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

post #15256 of 19961
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 #15257 of 19961

---mispost---

post #15258 of 19961
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 #15259 of 19961
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 #15260 of 19961

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 #15261 of 19961

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 #15262 of 19961
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 #15263 of 19961

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.

post #15264 of 19961

I just got a pair of HE-400s and I've been using them with my Xonar STX sound card. I'm finding that the volume is a little subdued, so I'm guessing I'll need an AMP.  Does anyone have any recommendations for an AMP in the 100 dollar range? I'm thinking EO9K?

 

 

home setup

HE-400

Xonar STX

 

work setup

B&W P7

mod+vali

post #15265 of 19961

I didn't really compare the two in-depth, but I had both side by side at one point in a quiet store room.  The HD700 is truly weird sounding.  It seemingly has a lone peak around 5-6khz, and it creates a really cold and unnatural sound.  I don't like it, at all.  For comparison I'd recommend the HD800 over them, and I don't like the HD800 at all either.  Keep in mind I also had near the entire lineup of Grados there as well, and the HD700 peak stood out even compared to a lot of the Grados.  Now that's saying something.

post #15266 of 19961

I supposed the most important factor to consider when amping planars is power output. Most are rated as low-impedance phones (~30 ohms), but the HE-400s tested at more like 50 Ohms. That is nearly twice the resistance. Most are also relatively inefficient compared to many dynamics, so finding amps in the 500 - 1,000 mW range is probably a good idea!

post #15267 of 19961
Quote:
Originally Posted by TMRaven View Post
 

I didn't really compare the two in-depth, but I had both side by side at one point in a quiet store room.  The HD700 is truly weird sounding.  It seemingly has a lone peak around 5-6khz, and it creates a really cold and unnatural sound.  I don't like it, at all.  For comparison I'd recommend the HD800 over them, and I don't like the HD800 at all either.  Keep in mind I also had near the entire lineup of Grados there as well, and the HD700 peak stood out even compared to a lot of the Grados.  Now that's saying something.


Disappointing to hear. I really would like to get into a high-end sennhieser down the road, and probably whatever model comes along to replace the HE-400! I suppose that leaves me with the HD 600 (too old at this point IMO) or the HD 598 (too similar to the 595?).

post #15268 of 19961

Well luckily enough the 598 is very cheap right now, so it's not a risky purchase.  Even though the 598 is still too cold for my tastes it's still infinitely more smooth overall in frequency response compared to the HD700 or HD800.

 

I wonder how an anax modded HD800 would sound like, I'm assuming I would like it very much.

post #15269 of 19961
Quote:
Originally Posted by TMRaven View Post
 

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.


What does a loss of driver control sound like if there is no change in frequency response? I don't see how these two ideas are compatible. 

 

post #15270 of 19961
Quote:
Originally Posted by MrMateoHead View Post
 

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

Definitely not any time soon, I was just answering his question. HFM for life!

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