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**Hifiman HE-400 Impressions and Discussion Thread** - Page 1018

post #15256 of 18673
Quote:
Originally Posted by Soundsgoodtome View Post


Volume leveling is done by digital attenuation. Digital attenuation = poor audio quality non-optimal audio

*edit: not optimal audio quality, although some people will not be able to hear depending on ears and gear.


It all depends. If you are playing 16-bit material with your DAC set to 24-bit, you get about -10 db of digital volume before it affects sound quality in the slightest. The reason being that the information shaved off by the digital volume control is limited to the extra 8 bits added by playing 16-bit material with 24-bits of headroom. 

post #15257 of 18673
Quote:
Originally Posted by manbear View Post
 


It all depends. If you are playing 16-bit material with your DAC set to 24-bit, you get about -10 db of digital volume before it affects sound quality in the slightest. The reason being that the information shaved off by the digital volume control is limited to the extra 8 bits added by playing 16-bit material with 24-bits of headroom. 


We're talking about Spotify in this particular case. Not sure if they're running their volume platform on 24 or 16 bit or if they're tied into Windows 32-bit float point. I searched through their FAQ and site and all they state is encoding and  bit rate. There is however an answer on their forum about volume equalization and how it does effect quality. This is answered by a Spotify rep.
---------------------------------------------------------------------------------------

Yes, you can turn the volume all the way up. Using volume equalization will still drop the volume down certain songs digitally.

Quote:
Originally Posted by DoctaCosmos View Post
 

either way why not just run the volume all the way up


Edited by Soundsgoodtome - 12/16/13 at 6:19pm
post #15258 of 18673

either way why not just run the volume all the way up

post #15259 of 18673

Has anyone here compared the HE-400 using different amps including the Aune T1?  Do they pair well?  I'm considering getting a T1 for my HE-400.  Even though some people have said that the T1 works well with it, I'm a bit confused because the T1 has an output impedance of 10ohms whereas the HE400 has 35ohm of impedance.  Shouldn't the HP have at least 8x the impedance of the output impedance of the amp to work well? 

post #15260 of 18673
Amps amplify. Keep the output impedance low and you'll easily reach loud dbs
post #15261 of 18673
Quote:
Originally Posted by Za Warudo View Post
 

Has anyone here compared the HE-400 using different amps including the Aune T1?  Do they pair well?  I'm considering getting a T1 for my HE-400.  Even though some people have said that the T1 works well with it, I'm a bit confused because the T1 has an output impedance of 10ohms whereas the HE400 has 35ohm of impedance.  Shouldn't the HP have at least 8x the impedance of the output impedance of the amp to work well? 

are you considering the Aune T1 b/c of a certain group buy website?? lol... I read that the tube amp only powers the DAC... it amps w/ a SS. kinda spoils the fun IMO.

post #15262 of 18673
The wheels on the bus are round like most headphones.
Edited by Soundsgoodtome - 12/17/13 at 2:04am
post #15263 of 18673
Quote:
Originally Posted by DoctaCosmos View Post

Amps amplify. Keep the output impedance low and you'll easily reach loud dbs

 

But earlier you said "just get a AV amplifier and use the headphone jack"....

 

Usually headphone jacks on AV amplifiers are a) very cheap / bad b) have output impedance 50ohm or worse....

 

Amps do amplify yes... That is about the only correct thing you have said so far

post #15264 of 18673

---mispost---

post #15265 of 18673
It was to my understanding that planar magnetic are different in terms of impedance matching to amps. Can someone shine some light on that?
Quote:
Originally Posted by Za Warudo View Post

Has anyone here compared the HE-400 using different amps including the Aune T1?  Do they pair well?  I'm considering getting a T1 for my HE-400.  Even though some people have said that the T1 works well with it, I'm a bit confused because the T1 has an output impedance of 10ohms whereas the HE400 has 35ohm of impedance.  Shouldn't the HP have at least 8x the impedance of the output impedance of the amp to work well? 
post #15266 of 18673
Quote:
Originally Posted by Soundsgoodtome View Post

It was to my understanding that planar magnetic are different in terms of impedance matching to amps. Can someone shine some light on that?

This is my understanding as well. To put it in perspective, I can put my Ember at 120ohm output impedance and have zero issues with my HE-4's. It just sounds more tubey instead of SS :)

post #15267 of 18673

Planar Magnetics still seem to suffer from a bit of driver control related to damping factor, but they do not change their sound signature at all from the amp's output impedance due to a flat impedance curve.

post #15268 of 18673

I belive its a hit and miss. Yes planar are less dependand on impendance output matching, but they get affected negativly by it.

 

How much? Subjective, only its clearly a lot less than dynamic.

 

It seems that Tube amps, due to distortion, are a bit more hit and miss with planar than dynamic headphones thou, so keep that in mind.

post #15269 of 18673
Quote:
Originally Posted by nicholars View Post
 

 

But earlier you said "just get a AV amplifier and use the headphone jack"....

 

Usually headphone jacks on AV amplifiers are a) very cheap / bad b) have output impedance 50ohm or worse....

 

Amps do amplify yes... That is about the only correct thing you have said so far


lol  this guy.  The headphone jackets on power amplifiers and receivers are very often directly connected to the loudspeaker outputs. To prevent damage to the headphones and to the amplifier, resistors are placed in between. These resistors generally have values between 200 and 600 Ohm but drop to 50 too.

Here's the thing if a headphone has flat impedance, then we should see no difference in frequency response with different amplifier output impedances. The source of this is basically what is called a voltage divider, where the voltage drop from the amp output to ground is split between the amplifer impedance and the headphone or speaker impedance. Assuming the amp exhibits flat impedance with frequency, if the headphone has different impedances at different frequencies the voltage will be split differenty at different frequencies. That will lead to a frequency response difference from what was encoded in the input signal. But, if there is no variation in headphone impedance at different frequencies, then the voltage split is constant and the amp output impedance has no effect on frequency response


it's ok though they feed you guys a lot of grass.  i only suggested keeping the output low because i was trying to avoid conflict from people that would argue with me but i suppose i should have just took the time to write this in the first place.

btw could you please tell me what you mean by this? "a) very cheap / bad" lol gosh i feel all warm and fuzzy inside right now

 

i generally try to meander around and act like i have a question and about this or that and then act like i stumbled across the answer and share with the readers.  I do this because it seams to help people cope with what i went through when i first started but then also avoid the herders that get on here just to keep the thieving cycle of "audiophile" going.

This stuff isn't nearly as hard as people make it out to be. 

post #15270 of 18673

So should we take it that you are planning to pick up an LCD2? :tongue_smile:

 

What I would like to know is if anyone has compared the HE-400 to the Sennheiser HD 700 - which is supposedly split between the warmer / forgiving HD 650 and the HD 800.

 

Then again I think the head-fiers here all more or less hated the 700 last time I checked.

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