From what I understand, there is no way to increase earphone resistance by use of resistors in serial. Instead you increase the amps output impedance.

Suppose you have two different Headphones connected to a single amp by a Y-adaptor.

HP1 = Load of 400 ohms

HP2 - Load of 25 ohms

Suppose the Output impedance of the amp (Z) = 2 ohms

What is Z?

What is Load 1?

What is Load 2?

Do loads 1 + 2 sum together to equal the resistance seen by the amp? Does each individual Load remain the same?

*Is it possible to "add resistance" to one headphone by adding a second headphone load via a Y-adaptor? Or are you just increasing the amps output impedance?*

If you don't know what I am talking about, there are two articles will really help you understand things all good audiophiles should know : )

Google: "Headphone Impedance Explained" and see the "output impedance" link within that article. (Unallowed to link to that site directly.)

Thanks for any insight

Edited by SoundFreaq - 5/18/13 at 10:57am