> The 8.2 ohms is actually in the K3. If I do it again for your 32 ohm > example I get 39Hz. With your 220uF cap that moves it down to ~18Hz for a > pair of 32ohm cans.
And that jumps to ~ 200 Hz if you use 8-ohm cans. If you stay cognizant of the headphone Z, you're in good shape. If you want to pull a set of Koss Pro4 AA phones off the shelf, you may want to revisit that. It's all about the series C and knowing the headphone Z as a function of frequency. It's doubtful your 27 ohms headphones remain 27 ohms across their frequency range. > Personally I think the more robust connection is a good point to keep and > I'm ok with the 45Hz output. I tried running things through my headphone Speaking of robust, when I started discussing the matter with Lyle many months ago, I was concerned that increasing the C value above 10 uF at C9/C13 would begin to introduce switching thumps that would become apparent especially in CW. Stated another way, I was hopeful that the small C size was not masking keying artifacts that were there all along, only to be discovered by increasing the cap size! But at 330 uF, I hear no artifacts as a result of the change. Pul, W9AC ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
