Beyer amps with 100 ohm output impedance. Lolwhut? - Page 4

I "built" my answers into your question:

Quote:

Originally Posted by khaine1711 

Hmmm, I'm not sure how to word the second question. What I really wanted to ask is

 

Are there any differences between an amp with 100 ohm output impedance, the same amp with 0 ohm output impedance with a 100 ohm imp adapter?

 

No sir!

 

An example would be:

- If beyer decides to build another version of their A1, but with 0 ohm output impedance; would that amp + the 100 ohm adapter be the same as the current A1 with 100 ohm output impedance? (provided that all circuits are the same, the only difference is the output impedance)

 

Yes sir!

Is that an A1 MK II or is that the A2?   LOL!

Stay cool

 

Quote:

Originally Posted by Donald North 

Yes, the amplifier would see a 700 ohm load. The added series resistor forms a voltage divider with the impedance of the headphones and reduces the voltage and power delivered to the headphone.

 

I don't understand your second question - please clarify.

 

You'll have to ask beyer about your third question. As mentioned previously in this thread, there is an international standard IEC 61938 which specifies 120 ohm amplifier output impedance for driving headphones.
 

 

 

I don't see the point of the IEC standard.

 Just turn the volume up and down as needed. That's what it's for. LOL!

Maybe Beyer has a better answer than me.

'Cos I certainly don't want a 120 ohm impedance driving my AKG Q701s or my future Grados!
 

Thanks .

Hopefully I will like Beyer's "intended" sound signature; cuz currently I'm seriously in love with my dt990 driven out of 0 ohm output impedance lol.

Also why 100 ohm adapter and not 120 ohm adapter?

Does the 20 ohm difference lies in the cable or something? Or is there no 120 ohm resistor?

Quote:

Originally Posted by Chris J 

I "built" my answers into your question:

I don't see the point of the IEC standard.

 Just turn the volume up and down as needed. That's what it's for. LOL!

Maybe Beyer has a better answer than me.

'Cos I certainly don't want a 120 ohm impedance driving my AKG Q701s or my future Grados!
 

 

Quote:

Originally Posted by khaine1711 

Thanks .

Hopefully I will like Beyer's "intended" sound signature; cuz currently I'm seriously in love with my dt990 driven out of 0 ohm output impedance lol.

 

Also why 100 ohm adapter and not 120 ohm adapter?

Does the 20 ohm difference lies in the cable or something? Or is there no 120 ohm resistor?

 

Why 100 ohms?

Not 120?  I guess that question is aimed at the the adaptor manufacturers.

Relative to 600 ohms, 100 or 120 ohms makes very little difference.

They do make 120 ohm resistors.

The cable has virtually zero resistance.

I have an old power amp with a 150 ohm headphone jack, I've tried plugging in my AKG Q701s, let's just say I wasn't too impressed with the bloomy bass.

I also tried some 2,000 ohm Sennheisers, they sounded really punchy and dynamic (compared to other amps). They aren't the world's greatest 'phones!
 

hhm.... Headzone not justifying the cost? It's your job to find a Realizer now :p

There is an article on Stereophile which completely discredits the IEC 120 ohm headphone amp output impedance standard as a ridiculous sham.

Quote:

Originally Posted by Chris J 

 

There is an article on Stereophile which completely discredits the IEC 120 ohm headphone amp output impedance standard as a ridiculous sham.

Bottom of page three, for those wondering.

http://www.stereophile.com/features/808head/index.html

Not entirely sure what my opinion is worth since most of this thread is beyond my knowledge and experience but, I skimmed through it since I was interested in what the outcome was.

I started looking for a headphone amp a while ago and perhaps I got a little carried away but I ended up with a Beyer A1. At the time it was probably more subconscious but now I fully intend to get a set of T1s to go with it.

I wont go into why I got the amp because that's a whole other story I got the amp to go with my MMX 300 headset. Initially the MMX 300 was only plugged into my Titanium HD soundcard but since I got the amp I've been using only that. Recently I've had a pair of the original Beyer DT990s donated to me and after a little reading I found these only come in 600ohm flavours so I was interested to see what they would sound like.

Overall they don't sound that dissimilar aside from the obvious differences between open and closed cans. I'm not sure how it does it but it manages to sound pretty awesome to my ears with either headphones. At some point in the future I'll get the T1s and I'll have those to compare with but I'm still pretty content at the moment :)