[Kenwood] Headphone impedance

[Robert Needleman]

Ken- I have the excellent Kenwood HS-5 headphones that work great with all my ham gear. The ear pads are rated at 8 ohms.
Bob K3AC

Sent from my iPhone

> On Mar 26, 2022, at 10:26 PM, ken.d.brown at hawaiiantel.net wrote:
> 
> Hi all,
> 
>    I have a new TS-590SG which I really like. I find the headphone volume, relative to the speaker volume, to be lacking. In other words when I put the cans on I always have to turn up the AF gain to get the audio level up to the same as had been coming out of the speaker. I'm using a Kenwood SP-43 speaker. I'm using some Koss QZ-99 headphones, but they don't have the original drivers in them. The original drivers failed and I put some in that claim to be 30 Ohm impedance. I see on the schematic that the headphone jack has 120 Ohm resistors in series with each of the hot (tip and ring) leads. So I presume that I would get the highest audio power delivered to the headphones if they were about 120 Ohms. I have tried to find specifications for Kenwood communications headset to no avail yet. I wonder if they are 120 Ohms? Can someone tell me what Kenwood's headphones impedance spec is? Or what kind of phones do you use with your TS-590 or other Kenwood HF rig?
> 
> Thanks,
> 
> Ken N6KB
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