The ebay link you provide is for a pair of Pro 4AAs (read the tile of the sale thread). I had assumed, despite the change in colour, they were genuine NOS stock.

Yet there does seem to be some evidence of a 'new' value-engineered version of the Pro 4AA headphones: (taken from the Audio Review site)

This review is for the "NEW" version of the Pro-4AA's that has been re-designed and is different from the "OLDER" version. First of all DO NOT waste your money on this new version of the Pro-4AA especially if you had the older version. They are made like Garbage!! Cheap plastic and cheap materials is what makes up this new version. I removed one of the ear pads,and there were 2 staples holding down the mesh pads to a piece of cheap felt!! I couldn't believe it!! The adjustable headband is made so poorly,it's a struggle just to adjust the size. And of course most importantly; The Sound. At 250-Ohms impedance they are difficult to drive, even with a Headphone Amp. I am a headphone enthusiast and use a well known high-end Headphone Amp; and they sound like total crap!! The old version was WAY better than these, all around. If you want to spend $100 get a pair of Sony MDR-7506,Sennheiser HD-280 or AKG K-240S which all will absolutely blow these away.

Maybe that is what is being sold on ebay. If it is, it is a shame Koss feel the need to apply cost-cutting measures to their former, well regarded, Pro 4AA design. Even if it is to 'cash in' on the reputation amongst studio users amongst others, the cheapened version will do Koss's reputation no favours at all.

My Pro 4AAs look exactly like the ones you show in the second photograph: sage green in colour, with a solid (but slightly flexible) headband having a foam rubber insert. I'm not at home at the moment so cannot take a photograph, so you will just have to trust me.

Your second ebay link(https://www.ebay.co.uk/itm/Headphone...72.m2749.l2649) is for the Koss Pro 4AAAs, which as you will see are the same as those shown in the first photograph of your post.


One other thing I dislike is on most Koss phones is the very heavy coiled lead. Unless supported, it tends to pull down the left hand side of the phones.


Anyway, I don't want to go around in circles - I'm going out to enjoy the Autumn sunshine and share Zen with my fellow man. It's going to rain later this evening and will do so for the next few days.

ATB