One thing I REALLY hate about the Linear Ex case is the super small cutout for the headphone jack and Lightning port. Limits what adapters and headphones I can use. Today I went out and plugged in my aux cable in my car as usual. Guess what? Couldn't fit. It is a Griffin cassette adapter with a right angle jack. I went to RadioShack to try and find an adapter but no luck there either. So I decided to DIY.
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Tried the experiment first on the extension that came with the adapter. Success! It works! It adds extra length even after tying up but at least it works

After that I decided to try all the earphones and headphones I had around the house.
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Grado SR80i couldn't fit. The black housing is too fat for it to fully connect. Sound only comes out from one side otherwise.
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Skullcandy taktaumodel lying around, victim of my first attempt of DIY. Rubber too hard to chop off

Works perfectly, maybe because its quite skinny.
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Sony dunnowhatmodel also lying around. Works fine.
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Beyerdynamic XP1 just barely works. Looks too big but there is a reason it works.
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The rubber housing is soft enough to be squashed into the hole so it fits snugly. A bit hard to squash it in but after that no problems.
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Only way to use the Grado headphones with the phone without DIY

so bro this linear casing inside got rubber or all steel scared scratch my phone >.<