[Elecraft] K3 headphones

[Brett Howard]

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:lists at subich.com] 
Sent: Monday, June 22, 2009 9:36 AM
To: 'Brett Howard'; 'Roy Morris'
Cc: elecraft at mailman.qth.net
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: elecraft-bounces at mailman.qth.net 
> [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Brett Howard
> Sent: Monday, June 22, 2009 11:47 AM
> To: Roy Morris
> Cc: elecraft at mailman.qth.net
> 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
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