ISO Regen performance Improvement Cheap!

[Summit]

21 hours ago, sandyk said:

 

Don't forget that for the most balanced sound the HD800 should be driven from a source impedance of 120 ohms .

 

Why??

[Summit]

23 hours ago, sandyk said:

 

Because they were DESIGNED to meet an old IEC specification that says they should be driven from a 120 ohms source impedance. It's no coincidence that the graph shows this gives the flattest frequency response in the critical midrange area !

 Other headphones such as the AKG K701 etc. , AT W1000 etc. also met this specification.

 

I think you have misunderstood the graph. 0 Ohm is the flattest frequency response and the higher the amp output impedance the more mid-bass boost you get. Maybe the mid-bass boost sounds better to you, but that’s another story....

 

 “Again, look at the impedance plot of the HD800. With a high output impedance amp, the headphones will get a little more gain as the impedance goes up. Therefore, you can think of the impedance curve as an EQ curve with high impedance amplifiers. The higher the amp output impedance, the more the headphones will be EQ'd toward the shape of the impedance curve. In the case of the HD800, the higher the output impedance of the amp, the more you'll get a mid-bass boost centered at 100Hz.”

 

Please provide some reference for that The HD800 was designed to be driven with an impedance of 120 ohms.

 

https://www.innerfidelity.com/content/musings-headphone-amplifier-output-impedance#0IWArLxxoRVOlOfO.99