[khara]

I have a the 598s, and the Xonar DX. Recently I read that the output impedance of the source should be 1/8th of the headphone's impedance. So, the 598's impedance is 50 ohms, and the output impedance of the xonar is apparently ~100 ohms.
 
I've been thinking of getting a cMoy BB and hooking it up to the xonar, and obviously hookup the headphones to the cMoy. I realize that I should put a note on the order saying that the cMoy will be used with low impedance headphones. Do I still need to worry about the output impedance of the sound card relative to the input of the cMoy?
 
Sorry if this is in the wrong section, I can't tell if it should be here, or in the amplifiers section.

 

[stv014]

Quote:

Originally Posted by khara /img/forum/go_quote.gif
 
Do I still need to worry about the output impedance of the sound card relative to the input of the cMoy?

No, the input impedance of the CMOY is likely to be at least a few kΩ, and not vary significantly with the frequency. For a line output, 100 Ω output impedance is normal and not uncommon.