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Hey Everyone,
I'm seeing several people EQing and looking for ways to add more bass or "warm up" the sound signature of the HE-350. We anticipated this, most entry level headphones have a lot of warmth and bass emphasis, and this tuning is more in-line with the neutral signatures found in mid-fi and up (per the measurements on the product page).
Knowing this is something that folks may want to adjust to their preferences, I figured I'd post a basic HE-350 mod that adds significant bass response and warmth (+3-5db from ~100hz sloping down to +1-2 db at ~600hz if I remember correctly). We have measurements for this mod, but I don't have them on my home computer so I'll post when possible.
This mod is very simple and fully reversible, it requires nothing beyond your HE-350 and a thin tool. I used a spudger from an iFixit kit we had in the office (see pic #1), but anything thin will work.
First step is opening up the back of the headphone housing to expose the back of the driver. To do this, take your spudger (or whatever thin tool you have) and CAREFULLY pry at the edge of the plastic ring at the 1, 11, 5, or 7 o'clock positions, prying gently at each position in sequence until the plastic ring comes out. The plastic ring has four protruding plastic tabs at those respective positions that slot into the housing, holding the plastic ring in place, which holds the black grille in place.
NOTE: These tabs are fragile: you'll be fine if you break one, but more than one and you'll have to find a creative way to keep the plastic ring in place (which matters because it holds the grille in place). The headphone will function fine without the grilles or plastic rings, but you'll have exposed wires and driver parts, clearly undesirable.
With the plastic ring removed, turn the headphone so the grille faces down. It should fall out, revealing the back of the driver.
NOTE: The back of my driver will look different from yours, dont be alarmed. The driver baffle has a ton of holes in it and different configurations of covering/not covering result in totally different sound signatures. The configuration pictured is my favorite flavor (I'll post measurements when possible) so experiment if you want, but don't be alarmed.
In the center of the back of the driver, you'll see a single sticker. Remove that sticker. That's it. Want to reverse the mod? Put the sticker back. I've removed and replaced the sticker many times without compromising the adhesive.
PRO TIP: Try the headphones before you replace the grill and plastic ring. The less you can remove and replace the plastic ring the better, again, you don't want to break those tabs.
Be gentle when you put the plastic rings back, just as easy to break the tabs on placement as it is on removal.
Give it a try and let the discussion know what you think!
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Moshin
3
Sep 30, 2016
WillMod works flawlessly :) The bass is boosted by a good amount. Now I can enjoy my music :)
GBos
1
Sep 30, 2016
WillGreat!! But djzzzzzz really why did you not mention this sooner with al lot off disapointed buyers :-) You can remove the ring with your vingernails btw.. Only a few mm push the ring to the center.
WheresMyDrop
21
Sep 30, 2016
WillMod complete. 3 mins & used my fingernail. Sounds even better. Thank you.
6EQUJ5
459
Oct 1, 2016
WillNow only if we had a mod to tame the highs. Yeouch!
*EDIT* And I just did this mod without using any tools. I used my finger nails only.
pmronline
21
Oct 1, 2016
WillThanks for the detailed instructions and pictures. Would appreciate if you can create and post a video of the above mod.
WheresMyDrop
21
Oct 1, 2016
pmronlineIt's so easy to do...no video is needed.
TheChrisAge
31
Oct 3, 2016
WillHilarious how this mod is both effective and easier than swapping pads.
westwest
73
Oct 3, 2016
Willtried the bass boost mod and it works....sounds so much better. thanks. NOTE: i didn't have any thin tool in hand, instead i just use my finger nails. worked perfectly well.
Somedudeman
49
Oct 3, 2016
WillHow long did it take you to get the rings back in? Mine came out in a few seconds of poking and now I've been sitting here for an hour trying to get them back on :(
EDIT: Ok so i got it, normally trying the same thing a million times doesn't pay off but i'm glad it did this time.
Mezoo
0
Oct 3, 2016
Willif i did this mod aaand replace the pads with the HM5 pleather , will the bass be too much and unpleasant?
meowmixmeow
16
Oct 3, 2016
WillI used a guitar pick to take off the ring. Sounds even better now. Thanks!
EniGmA1987
615
Oct 4, 2016
6EQUJ5See my mods a couple pages back before Will's mod post for stuff that tames the highs substantially.
6EQUJ5
459
Oct 4, 2016
EniGmA1987The instructions are unclear. You said you've placed a cut out of silicon foam the size of 50 mm where? On the outside screen mesh? Directly on the outside driver?
And then: " I took apart the headphones and removed the piece that mounts the speaker drivers inside the cans. Once that is open I moved my silicone circle cutout from the outside of the cans to the inside of the earcup in the same place."
So now you removed the 50mm silicon foam from the outside and put it on the inside and disassembled the driver mounts? So now there's no 50mm foam on the outer housing where the mesh screen is?
EniGmA1987
615
Oct 4, 2016
6EQUJ5All I did with that piece was after testing I moved it from being outside of the headphones for testing purposes to inside the headphones... But you really dont need to be so concerned about that, it does not do a whole lot to the overall sound signature. The two pieces in the earcup area are the big changes.
Xephyroth
237
Oct 5, 2016
WillTo anybody who has done this mod and broke the tabs on their mounting ring like me...I have taken the liberty of doing the measurements and basically creating a replica that can be printed via a 3D printer. Maybe some of you have access to one.
I'm using the MOD-t by New Matter. Your mileage may vary. Here is the model I've created:
https://tinkercad.com/things/kZiH6JzSt3M
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lo_tse
18
Oct 5, 2016
XephyrothHey, that looks neat. May be you can supply these retainers in different colours to owners in reasonable price. Excellent work!!
Xephyroth
237
Oct 5, 2016
lo_tseWhile I would love to be able to provide such a service, I would have to find a way of shipping them that wouldn't risk them breaking during shipping. On top of that, it probably takes somewhere around 10 minutes to print one of these, so I could only print 3 pairs in a matter of an hour.
My 3D model isn't perfect. It could probably be improved upon, which is why I posted it publicly for anybody to download and modify. You would probably want a more accurate 3D printer for a job like this. It's not the most clean-looking solution, but hey, I figured if it would be such a hassle to get HiFiMAN or MassDrop to provide a replacement, then why not make my own and make it free?
Heefty
1387
Oct 5, 2016
MezooI would guess that that would be overkill on the bass. I put on HM5 velour pads and sound signature quite warm. I've done a couple other mods too but I think the pads are the main source of change in the bass. The others mods were treble focused.
JacobJ
1
Oct 6, 2016
WillCan someone do a video tutorial?
xShaw
18
Oct 7, 2016
WillTried it. Bass became lose. Didn't like it and reversed the mod.
CaseyH
4
Oct 12, 2016
WillIm glad i came back to the discussion, i was a little disappointed in how little bass there was. After the mod it sounds alot better where i can actually feel the music. Thank you very much.
TheChrisAge
31
Oct 14, 2016
meowmixmeowMe too.
TheChrisAge
31
Oct 14, 2016
MezooI have the HM5 pads in pleather, angled pleather and the hybrids. I did the mod after settling on the standard HM5 pleather and I just half-undid (rocking the grammar today) the mod. It did hurt the midrange, a lot. Now I have the hole half covered with the HM5 pleather pads and I am very happy.
Magicalibre
4
Oct 25, 2016
WillMade a video showing how to do this. Hope this helps!

https://www.youtube.com/watch?v=uDHMiZXD2d0
Bruno3833
1
Oct 27, 2016
XephyrothYou gave me idea for painting my rings
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Arcmanov
34
Nov 8, 2016
WillJust received mine, and immediately consulted this post. Incredible difference such a little mod makes. Them stickers are goin in the trash, :)
Bigall
10
Feb 25, 2017
Bruno3833This, this is beutiful.
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