[Elecraft] [KX3] Headphones for KX2/KX3 for Single sided deafness

[Bob Nielsen]

As another ham who is deaf in one ear (although I was in my 50s when it 
happened), I was wondering if I am out of luck when it comes to the dual 
watch function of the KX2.

Bob, N7XY

On 7/26/16 3:50 PM, Don Wilhelm donwilh at embarqmail.com [KX3] wrote:
>
> Joe,
>
> I suggest that you are looking at the wrong parameter. Audio folks have
> not done "impedance matching" for a long time now.
> You should be looking at the SPL ratings for the headphone instead -
> that is an indicator of the sensitivity.
>
> The audio amplifier output is a low impedance and will feed as much
> power into the connected device (speaker or headphones) as it can take.
> Consider a parallel - plugging a lamp into an AC mains receptacle.
> The AC Mains receptacle is a low impedance source. If you plug in a 25
> watt bulb, it will produce the light of a 25 watt bulb, but if you plug
> in a 100 watt bulb, it will produce more light - same low impedance
> driving source.
>
> Just guessing here ---
> Is it possible that your single headphone has a mono plug on it? If so,
> it is shorting out one channel of the KX2 audio. Change it to a stereo
> plug with the tip and ring connected together. (caution, wires in
> headphones can be difficult to solder, some are nylon fiber wrapped
> loosely with copper braid for flexibility).
>
> Alternately, just use a regular set of headphones - yes, you will not
> hear one side, but the audio should be better.
>
> 73,
> Don W3FPR
>
> On 7/26/2016 5:15 PM, kn2a2016 at icloud.com [KX3] wrote:
> >
> > Hi all.
> > I have SSD. Born deaf from my left ear.
> > Can anyone recommend an affordable headphone that I can use with the
> > KX2? I recently purchased a Stanton DJ Pro 300 headphone ( it only has
> > one side). It seems that there is a impedance mismatch because I can't
> > get a loud output when I use it. It works fine when connected to my
> > iPhone or laptop.
> > Any suggestions? I can probably cook up a impedance matching circuit
> > or just buy a "normal " headphone and call it a day however I like the
> > single headset concept.
> > Any ideas or suggestions are appreciated.
> > Thanks
> > Joe KN2A
> >
> >
>
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> ------------------------------------------------------------------------
> Posted by: Don Wilhelm <donwilh at embarqmail.com>.
>
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