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HiFiman HE-500 (HE as in High End) Proving to be an enjoyable experience in listening. . - Page 96

post #1426 of 18011

Good info! You can also use the tip of the TRS connector, touch multimeter probes to 1 and to 2 for one channel and to 1 and 3 for the other, as seen in this wikipedia picture. Cable resistance is really negligible.

 

 

I strongly recommend to measure HE-500 resistance and 

 

1. If you find imbalance more than 25% between the two channel drivers (which, normally, means more than 1dB power imbalance) ask for a replacement.

 

2. If balance is fine but you measure more than 30% resistance difference by the nominal value (of 38 Ohm) request for a replacement, also. I have audition a friend’s HE-500 which had almost half of mine’s resistance, and sound quality was really poorer than mine. Of course, if he hadn’t compared it with mine, he could not know the difference because his HE-500 sounded good enough (even compared to his Sennheiser HD-650).


Edited by plin - 6/17/12 at 7:40am
post #1427 of 18011
Quote:
Originally Posted by Ultrainferno View Post

Decided to measure my Hifimans today

 

HE-400 (35Ω): L: 28.1 & R: 33 - hmmm

HE-500 (38Ω): L: 39,3 & R: 38

 

Here's my results again.

post #1428 of 18011

Before taking the readings did you suspect the HE-400 drivers might be mismatched?  Or something you can live and deal with now that you know about it. 

 

Quote:
Originally Posted by Ultrainferno View Post

Here's my results again.

post #1429 of 18011

I have been lurking on this forum for years. I am a long time audiophile and I am finally motivated to make my first post. I bought a pair of HE 500 headphones from a local dealer (the dealer was in Bangkok). Took them home and was not prepared for the incredible sound these things produce. Yes, I read all the reviews, yes I auditioned them at the dealer but nothing prepared me for what I heard when I used them for a few hours at home. I have owned crazy expensive audio gear most of my life. Nothing surprised and pleased me as much as the incredible sound of these headphones. I have only  one complaint which I see little mention of in the reviews. The headband has minimal padding and the weight of these HE 500's cuts into my head. I have solved it for the moment by adding my own padding, but I am amazed that there are not more comments about this problem. I cannot be the only one bothered by this headband? 

 

Given the amazing sound, I will live with my headband problem until I can have a proper padded cover professionally made ( I can easily do this locally). This purchase forced me to run out and buy a better headphone amp as these headphones deserve better than the AKG I had sitting here. After thirty years of playing with high end audio gear this may be my best single purchase ever.

post #1430 of 18011
Quote:
Originally Posted by WNBC View Post

Before taking the readings did you suspect the HE-400 drivers might be mismatched?  Or something you can live and deal with now that you know about it. 

 

 

No I expected it, the left one sounded quieter and the overall sound wasn't as balanced. But I should redo the measurement cause I "fixed" the left driver

The HE-500 sounded correct and the measurements proved that


Edited by Ultrainferno - 6/17/12 at 7:53am
post #1431 of 18011
Quote:
Originally Posted by Chodi View Post

I have been lurking on this forum for years. I am a long time audiophile and I am finally motivated to make my first post. I bought a pair of HE 500 headphones from a local dealer (the dealer was in Bangkok). Took them home and was not prepared for the incredible sound these things produce. Yes, I read all the reviews, yes I auditioned them at the dealer but nothing prepared me for what I heard when I used them for a few hours at home. I have owned crazy expensive audio gear most of my life. Nothing surprised and pleased me as much as the incredible sound of these headphones. I have only  one complaint which I see little mention of in the reviews. The headband has minimal padding and the weight of these HE 500's cuts into my head. I have solved it for the moment by adding my own padding, but I am amazed that there are not more comments about this problem. I cannot be the only one bothered by this headband? 

 

Given the amazing sound, I will live with my headband problem until I can have a proper padded cover professionally made ( I can easily do this locally). This purchase forced me to run out and buy a better headphone amp as these headphones deserve better than the AKG I had sitting here. After thirty years of playing with high end audio gear this may be my best single purchase ever.

 

I had no issue with the original headband.  It's not too bad once you sort of mold it to your head.  The issue I had was that the tops of the cups were pressing my ears down (I have a short head apparently), so I needed the additional padding to raise the actual earcups.  Had plenty of long days wearing the he-500 all day long with the old headband.  The new one is much more comfortable though I do have to admit.

post #1432 of 18011

Thanks for the link Ultra. I have measured mine but with slight difficulties, maybe its because its a cheap multimeter, I first measured around 45 on both using 200 ohm setting. Then it was varying as I couldn't hold my hand steady so I attached the cable and measuring from the cable was much easier. Both driver measure 46.1 or 46.2 or 46.3. So its the best possible match and I have never noticed any channel imbalance just people were talking about it so much that I was curious.

post #1433 of 18011

I'm really curious now. I have a cheapo Radioshack multimeter, but I'll have to see about picking up a battery for it after work. It uses a 23A 12V battery rolleyes.gif, so hopefully some store around here has one.

post #1434 of 18011
Quote:
Originally Posted by .Sup View Post

Thanks for the link Ultra. I have measured mine but with slight difficulties, maybe its because its a cheap multimeter, I first measured around 45 on both using 200 ohm setting. Then it was varying as I couldn't hold my hand steady so I attached the cable and measuring from the cable was much easier. Both driver measure 46.1 or 46.2 or 46.3. So its the best possible match and I have never noticed any channel imbalance just people were talking about it so much that I was curious.

 

That's not near 38 but most importantly they're the same!

post #1435 of 18011
Quote:
Originally Posted by Ultrainferno View Post

 

That's not near 38 but most importantly they're the same!

What does it mean if its not close to nominal impedance Ultra? Could the sound be actually worse?

post #1436 of 18011

Would a Phoenix have enough juice to drive these well or am i better off using a v200? I have both but i'd like to use the phoenix since it's also used as a preamp. 

post #1437 of 18011
Quote:
Originally Posted by Subsequence View Post

Would a Phoenix have enough juice to drive these well or am i better off using a v200? I have both but i'd like to use the phoenix since it's also used as a preamp. 

of course

post #1438 of 18011
Quote:
Originally Posted by .Sup View Post

of course

Thanks wasn't entirely sure since it seems to lack some juice for the HE-6.

post #1439 of 18011
Quote:
Originally Posted by Subsequence View Post

Thanks wasn't entirely sure since it seems to lack some juice for the HE-6.

HE-works really well from the ipod actually :P It needs a bit more power than HD800

post #1440 of 18011
Quote:
Originally Posted by .Sup View Post

Both driver measure 46.1 or 46.2 or 46.3. So its the best possible match and I have never noticed any channel imbalance just people were talking about it so much that I was curious.

 

 

 

Quote:
Originally Posted by .Sup View Post

What does it mean if its not close to nominal impedance Ultra? Could the sound be actually worse?

 

 

 

I do not want to cause any unecessary alarm to anyone, my HE-500's impedance is, also, different from the nominal impedance (it is around 48 Ohms), but big deviations from nominal impedance is not a good sign

 

I can only repeat stating my small experience that I have already done a few posts before:

I have audition a friend’s HE-500 which had almost half of mine’s resistance, and sound quality was really poorer than mine. Of course, if he hadn’t compared it with mine, he could not know the difference because his HE-500 sounded good enough (even compared to his Sennheiser HD-650).

 

It would be very interesting if anyone can compare the SQ of various HE-500s with different impedances . I suspect it would be quite revealing for all of us. 

 

I suspect (but I have not any direct knowledge about) that there are various manufacturing reasons behind the relative big resistance variations.

First of all, we have to note that the impedance in orthos is almost purely resistive. So any variation in the manufacturing process of the metal (aluminum, for HE-500, I believe) deposited (??) on the membrane is directly effecting the resistance. Different metal impurities, thickness, or even layout, directly effect drivers impedance. All these are effecting also SQ. Metal impurities effect the elasticity of metal, thickness (apart from elasticity) effect also total moving mass, etc. In any case, big differences in impedance do effect headphones efficiency. 

 

If anyone has compared two or more HE-500s with big impedance differences, please share your experience with us.

 

When comparing HE-500 with different impedance values, please keep in mind that they will probably have also different efficiencies, so you have to level - match them. Maybe you can level - match them using the following formula:

dB difference = 10*log(R1/R2)

where R1 and R2 is the mean value (of the two channels) for each HE-500's impedance. In .Sup's HE-500, R is 46.2. 


Edited by plin - 6/17/12 at 12:23pm
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