or Connect
Head-Fi.org › Forums › Equipment Forums › Headphones (full-size) › **Hifiman HE-400 Impressions and Discussion Thread**
New Posts  All Forums:Forum Nav:

**Hifiman HE-400 Impressions and Discussion Thread** - Page 1010

post #15136 of 21577
Quote:
Originally Posted by MattTCG View Post
 

Anyone know someone doing a mod to convert the cup connectors to mini xlr?


BTG audio

post #15137 of 21577
Thread Starter 
Quote:
Originally Posted by BeBop Lives View Post
 


BTG audio

 

I thought he might. Already sent him an email. Anyone here had this done?

post #15138 of 21577
Quote:
Originally Posted by Soundsgoodtome View Post

Sometimes I wonder on this diminishing returns as well. Then I look at the equipment and say...well maybe my built-in amp isn't providing enough juice, even at 900MW @32ohm. This is after all a planar magnetic. I'm quite certain the the D100s DAC is more than capable of reaching the HE400 on its sound potential but doubting on the amp. So.... I upgrade.


I will have in my possession very soon a balanced cable and about 4000MW of power through an Audio-GD NFB10-SE. There will be no doubt now if I am underpowering these planar magnetics... so we shall see. Head-fi is an expensive place to roam around.

The HE-400 only needs 720mW to get to 120dB. You aren't under-powering them.
post #15139 of 21577
Quote:
Originally Posted by Thujone View Post

The HE-400 only needs 720mW to get to 120dB. You aren't under-powering them.
Actually it's 10w at 25ohm, which will come handy for a future he4 or he6.



The reason I think they may be underpowered is they're not able to reach volume levels of my other phones. Although said volume levels would be above safe listening levels. Is it just the nature of planar magnetic? The sound is thick and luscious as if it is properly amped. I do notice that the leakage gets louder when putting the phoNes down and walking away from it.
Edited by Soundsgoodtome - 12/12/13 at 10:58am
post #15140 of 21577

You could get a decibel meter to check. I find that it's easy to turn up the HE-400 pretty loud without really realizing, since the sound is so effortless. 

I use a speaker amp for the HE-400, but because I'm using 250 ohm resistors on the outputs I only get about 180 mw. Seems like plenty, but I'm going to be buying resistors with a value that gives me 1 W even sometime in the near future and see if that makes any difference. 

post #15141 of 21577
Quote:
Originally Posted by Soundsgoodtome View Post

Actually it's 10w at 25ohm, which will come handy for a future he4 or he6.


The reason I think they may be underpowered is they're not able to reach volume levels of my other phones. Although said volume levels would be above safe listening levels. Is it just the nature of planar magnetic? The sound is thick and luscious as if it is properly amped. I do notice that the leakage gets louder when putting the phoNes down and walking away from it.

All I meant was that your original amp was probably sufficient for the HE-400. Glad to hear you got the HE-4 though! Your new amp should do wonders with those puppies.

I think planars just require a lot more power to get to those obscene listening levels. For example, the HE-6 takes 632mW to get to 105dB but it takes 20,000mW (20W) to get to 120dB.
post #15142 of 21577
EDIT: Double post
post #15143 of 21577
Can someone recap what would be good amps (or dac/amp combo) for various price range?

$200
$300
$400
$500
$750
$1000

Thanks!
post #15144 of 21577
Quote:
Originally Posted by Thujone View Post


All I meant was that your original amp was probably sufficient for the HE-400. Glad to hear you got the HE-4 though! Your new amp should do wonders with those puppies.

I think planars just require a lot more power to get to those obscene listening levels. For example, the HE-6 takes 632mW to get to 105dB but it takes 20,000mW (20W) to get to 120dB.


So the behavior of power to decibel level on planar magentics are different. I was wondering this because if I listened to my SRH1440 on the same position on the same amp and even taking into consideration the efficiency...I'd blow my ears off my head. Definitely excited for the HE4s!

The AudioGD just arrived too.

post #15145 of 21577
Quote:
Originally Posted by nabwong View Post

Can someone recap what would be good amps (or dac/amp combo) for various price range?

$200
$300
$400
$500
$750
$1000

Thanks!


This is a great idea and your post should be updated with suggestions. I can say that the Yulong D100 is a great pairing with the HE400s. Enough power and the DAC is probably the best in my arsenal. They can be had used in the mid to high $200 area, but are $400 new.

post #15146 of 21577

just get a surround receiver and use the internal dac and headphone amplifier. my marantz powers them just fine.  then you also get the ability to have surround sound for your house.

post #15147 of 21577
Quote:
Originally Posted by Soundsgoodtome View Post
 


So the behavior of power to decibel level on planar magentics are different. I was wondering this because if I listened to my SRH1440 on the same position on the same amp and even taking into consideration the efficiency...I'd blow my ears off my head. Definitely excited for the HE4s!

The AudioGD just arrived too.

What?

 

The reason that planars need so much more power is because of their inefficiency relative to many dynamics - the "behavior" is still the same in terms of reaching a given loudness.

 

If a planar were rated at 90 dB/1mW it would need about 7-8 mWs to hit 100 dB - or several times the power required of a dynamic that happened to be rated at 100 dB/1mW. For each headphone to reach 120 dB, the less efficient would need about 1,000 mWs, while the more efficient can would require only about 120 mWs.

 

I think you are confusing the scale of power needed with what are actually big differences in rated efficiency. A 10 dB spread between speakers is significant.

post #15148 of 21577
Quote:
Originally Posted by MrMateoHead View Post
 

What?

 

The reason that planars need so much more power is because of their inefficiency relative to many dynamics - the "behavior" is still the same in terms of reaching a given loudness.

 

If a planar were rated at 90 dB/1mW it would need about 7-8 mWs to hit 100 dB - or several times the power required of a dynamic that happened to be rated at 100 dB/1mW. For each headphone to reach 120 dB, the less efficient would need about 1,000 mWs, while the more efficient can would require only about 120 mWs.

 

I think you are confusing the scale of power needed with what are actually big differences in rated efficiency. A 10 dB spread between speakers is significant.

 
Right. It's all based on the efficiency rating of the headphone. But, all planars have lower efficiency (on average) than dynamics. This make them require slightly more power for normal listening levels, but the difference gets greater as you go up in volume. (i.e. a headphone twice as efficient as the HE-6 would require 316mW at 105dB and 10W at 120dB. Only a 316mW difference at 105dB and a 10W difference at 120dB.) I should have stated my post differently. The way I put it makes it sound like planars are exponentially harder to drive and that is untrue.

Edited by Thujone - 12/13/13 at 1:22am
post #15149 of 21577

I'm gonna do some reading because now I'm confused. :confused: 

I'm looking at Beyerdynamic's website and they got their nominal sound pressure level at 96db/1mw (edit: for the DT880). But... the specs are the same for all 3 variants at 32, 250, and 600ohms. Is that a mistake? You would think that at 1MW, the 600ohm would be considerably less than the 32 as far as volume. Or am I going about this the wrong way? Does ohms not effect the efficiency? Sorry for the newbie-ness

 

post #15150 of 21577

mW is power.  power is voltage x current. 

 

Ohm's law dictates that the higher the impedance the less current and more voltage an amplifier needs to reach a certain level of power, which in this case is mw.  High impedance beyers aren't more difficult to drive, they're just different to drive.


Edited by TMRaven - 12/12/13 at 6:24pm
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: Headphones (full-size)
Head-Fi.org › Forums › Equipment Forums › Headphones (full-size) › **Hifiman HE-400 Impressions and Discussion Thread**