Re: K3 DSP AGC Question
Posted by
Grant Youngman on
Feb 08, 2010; 10:39pm
URL: http://elecraft.85.s1.nabble.com/K3-in-a-cw-pileup-needs-work-tp4523884p4537645.html
>>
>> I was very disappointed to read your post. I purchased a Proset headset
>> directly from Elecraft when I bought my K3. According to Heil this headset
>> has an impedance of 200 ohms. Is that why I have to plug my headphones
>> into the rear speaker jack to get sufficient audio output from them? Why
>> would you folks sell a headset that does not complement the K3? I am
>> really disappointed.
There are two factors here. One is impedance. (The impedance actually presented by a headphone is frequency dependent and can vary widely from the "nominal" value). The other is sensitivity.
I regularly use 250 ohm headphones on the K3 with no issues whatsoever. Why? They require very little drive to reach an acceptable output level. So even given their relatively high Z (compared to 32 ohms) it isn't necessary to drive the output stage of the K3 into clipping or high distortion levels to get plenty of good audio.
I have a set of high end audiophile headphones with 62 ohm Z. I don't use them on the K3 (tried them once). Why? It takes a whole lot of power (relatively) to drive them to reasonable listening levels.
Given the number of people who use Prosets and seem to like them just fine, I don't know why there would be any real concern or any reason to feel disappointment.
Grant/NQ5T
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