Jim,
Maybe you could expand on that somewhat as I'm still confused a bit.
Perhaps I'm not understanding what I hear, or why, but it almost always
seems that when speakers (or headphones) are not closely matched to the
designed impedance I notice some deterioration in output. Some mismatch
doesn't seem too serious, but when the difference is high, it seems much
more noticeable.
On the other hand, I've also experienced that using headphones with higher
sensitivity ratings (like most Sony ear buds) tends to provide much higher
output. Most ear buds tend to be 32 ohm (16 at lest), but I find Sony ear
buds usually work best as many of them have sensitivity ratings up
around -108 dbm. I could very well be fooling myself!
This topic was covered somewhat similarly back when folks, including me,
were complaining about poor audio output from Heil headphones. The
headphone portion of my Yamaha CM500 works a lot better than my Heil, but
neither works as well as some ear buds. I don't really have another good
pair of headphones around here to try.
Also, it was interesting to see Eric's response to this question. He
indicates that the rigs are spec'd at 4 ohms, and that 8 ohm speakers would
diminish output somewhat.
Anyway, maybe you could make this all a bit clearer.
Thanks,
Dave W7AQK
From: Jim Brown <j...@audiosystemsgroup.com>
On Mon,1/23/2017 9:22 AM, Walter Underwood wrote:
For portable operation, I use Apple EarPods. Those are 45 Ohms.
Don't worry about impedance of headphones. There is no need to match
impedances in audio circuits.
73, Jim K9YC
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