[3602]

It says this everywhere. Chinese forums. Head-Fi. Blogs.
I don't get it: higher impedance is easier to drive, but better sound quality?

 

[MrGreen]

The 600ohm drivers have lower mass, which in theory results in better transients.

Not sure what to make of the rest of it.

 

[sarathcpt]

Lower noise floor and easier to drive in terms of current it draws, I guess.

 

[stang]

AFAIK, the higher the impedience, the harder it is to drive, although most of that depends on how sensitive the headphones are in the first place, but the more detailed they will be with more impedience.

 

[MrGreen]

Quote:

Originally Posted by stang /img/forum/go_quote.gif AFAIK, the higher the impedience, the harder it is to drive, although most of that depends on how sensitive the headphones are in the first place, but the more detailed they will be with more impedience.

Nope.

 

[Shike]

It's probably increased to potentially improve the damping factor. Of course the importance of it when it relates to headphones is still debated.

Green, do you have a source on the differences in mass?

 

[Helmore]

Quote:

Originally Posted by stang /img/forum/go_quote.gif AFAIK, the higher the impedience, the harder it is to drive, although most of that depends on how sensitive the headphones are in the first place, but the more detailed they will be with more impedience.

Simply having a higher impedance does not equate more details. In this case the higher impedance is a result of using finer wire to wind the voice coil and the finer wire simply has a higher resistance because it's narrower. This will result in a lighter voice coil which can result in better detail.

 

[MrGreen]

Quote:

Originally Posted by Shike /img/forum/go_quote.gif It's probably increased to potentially improve the damping factor. Of course the importance of it when it relates to headphones is still debated. Green, do you have a source on the differences in mass?

Not currently, but I read it on head-fi (in a quote of an email from beyerdynamic).

If I recall correctly it might have been an email sent to leeperry. As I remember the mass is 32ohm > 250 ohm > 600 ohm. They have different part numbers, so you should be able to investigate fairly easily (or even email them yourself).

I think the reasoning behind it was that the 600 ohm needs less current and therefore can use a thinner guage wire.

A simple search should reveal it on head-fi though (on the train, sorry).

 

[Shike]

Quote:

Originally Posted by MrGreen /img/forum/go_quote.gif Not currently, but I read it on head-fi (in a quote of an email from beyerdynamic). If I recall correctly it might have been an email sent to leeperry. As I remember the mass is 32ohm > 250 ohm > 600 ohm. They have different part numbers, so you should be able to investigate fairly easily (or even email them yourself). I think the reasoning behind it was that the 600 ohm needs less current and therefore can use a thinner guage wire. A simple search should reveal it on head-fi though (on the train, sorry).

Thanks, I'll make sure to look it up later. I really wonder how much mass they cut off and if it's really worth it myself, but it's interesting nonetheless.

 

[MrGreen]

Quote:

Originally Posted by Shike /img/forum/go_quote.gif Thanks, I'll make sure to look it up later. I really wonder how much mass they cut off and if it's really worth it myself, but it's interesting nonetheless.

I am highly skeptical of the whole 600 ohm thing myself, to be honest.

 

[sarathcpt]

Quote:

Originally Posted by MrGreen /img/forum/go_quote.gif Not currently, but I read it on head-fi (in a quote of an email from beyerdynamic). If I recall correctly it might have been an email sent to leeperry. As I remember the mass is 32ohm > 250 ohm > 600 ohm. They have different part numbers, so you should be able to investigate fairly easily (or even email them yourself). I think the reasoning behind it was that the 600 ohm needs less current and therefore can use a thinner guage wire. A simple search should reveal it on head-fi though (on the train, sorry).

Isn't it the other way around ? Thinner guage wire in the coil leads to higher impedance going by R = rho*L/A (where A is the area of cross.sec) and since it presents a high impedance at the circuit output it takes less current.

 

[Helmore]

Quote:

Originally Posted by MrGreen /img/forum/go_quote.gif I am highly skeptical of the whole 600 ohm thing myself, to be honest.

Then email Beyerdynamic and ask them if there is a difference in the wire thickness that's used to wound the voice coil. There are quite a lot of people reporting that the wire on the higher impedance drivers is visibly thinner.

@sarathcpt: Yes that's how it works. The higher impedance is a result of the thinner wire. They didn't choose a thinner wire because there would be a lower amount of current running through it.

 

[MrGreen]

Quote:

Originally Posted by Helmore /img/forum/go_quote.gif Then email Beyerdynamic and ask them if there is a difference in the wire thickness that's used to wound the voice coil. There are quite a lot of people reporting that the wire on the higher impedance drivers is visibly thinner.

It's not the driver mass I am skeptical about. I'm not really prepared to order a 600 ohm beyer to test the sound anyway.

Quote:

Originally Posted by sarathcpt /img/forum/go_quote.gif Isn't it the other way around ? Thinner guage wire in the coil leads to higher impedance going by R = rho*L/A (where A is the area of cross.sec) and since it presents a high impedance at the circuit output it takes less current.

Probably. Not too knowledgable about wires to be honest (hence the 'I think').

 

[Headdie]

Quote:

Originally Posted by MrGreen /img/forum/go_quote.gif I am highly skeptical of the whole 600 ohm thing myself, to be honest.

So do I ! I'd be curious to know if the PRO version comes also at 600 ohms. If not, it's probably an audiophile gimmick. Note that I have a vintage DT990-600 and and new DT990-250. I hear more difference from the cushions than from the drivers...

 

[jacdan]

Never tried the 770-600s but the main difference between my 80s and 250s were that the 80s were prone to distortion when playing back deep bass on my main rig. The 250s handle the bass just fine.