Luckily for me i got free shipping (over 50$ some items have free shipping), and I live in Israel.
Normally its either ridiculously expensive, free or in most cases - Wount ship
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I guess Iāll get me a pair of Red Hot Porta Pros first (gifted my classics to my niece a few weeks ago) to compliment my 75s and will wait for the KPH40 to be in stock again. No prob! 
Just received my pair of KPH 40s. Koss is just on the other side of town. Iāve been listening to Amazon HD for the last hour and they are really impressive, like this is the last pair of headphones youāll ever need to buy impressive. Iām running a tone 2 pro dac amp from my pc so I can run the single ended kph40s and my balanced Goldplanar GL2000s at the same time ā and damn theyāre close. If anything the kph40s have higher resolution than the GL2000s. By the way, the tone2pro is maxed out to run the kph40s so they need a lot of juice; if someone figures out how to balance the kph40s it would be game over for every other headphone, and letās not talk about iems. And yes, the connector on the kph40 is a standard 2.5 TRRS identical to all my balanced 2.5 connectors. So how do they sound, female vocals are full and rich. Horns and drums very realistic and in your ear. The only thing missing is sound stage, the sound of the room, the very bit that puts the real into realistic; so maybe there is a role for your stupid expensive headphones after all, but itās a close run thing. So Zeos aināt lying again. Damn.
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Just received my KPH40ās and ran some test tracks through them from my LG G7+ for some first impressions.
Sound wise I really like them. They have a pretty well rounded sound with good extension up and down, and good soundstage. The only thing I am noticing, and this just might be me imagining things, but they seem just a bit light in the mids making them sound a tiny bit hollow. I have a feeling burn in will help with that.
Fit wise they are not too clampy for me even with my rather large head. The drivers seem so small coming from 30iās and the extra real estate of those ear pieces (and my large ears). I only listened for less than an hour so no idea if I will have to worry about hot spots, etc. Given the size of the drivers you need to move them around and find the right spot on your ears for the best sound. Once you do though, you will be rewarded.
Build wise I like the minimalism aspect to them. They remind me a lot of the headphones from my first walkman back in the early 80ās. The pads are good compared to 30i stock pads, but I will be glad to see what Yaxi, or whomever, will offer down the road.
Once I burn them in a bit I will give them a run on the desktop rig and compare to the Yaxi and Ultra 30iās.
Ideas for possible mods are already forming, we shall seeā¦
I know, now I need to get the KPH40. Those are new ones that look like the OG 80s era Sony Walkman ones, but in a flat grey finish on the metal. He claims they sound better than the 30i.
I can run the single ended kph40s and my balanced Goldplanar GL2000s at the same time ā and damn theyāre close. If anything the kph40s have higher resolution than the GL2000s.
Not sure if thatās a compliment to the kph40s or a knock on Goldplanar 
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Listening to mine a bit that I got today. So far, the kph40 is the worst sounding pair Iāve heard out of koss so far. It sounds cheap and not like their other stuff. But that said, the kph30 needed some break in so Iāll try these our for a bit before giving actual impressions.
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Wow, and I know youāre feeding it some top end gear too.
Iām going to let mine burn in for a week or two before I try any critical listening with my desktop rig and comparing them against my 30iās.
They are not perfect out of the box, but I like them so far.
Iām only using my BTR5 right now. The RNHP is out on loan but Iāll use my Vali 2+ or mz2 later. You get in your face with some details but it doesnāt resonate how I hoped.
I will say, for $40 it sounds amazing. But the fan favorite koss stuff on the the BTR5 sounds better so far. For reference, the kph30 took some break in in my experience and the porta pros I have sound great with the yaxi pads.
Now the goodā¦ The kph40 is so light and holds better. So if you want put on roller skates and get those old school walk man vibes, these are great. The comfort is outstanding.
So far the bass feels a bit less precise and something in the 4k-5k range is strange. Nothing bad but maybe itās me trying to hope these match the Zeos hype.
Maybe itās time I try these out with the Hugo 2 and see what happens.
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Good news, the kph40 sounds better on the Chord Hugo 2 over the BTR5. Not sure if that means anything to anyone but the headphones definitely sound like they may need 24 hours of break in or brain burn in.
I recall Zeos saying they do scale well so that result does not surprise me. That is why I am looking forward to trying them with my desktop setup after some burn in.
Just need a Chord Hugo 2 haha clearly need an m scaler too lol.
Would make for a great kph40 meme.
Verdict after night 1. Kph40ās are the worst sounding headphones of the Koss I own to date. Still a bargain at $40 USD compared to skull candy. Super comfortable, but I like porta pro, 75, and 30i better. Why? Better instrument separation resolution.
The kph40 is super comfy but letās see how it sounds with the USB C utility wire. If that does not fix things, it looks like itās time to get another Porta Pro and put on Yaxi pads.
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Even if they sound bad, at least you can salvage the headband and repurpose it.
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So basically, youāre saying its the āworst student in the gifted classā? 
have you had a chance to get the Utility porta pros?
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First comment: I wouldnāt say itās a gifted class. Donāt put these headphones on a pedestal.
Second: I have the regular porta proās and I think I prefer them for phone calls due to the mic placement with the BTR5.
The USB-C cable came in today soā¦ I FINALLY HAVE A HEADPHONE JACK AGAIN!!! Sort of.
Just got the kph40 in, straight out of the box I find them to be rather muffled sounding. Running off of a questyle m12 dongle for now. Will give them a try on the desktop gear later today, and try some burn in.
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The USB-C cable for the KPH40. Itās as good for buttons and operation as Zeos says. Howeverā¦ it doesnāt sound as good as the BTR by a mile or 20. Butā¦ I think it sounds better than some of the headphone jacks Iāve heard on many phones and laptops so that is something.
It may suck but Iām glad to have a nice inline feeling āheadphone jackā feeling again. The DFC is too bulky to be used and the microphone works well enough in a pinch.
But as far as sound quality, everything sounds less intimate and even more vague. But I can say if you miss some sound signatures of cassette decks, this dongle + KPH40 brings that sound signature (I think) and without the hiss.
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