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The point of using LOD because of bit depth? - Page 2

post #16 of 19
6/26/11 at 9:25am

I have no idea how to resolve the problem of my ZuneHD.

The line-out feature is inaccessible as no official cables are made and any DIY attempts have failed as they are unable to unlock the line-out feature.

 

Im really stuck as I love the Zune and dont want to replace it, but, as LO is alot better, I dont know what to do.

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post #17 of 19
6/26/11 at 9:52am
Thread Starter 

Looks like PGA2320 has THD+N of 0.0003%.   That's an order difference from an external portable amp(based on ibasso specs).  So, if you have pretty efficient headphones(ER4P, UM3X, Customs), it is probably good to use headphone out since headphone out has less THD than with external amp. smile.gif  Thats if PGA2320 is used, but I'm assuming the THD+N is in the same range for other volume control chips.  So headphone out will have cleaner signal than through an external amp.  If you want to amp, bypassing the volume control chip could be better, can you hear the difference since it's an order different value than a headphone amp's THD+N value.


Edited by user02 - 6/26/11 at 10:01am
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post #18 of 19
6/26/11 at 3:45pm

 

 

 


Quote:
Originally Posted by user02 View Post

Well, I'm relieved to hear that(quality of the attenuator is of another matter), but is there any DAPs anybody know of that throw away bits for lowering volume?


The vast majority of DAP's discard bits to reduce volume. 

 

Quote:
Originally Posted by user02 View Post

Looks like PGA2320 has THD+N of 0.0003%.   That's an order difference from an external portable amp(based on ibasso specs).  So, if you have pretty efficient headphones(ER4P, UM3X, Customs), it is probably good to use headphone out since headphone out has less THD than with external amp. smile.gif  Thats if PGA2320 is used, but I'm assuming the THD+N is in the same range for other volume control chips.  So headphone out will have cleaner signal than through an external amp.  If you want to amp, bypassing the volume control chip could be better, can you hear the difference since it's an order different value than a headphone amp's THD+N value.


Im not sure how ibasso came up here, or if I agree with this. 

 

From teh ibasso p4 product manual, the ibasso has 0.0015%thd

Ken Rockwell's test of the ipad says 0.025%THD into 75ohms:

 

http://www.kenrockwell.com/apple/ipad-1-audio.htm

 

Something like the headamp Pico rocks THD in the "wow" range at 0.0009%

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post #19 of 19
6/26/11 at 4:04pm
Thread Starter 

Interested in Pico now(need to be verified to be sure of the value), but I wonder at what load the THD was that much?  Based on ipad's data, the amp's THD value is dependant on load impedance.  So, I would I assume so for other amplifiers.  I'm wondering if there is a equation or something that explains that.  I'm guess Apple's amp may have been clipping to cause such level of distortion(probably has to so with supplied power to the amp, but ipad should have sufficient supplied power to it's amps), since it happens at high loads.  Also, the ipad is not a dedicated DAP, and it has a motherboard, so audio circuit may not be isolated properly.  That can be said for ipod touch also, but based on the sizing ipad may have a much larger and nosier circuitry. I want to know what the THD is at 8-32 ohms for ipad.  
 

Quote:
Originally Posted by nikongod View Post

http://www.kenrockwell.com/apple/ipad-1-audio.htm
Something like the headamp Pico rocks THD in the "wow" range at 0.0009%


 


Edited by user02 - 6/26/11 at 4:18pm
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