swing is more important than current delivery. XD

Yes but what does this actually mean in sonic terms? What would I expect to hear change in the sound?
post #2965 of 3453
Quote:
Originally Posted by Zorrofox View Post


Yes but what does this actually mean in sonic terms? What would I expect to hear change in the sound?

I think that it's more about the actual needs of headphones.  Some need high voltage swings to generate sound (I believe high impedance 300-600ohm), while others need high current (think orthos).  So if you have the former, the Crack will work well... if you have the latter, you will run into problems because you will be asking the amplifier to provide too much current.  i.e. operate outside of its designed operating state.  (I would guess sonically, you'd have more distortion.  In the same sense that if you have too high an input signal on the O2 and have the wrong gain selected, you get clipping, as you are outside of the design envelope.)


Edited by greenkiwi - 5/27/14 at 12:27am
post #2966 of 3453
Well its output impedance is some 120 ohms or something too, so that in itself makes the bass more woolly and ill-defined for lower-impedance headphones. That sound happens to sound okay with a K 701 on the other hand.
post #2967 of 3453
Thanks guys, that helps a bit.
post #2968 of 3453
Quote:
Originally Posted by miceblue View Post

Well its output impedance is some 120 ohms or something too, so that in itself makes the bass more woolly and ill-defined for lower-impedance headphones. That sound happens to sound okay with a K 701 on the other hand.

 

That's it exactly.  I know users with T1's and HD800's also report the Crack as pairing very well with them, it seems just about any high impedance headphone sounds great with it. In my opinion the reason why many people rave about the HD600 series with the Crack is they are normally a laid back dark sounding headphone, the Crack give them that bit of dynamic energy they are lacking.

post #2969 of 3453
Quote:
Originally Posted by mcandmar View Post
 

 

That's it exactly.  I know users with T1's and HD800's also report the Crack as pairing very well with them, it seems just about any high impedance headphone sounds great with it. In my opinion the reason why many people rave about the HD600 series with the Crack is they are normally a laid back dark sounding headphone, the Crack give them that bit of dynamic energy they are lacking.

 

For T1, it's hard to believe you need high powered amp to drive it to it's best performance. (Talking about > 1W amps) I do believe tube amp makes T1 sound different and people like it but definitely not because tube amps deliver more power than O2 but it's because of everything else tube amp adds to the signal.

 

O2 in itself has enough voltage swing (through a wall power at 7Vrms) to drive T1 properly to very high volume level. But it's definitely has not enough current for the Orthos. Which is where the ODA comes in.

post #2970 of 3453

Does anyone have the ODAC and run Linux as an OS? I run PCLinuxOS 64 and want to verify that the ODAC works and is recognized with the OS before purchasing.

thanks for any help

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