[Elecraft] K3 - 'High Isolation Headphones'

[Philippe Trottet]

Dears,
I'm using a SONY MDR 7505 since 2003 with various rigs. 
Not a noise cancelling headphone but great comfort, with a very clear
audio on cw, ssb & am/fm.
Power (mW):1000 
Impedance: 24 Ω 
Frequency response: 10Hz - 25Khz 
Sensibility (dB / W / m): 106 
Weight: 220g without cable
73's
Philippe A65BI  (F5LTB)
K3#3616

>>> Barry N1EU <barry.n1eu at gmail.com> 03-03-2010 2:02 >>>


AD4C2009 wrote:
> 
> Well I spent this past weekend 18 hours in radio on saturday and
sunday
> with my Yamaha CM-500 on my head all the time,either on CW or SSB and
felt
> no tired,they are smooth and weight little in my head,isolation is
> perfect.
> 

I just wanted to post a follow-up message on this thread.  I just
acquired a
CM500 headset - they seem to perform quite well but they can hardly be
considered a high isolation headphone.  The isolation is about the same
as
the Heil ProSet but falls far short of the Sennheiser HD280.  The
CM500
isn't really suitable if you follow the K3NA approach toward
maximizing
dynamic range with AGC off.  On the other hand, the CM500 seems quite
good
indeed for normal operation with AGC on and the microphone gets great
audio
reports.

73, Barry N1EU

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