Here is massdropâs own 2.5 balanced cable.
I looked really quick and didnât find a better price for any if the Amazon options.
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i just thought they didnât sell these individually
Easiest mod ever? More soundstage (just remove the foam).
After using only my T50RPs for weeks, I tried my HD58Xs again. Oddly enough, it sounded like they got less soundstage than my closed-back T50RPs with âshoulder-wideâ soundstage. So, with pictures, hereâs how to add soundstage to your HD58Xs.
Step 1: Find a knife or something similar, locate the little separation, open (someone did it with their fingernails but oh god I donât recommend that â guitar picks maybe?).
Step 2: Remove the foam.
Now you can listen to music like that and see (âŠhear) what you prefer. Graphs show it does not change anything to the frequency response anyway. It will just add soundstage⊠and instrument separation, maybe.
Just, play music and block the hole with your fingers and you will know why removing the foam can make a difference.
Step 3: It just clicks back in place.
Thatâs it! If you like the result, as a bonus, you now have two pieces of foam for your future audiophile experiments.
Also, now, you can just put your fingers on the grills, and hear the difference the foam (or lack of foam) makes â and why. Now you got really open-back headphones!
(And yeah, actually, T50RPs are technically semi-open. Why? Because thereâs a one square centimeter grill. And thatâs also one of the reasons why they donât sound closed/muffled.)
Also, funny shit: I found an old thread on Reddit, people were arguing âit changes nothing, itâs just placebo, FR graph is the same, audiofoolâ â And Iâm thinking: Yeah⊠could you tell me where soundstage is on a frequency response graph? 
)
Enjoy! 
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I would recommend doing the felt mod on the drivers where you take a piece of felt or foam and double sided tape to put over the hole on the driver to prevent dust or hair getting in. One of the purposes of The foam on the chassis is to act like a filter
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Wouldnât it do the exact opposite and remove all the soundstage? lol.
Just donât do it if youâre worried about dust, IMO.
I personally didnât notice any difference with or without foam so I leave it in to keep dust out and hide my ugly TP mod. I also donât really care about soundstage as much as many others so maybe thatâs why I donât notice any difference.
Also the mod @RiceGuru described would affect the frequency response but not the possible added soundstage as it ONLY coveres the hole in the magnet and not the entire back of the headphones like the stock foam (I did this mod but with TP, not foam/felt). Since itâs a porouse material itâs not like covering the hike with your finger as air can still move, just less than without the mod. It lessens the bass which I find makes dekoni elite velour pads sound like stock.
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I honestly hate that the first thing people do is remove foam from open back headphones. That foam is protecting your drivers. Too much risk versus the gain in soundstage imo.
Itâs not really a gain in soundstage, itâs more a gain in physical openness
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I understandâŠI just donât like the risk for minimal gainsâŠespecially considering my luck, lol.
Yeah thatâs the only reason why I did this. Spent some time A/B-ing, testing, left ear with foam and right without and vice-versa. Confirmed added soundstage and possibly better instrument separation.
Oh, right. I might just⊠cut a round piece of this foam and stick it there (blu-tac, glue, whatever).
Is it that risky? I honestly donât know.
It is much more risky with a planar magnetic, but still riskyâŠespecially with my luck, lol
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Even more risky with estats lol, very risky
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Are you the one who stuck a screwdriver inside his T50RPs? 
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No, Iâm the one that had 2 schiit fires in the past and 3 hifiman qc/build issue failures, lol
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Oh fuck lol 
âFâ
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Once I purchased a power conditioner though, I have had 0 issues. Knock on wood, my Bifrost 2 has been going strong for almost a month now.
Hifiman thoughâŠI believe Iâm on Dr. Fangâs blacklist somewhere, lol.
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Youâre right, by the way. Itâs subtle. Definitely doesnât make it sound twice as wide. 10% more maybe. No difference on soundstage on some songs even, probably. But you hear the sound is⊠âfreeâ. Therefore itâs a really subtle thing⊠that totally removes the impression your head is âin a bowling ballâ when the soundstage on some songs is not enough. Iâm not going back.
P.S.: No, HD58Xs are not âclaustrophobicâ by any means, with or without the foams⊠theyâre open-backs dang it! 
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Iâm currently selling my like brand new HD58x. If anybody is interested, please DM me.
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Me me xD Dmâd you
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Now this is really getting spooky⊠
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