This is not always the case. The headphones that I'm planning on using are Etymotic ER-4P's which are designed with a low impedance to remain efficient with portable music players but have very flat responses.
The dip in the top end is intentional as they are sealed into your ear and they need to put that in so that you don't feel like there is way too much in the high end. There is much less rolloff when something is sealed into your ear canal vs outside. I've made some plots of the ER4s along side the Grado SR60. The Grado is an often known standard for relatively inexpensive cans with good sound. The Grado's run around 60 to 80 bucks where as the ER4's are around 300 MSRP. But you can get them for at least half that. Response curve: http://graphs.headphone.com/graphCompare.php?graphType=0&graphID[]=733&graph ID[]=393 Impedance curve: http://graphs.headphone.com/graphCompare.php?graphType=7&graphID[]=733&graph ID[]=393 ~Brett -----Original Message----- From: Joe Subich, W4TV [mailto:[email protected]] Sent: Monday, June 22, 2009 9:36 AM To: 'Brett Howard'; 'Roy Morris' Cc: [email protected] Subject: RE: [Elecraft] K3 headphones Low impedance headsets are the ones with decreased low end response - or apparent excessive high frequency response and the resulting "tiring" sound. I strongly recommend 200 Ohm (Heil ProSet) or 600 Ohm (professional) headsets. 73, ... Joe, W4TV > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of Brett Howard > Sent: Monday, June 22, 2009 11:47 AM > To: Roy Morris > Cc: [email protected] > Subject: Re: [Elecraft] K3 headphones > > > Was it high or low impedance that was causing issues? I'm > contemplating plugging in two pairs of headphones which is > probably going to put me somewhere around 11 to 15 ohms > nominal. I'm sure it'll do fine but hadn't been able to find > much in the way of specs for the K3 in this regard. > > > On Mon, 2009-06-22 at 11:30 -0400, Roy Morris wrote: > > Gary, > > I use a 33 ohm headset with my K3. I have not noticed any > reduction of audio and the impedence match seems to be good. > I use an AKG K240 Studio headset and get excellent > reproduction. Roy Morris W4WFB > > ______________________________________________________________ > > 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 > > ______________________________________________________________ > 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 ______________________________________________________________ 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
