starman wrote:

I have two pairs of RS Pro-25's. I bought them for $19.95 each when they
went on sale every year. They have very good sound with low distortion.
They were made for RS by Koss.

Getting back to the topic, I still don't recommend full range (fidelity)
headphones for shortwave listening. They exaggerate the high frequency
heterodynes, if they can't be removed with a notch filter or bandpass
filtering on the receiver. You may not always be aware of those het'
tones but they can lead to listener fatique.
Some of the best shortwave headphones are the old ones with full ear
cups that use small cheap speakers. You can find them at garage sales
and flea markets. They have the kind of speakers found inside of
computer cases which make the 'beap' when you turn the computer on.

That's why I've always liked my 'el cheapo RS (Archer) 16 ohm phones.

Good voice quality.