[Elecraft] K3 - Splitting main/sub audio to 2 headphones

[Joe Subich, W4TV]

On 2014-06-01 2:39 PM, Jim Brown wrote:
>> Paralleling headphones of with differing impedance and sensitivity
>> will result in one operator getting too much or too little audio
>> and may require gain high enough to result in excess distortion or
>> dissipation.
 >
> That may be true, and is the only negative for paralleling them. But
> it also depends on the voltage sensitivity of the headphones
> involved.

As I implied in my statement - one can have differing sensitivities
even with headphones of he same nominal impedance and even differing
sensitivity between older and newer units of the same manufacturer
and model.  That's why the safest course of action is to always use
an amplified splitter with individual gain controls.

73,

    ... Joe, W4TV


On 2014-06-01 2:39 PM, Jim Brown wrote:
> On 6/1/2014 11:29 AM, Joe Subich, W4TV wrote:
>> You can't guarantee that with any two random headphones - my shack has
>> headphones anywhere from 8 Ohms to 200 Ohms.
>
> I would change that. Simple Ohms Law suggests that's a very bad idea,
> for reasons noted in the next sentence.
>
>> Paralleling headphones
>> of with differing impedance and sensitivity will result in one operator
>> getting too much or too little audio and may require gain high enough
>> to result in excess distortion or dissipation.
>
> That may be true, and is the only negative for paralleling them. But it
> also depends on the voltage sensitivity of the headphones involved.
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