[Elecraft] K2 Headphone Suggestion

Mon Jan 20 17:18:01 2003

Mike brings up the important spec to look for in the headphone
discussion, the dB SPL (Sound Pressure Level) for 1 mW input - apart
from the question of comfort for hours of wearing of course.

I had a pair of Yamaha headphones, HP-2, with sensivity 93 dB/mW SPL,
they were so insensitive that I had to parallel the output resistors
with 22 ohms to get enough output. Then I replaced them with the
headphones with the largest value for sensitivity that I could find,
Aiwa HP-CN5 noise canceling headphones with a sensitivity of 106 dB/mW
(Of course being a tech freak, I just had to have the noise canceling!).

Now I have removed the headphone output mod in my K2 and often I use the
attenuator that came with the headphones to get a comfortable level. But
then 13 dB is a lot - 2 S units if that can be used for audio signals(?)
I was not aware of the super sensitive Sennheiser 457 with 114 dB/mW
SPL, for them the 8-9 o'clock position for the AF control should be more
than enough!

73
Sverre
LA3ZA

> -----Original Message-----
> From: [email protected] 
> [mailto:[email protected]] On Behalf Of Mike Lewis
> Sent: 20. januar 2003 17:22

> the 457s put out 8db more SPL (measured at 1kHz) than the 
> 495s do (114 vs. 106). 