[LG V30 Questions & Answers] RockStar2005:
Ok...........I will give you several to choose from then that all feature detachable cables as well (ranked from best to least favorite, but all are great):

1) The new AKG K550 MK III ($199.95): This is an updated version of the legendary K550 (and K550 MK II) headphones. Just came out recently. The ONLY difference with these is, unlike the previous two K550s, the MK III features a DETACHABLE cable and SAME sound signature as the K550. This (K550) was the 3rd premium headphone I'd bought, and the FIRST to really "nail it" IMO. It was the K550 that sealed my fate with regards to getting more seriously into Hi-Fi and Hi-Res music. I've referred to it in the past as having "a 'magic' sound signature" because of its ability to make the vocals (mids) sound wider than other premium headphones I had which made them sound more narrow. They have a huge soundstage, and are advertised by AKG as being "closed-back headphones with an open-back sound". I completely agree. This review by "What Hi-Fi?" (my "go-to" reviewer) says it all. They deemed it an Annual Award Winner at least 3-4 times since 2013, including this year as you can see.

After trying out SEVERAL headphones before and after having them (many of which cost $300-$400), the ONLY one I feel that outdoes these are my current HPs, the ($309) Meze 99 Classics. I recently upgraded its pads to the Brainwavz sheepskin leather non-angled pads, which gave me even more comfort and a wider soundstage as well (which lends to extra clarity). But the K55X series (I've had them all at certain points....K550, K550 MK II, K551, and K553.......they all sound the same btw lol) comes a VERRRY close 2nd to the 99 Cs. When I had the K550s and took them on the train, they always did a sufficient job in blocking out noise IMO. But the train I took wasn't very noisy, so I don't know how it is with you.

Addt'l Notes: The detachable cable that comes with the K550 MK III is 10 feet long. If you're like me and think that's too much, then I suggest buying this replacement cable that's only 3 feet long. Also, if buying off the AKG website, NOTE the free shipping code they give you to use on the Checkout page (FREE2DAY), and make sure to select the "2 Day Air Shipping" option on the Checkout page as well to ensure it ships for free. (This also applies to the K275 HPs below.) This is the case I had for my old K550s. Top-notch, though not cheap. Maybe something to buy down the line once you're sure you wanna keep these if you buy them. I tried cheaper cases but they always sucked. Zippers would be hard to zip, etc.

2) The soon-to-be-released AKG K275 ($169): (Release Date: 12/1/2017) These are what I would call a more portable version of the K550 MK III, with similar sound specs. If I HAD to guess, I would say the K550 MK III might be SLIGHTLY better, but the difference may or may not be negligible. These HPs fold in where the K550 MK IIIs only have folding ear cups. They also come with a bag for the HPs, where the K550 MK III does not.

Since these have not yet been released, there isn't much I can say about them. But knowing AKG, they will sound amazing for sure! The differences that I am predicting based on spec info comparisons to the K550 MK III are 1) The K275 has a higher bass "minimum", so it's possible they may not be AS proficient at rendering deep sub-bass like the K550 is. But the AKG page for the K275 emphasizes "greater low-frequency extension and detailed bass reproduction". So there could be another factor involved here that I'm not aware of? 2) The K275 has the same impedance (resistance in ohms) as the K550 MK III, but a lower sensitivity. This simply means the K550 MK III can get SLIGHTLY louder than the K275. Again, prob negligible.

Addt'l Notes: These also come with a long detachable cable (16 feet?), so you would still wanna get that cable I linked above if you got these as well. If you're not happy with the case, then PM me and I'll help you find a good case.

3) The Brainwavz HM5 ($109.50): A trusted friend of mine on Head-Fi told me he thought these were "200% better than the K551 HPs". While I usually trust everything he says, my issues with these headphones are 1) The plastic build, which is prob why they are so inexpensive. lol Where the AKGs use more premium parts, these are basically all plastic, which makes me question their durability. 2) I've seen pics of ppl wearing these HPs, and they look pretty bulky. Arguably more than the K550s do (though I personally didn't think they were bulky). Still, they seem pretty well-rated. My friend also said they are "great for classical and jazz music." Other positives include that it comes with its own cables, one long (10') and one shorter one (3'), extra ear pads, and its own custom hard case. Brainwavz as I mentioned earlier also makes really great ear pads that people use on other HPs, like the ones I got for my 99 Cs for example. You could always upgrade to one of these as well (they have others like velour, etc ones too).

4) The Koss Pro4S ($146): I've read some user reviews where people said they thought these sounded better than my 99 Cs! I've also heard that clamping force is a bit tigher, and since I'm still in the process of stretching out/loosening my 99 Cs (just a bit tight, but it's getting better! lol), I recommend these but with caution. lol Some ppl say the clamping force is fine though too, so I dunno. But the fact that some ppl even think these sound BETTER than my 99 Cs which cost like over double these makes me pause and wonder. lol The D-Shaped ear pads are pretty cool too, and they are well-rated. If you feel the clamping force is fine, these MIGHT be better than the AKGs above? I've only tried the K55X HPs from this list, so I can't say for sure. Comes with a 6' cable and a hard case too.

Review all these carefully then lemme know which one(s) you pick and how they sound.

Also, please confirm you're aware of the male/female adapter trick I mentioned earlier. The AKGs esp sound their best with PROPER amplification, and doing that trick will bump you up to the next higher/louder amp mode.