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O2 AMP + ODAC - Page 181

post #2701 of 3214
Quote:
Originally Posted by PTom View Post

I find the O2/ODAC combo sometimes sounds a bit harsh with the LCD 2, I'm not sure if this is due to the amp or DAC.
I've found that to be the case too, and I don't like the combo in that regards.
post #2702 of 3214

I have used all the players mentioned and have removed all but JRiver.

 

The main issue with players and with JRriver is setting it up correctly for bitperfect playback and the corresponding operating switches.

 

JRiver will produce bit perfect playback as long as you the operator knows what your doing....LOL.

 

There is an indicator that turns "blue" with it that indicates what it is getting in is going out....

 

JRiver has many, many settngs for a wide variety of things, very easy to mess up if your not thinking.

 

There support site is really good and there is a wealth of technological knowledge on their site.

 

I find the interface easy to use, and there are usually three different ways to view and set up etc.

 

A.

post #2703 of 3214

Audeze LCD-2 revision 2 the specs are:

 

• Impedance: 60 Ohms, nominal

• Maximum diaphragm excursion: 2.5mm p-p

• Efficiency: 91 dB/1mW

• Maximum output: 133dB, 15W

 

The O2 not only has lots of voltage, but it also has lots of current for low impedance loads that require it—like AKG K701s, Audeze LCD-2s ec...

 

There are many happy LCD-2 users using the O2. It has power to spare to drive the LCD-2 to hearing damaging levels and beyond.

 

The LCD-2 hits 110 dB with about 1 volt of input. Peaks of 110 dB are considered plenty loud by most people (hearing damage starts past 85 dB). 110 dB is standing on a sidewalk next to a jack hammer tearing up concrete. Even if you plan for 115 dB peaks, which is extremely loud, you only need about 1.7 Vrms which is 0.048 watts. The O2 can provide 5+ Vrms which is good for 124 dB SPL with the LCD-2. And that's running from battery power. If you really wanted to push the headphones to 133 dB you would need 14 Vrms which is 3.2 watts.

 

But, long story short, even at an ear splitting 124 dB SPL that's a peak voltage of 7 volts. Ohms law gives a peak current of 7/60 = 117 mA. The O2 has a peak current capability of 200 mA per channel--nearly twice what's required.

 

Again LCD2's are driven very, very well with the simple little ole battery powered or AC powered manner.

 

A.

post #2704 of 3214
Quote:
Originally Posted by adydula View Post

I have used all the players mentioned and have removed all but JRiver.

The main issue with players and with JRriver is setting it up correctly for bitperfect playback and the corresponding operating switches.

JRiver will produce bit perfect playback as long as you the operator knows what your doing....LOL.

There is an indicator that turns "blue" with it that indicates what it is getting in is going out....

JRiver has many, many settngs for a wide variety of things, very easy to mess up if your not thinking.

There support site is really good and there is a wealth of technological knowledge on their site.

I find the interface easy to use, and there are usually three different ways to view and set up etc.

A.

Is this blue "indicator" on the Mac version? Where should I see it?
post #2705 of 3214
Quote:
Originally Posted by adydula View Post
 

Audeze LCD-2 revision 2 the specs are:

 

• Impedance: 60 Ohms, nominal

• Maximum diaphragm excursion: 2.5mm p-p

• Efficiency: 91 dB/1mW

• Maximum output: 133dB, 15W

 

The O2 not only has lots of voltage, but it also has lots of current for low impedance loads that require it—like AKG K701s, Audeze LCD-2s ec...

 

There are many happy LCD-2 users using the O2. It has power to spare to drive the LCD-2 to hearing damaging levels and beyond.

 

The LCD-2 hits 110 dB with about 1 volt of input. Peaks of 110 dB are considered plenty loud by most people (hearing damage starts past 85 dB). 110 dB is standing on a sidewalk next to a jack hammer tearing up concrete. Even if you plan for 115 dB peaks, which is extremely loud, you only need about 1.7 Vrms which is 0.048 watts. The O2 can provide 5+ Vrms which is good for 124 dB SPL with the LCD-2. And that's running from battery power. If you really wanted to push the headphones to 133 dB you would need 14 Vrms which is 3.2 watts.

 

But, long story short, even at an ear splitting 124 dB SPL that's a peak voltage of 7 volts. Ohms law gives a peak current of 7/60 = 117 mA. The O2 has a peak current capability of 200 mA per channel--nearly twice what's required.

 

Again LCD2's are driven very, very well with the simple little ole battery powered or AC powered manner.

 

A.

Have you personally heard the LCD 2 with the O2 amp? If so, did you find any problems with SQ i.e. like harsh treble?

post #2706 of 3214

PTom,

 

In my posts I have indicated that I have LCD2's R2's and have had many hours with them on 2 separate O2 Amps and ODAC's...with very good results.

 

I also had at the time a Schitt Asgard and a Schitt Lyr (6 watts) and the I sold those and kept the O2's..that should tell you something.

 

There are so many variables, and personal tastes and opinions.

 

I wanted people to know that there are many happy LCD2 owners using the O2 amp with great success.

 

Accuracy and transparency are very important to me....I want an amp to just be an amp...and not add or detract with anything else other than perfect amplification to the incoming signal. The O2 does this marvelously well.

 

Having an amp like this or a V800 etc...takes this variable out of the picture and you don't have to worry about this part in the chain.

 

I wonder if people really take the time to make sure the source material, the amp gain settings, player setups are correct to allow bit perfect playback.

 

Its easy to start mucking with stuff and not understanding what your doing and just trusting your ears, brain and what mood and how much beer you might have had!!! LOL.

 

All the best

Alex

 

NOTE: Garbage in Garbage out......

post #2707 of 3214

I don't have the Mac version but here is the PC version and where the "blue" indicator lights up when playing in bitperfect mode..

 

If you hover over this icon you will see no changes being made message when its working correctly.

 

You can go in and change or modify behaviors depending on bitdepth, number of channels and lots of other stuff.

 

You can even go in an reduce the bit depth to see what effect if any on SQ.

 

Alex

post #2708 of 3214
Quote:
Originally Posted by PTom View Post
 

I read that Audeze recommend an amp that can output at least a couple of watts into a 60 ohm load and the O2 seems to come up short in this respect at least so maybe this is why they don't work perfectly with the LCD 2?

 

What are some objectively well performing amps that could output more than 1 watt into a 60 ohm load?

Check out the Beta 22 thread if you want to know where Audeze headphones are most talked about.  My Fiio E17 can drive my LCD-2, does it drive well? No, it does not.  Does the O2 drive it well, no it does not.  Just because it can draw enough power does not mean it will drive it well.   Go to meets and look at what the Audeze headphones are driven by and ask them why they use those amps.  If people are using O2 to drive their LCDs it's because they have not tried more capable amps.  

 

There are two amps that are recommended in the LCD thread, Beta 22 and Schiit Mjolnir(people don't recommend certain amps for no reason).  You can build Beta 22 in single ended or balanced configuration, and the Mjolnir is balanced.  

 

Specs are specs, and I know how to read them.  They don't have the whole picture when it comes to what comes out of the headphones.  I would recommend IEMs, but not recommend HD650(sounds terrible) and Audeze phones for the O2.  Having the specs to power them, and how they are driven is another.


Edited by SilverEars - 4/20/14 at 7:14am
post #2709 of 3214
^ +1.
post #2710 of 3214

Kool I humbly disagree....

 

Its your bucks enjoy...

 

A.

post #2711 of 3214
Quote:
Originally Posted by adydula View Post

I don't have the Mac version but here is the PC version and where the "blue" indicator lights up when playing in bitperfect mode..



If you hover over this icon you will see no changes being made message when its working correctly.

You can go in and change or modify behaviors depending on bitdepth, number of channels and lots of other stuff.

You can even go in an reduce the bit depth to see what effect if any on SQ.

Alex

Yes, I see that. Sometimes anyway. Other times I use the volume levelling functions.

Quote:
Originally Posted by SilverEars View Post

Check out the Beta 22 thread if you want to know where Audeze headphones are most talked about.  My Fiio E17 can drive my LCD-2, does it drive well? No, it does not.  Does the O2 drive it well, no it does not.  Just because it can draw enough power does not mean it will drive it well.   Go to meets and look at what the Audeze headphones are driven by and ask them why they use those amps.  If people are using O2 to drive their LCDs it's because they have not tried more capable amps.  

There are two amps that are recommended in the LCD thread, Beta 22 and Schiit Mjolnir(people don't recommend certain amps for no reason).  You can build Beta 22 in single ended or balanced configuration, and the Mjolnir is balanced.  

Specs are specs, and I know how to read them.  They don't have the whole picture when it comes to what comes out of the headphones.  I would recommend IEMs, but not recommend HD650(sounds terrible) and Audeze phones for the O2.  Having the specs to power them, and how they are driven is another.

There's a Crack+Speedball in the FS threads and I'm looking at that as a potential end-game for my 650's. It's a lot of money for me though.
post #2712 of 3214
Quote:
Originally Posted by SilverEars View Post
 

Check out the Beta 22 thread if you want to know where Audeze headphones are most talked about.  My Fiio E17 can drive my LCD-2, does it drive well? No, it does not.  Does the O2 drive it well, no it does not.  Just because it can draw enough power does not mean it will drive it well.   Go to meets and look at what the Audeze headphones are driven by and ask them why they use those amps.  If people are using O2 to drive their LCDs it's because they have not tried more capable amps.  

 

There are two amps that are recommended in the LCD thread, Beta 22 and Schiit Mjolnir(people don't recommend certain amps for no reason).  You can build Beta 22 in single ended or balanced configuration, and the Mjolnir is balanced.  

 

Specs are specs, and I know how to read them.  They don't have the whole picture when it comes to what comes out of the headphones.  I would recommend IEMs, but not recommend HD650(sounds terrible) and Audeze phones for the O2.  Having the specs to power them, and how they are driven is another.

Thanks, that's quite interesting, Mjolnir sounds interesting but it's not easily available at a reasonable price this side of the Atlantic. Also heard Burson conductor and Meier Concerto are worth looking at for the LCD 2.

post #2713 of 3214
Quote:
Originally Posted by SilverEars View Post
 

Specs are specs, and I know how to read them.  They don't have the whole picture when it comes to what comes out of the headphones.  I would recommend IEMs, but not recommend HD650(sounds terrible) and Audeze phones for the O2.  Having the specs to power them, and how they are driven is another.

 

I have yet to find a single track I dislike with my HD650 and O2 (booster mod) + ODAC, in fact I enjoyed the combination for a good while before the O2 was modded. The HD650's however do have a history/myth of the pre-2007 Sennheiser veil, so a good amount of HD650 reviews with the Objective stack is a merry mixture of thoughts.

post #2714 of 3214
Quote:
Originally Posted by JacobLee89 View Post
 

 

I have yet to find a single track I dislike with my HD650 and O2 (booster mod) + ODAC, in fact I enjoyed the combination for a good while before the O2 was modded. The HD650's however do have a history/myth of the pre-2007 Sennheiser veil, so a good amount of HD650 reviews with the Objective stack is a merry mixture of thoughts.

Sonically speaking, I favored the 650 with Tubes.  Tubes are regarded as having higher distortion and providing 2nd harmonic distortion that people may favor the coloration of the sound.  

 

At the meet I've heard the LCD-3 with Isabella, a tube amp which sounded fantastic, also Alpha Dogs mr. speakers brought with his top tube amp sounded fantastic.  I believe amps generally do not have the level of distortion as the headphones.

 

What is this booster mod you speak of? I'm curious to try it.  Thanks.


Edited by SilverEars - 4/20/14 at 8:40am
post #2715 of 3214
Quote:
Originally Posted by adydula View Post
 

PTom,

 

In my posts I have indicated that I have LCD2's R2's and have had many hours with them on 2 separate O2 Amps and ODAC's...with very good results.

 

I also had at the time a Schitt Asgard and a Schitt Lyr (6 watts) and the I sold those and kept the O2's..that should tell you something.

 

There are so many variables, and personal tastes and opinions.

 

I wanted people to know that there are many happy LCD2 owners using the O2 amp with great success.

 

Accuracy and transparency are very important to me....I want an amp to just be an amp...and not add or detract with anything else other than perfect amplification to the incoming signal. The O2 does this marvelously well.

 

Having an amp like this or a V800 etc...takes this variable out of the picture and you don't have to worry about this part in the chain.

 

I wonder if people really take the time to make sure the source material, the amp gain settings, player setups are correct to allow bit perfect playback.

 

Its easy to start mucking with stuff and not understanding what your doing and just trusting your ears, brain and what mood and how much beer you might have had!!! LOL.

 

All the best

Alex

 

NOTE: Garbage in Garbage out......

My setup is O2/ODAC (Epiphany Acoustics) and I use lossless files (FLAC) using Vox (no equalization applied, all settings on default) on a Macbook Pro (Late 2010 version). The lowest amp gain setting is used. The LCD 2 Rev 2 as well as the amp/DAC all use stock cables. I'm not sure which part of the chain I should look into adjusting?

 

The harshness I observe on certain tracks could be due to the mastering but well known albums like Coldplay/Adele: Greatest Hits sound distractingly harsh with respect to the treble. 


Edited by PTom - 4/20/14 at 8:44am
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