Head-Fi.org › DIY and Mods › Sennheiser 449 Mod Possibly 4 8 Mod

Sennheiser 449 Mod Possibly 4 8 Mod

Not satisfied with your Sennheiser 449 ?

Read this, Sennheiser 449 mod, boost your headphone - The best mod, granted!

Hello folks, its been a couple months since ive done this mod. Last year i bought the sennheiser 449 over the internet without giving it a try. I thought.. well its sennheiser its good.. and it is (now with my mod). However it wasnt that good when i bought it.
The lows and mids where fine (very good in fact). The main problem was the bass. It wasnt enough.. i could feel there was bass, but it felt trapped somehow. So i began researching for some mods.

Thats when i came across the modding 4*8 for newbies:


That tutorial was my kickstart.. it goes more or less like this: you open the headphone and you will notice there is some 'tape' covering 3 holes in the back of the speaker. You uncover those holes and you can feel more bass.
For me those 3 holes made a lot diference (for good). So.. why not make more holes? more holes = more bass.. untill you make too many holes and then its not good anymore.. so there must be that right amount of holes to make for good bass... from my experience i think 7 or 8 of those small holes are the peak for bass.

you will need:
the smallest allen-key/or/cd-ejector-key you can find... or some very thin metal. ** this will be used to make/drill the hole
small screwdrivers (to open the headphone):
pliers: http://www.networktoolsandsupplies.com/images/100-023.JPG
fire (from your kitchen)



Heat up the allen-key/or/cd-ejector-key and gently press the plastic to create a hole, you may use the fire some 5 times per hole... dont hurry up, because if you press hard then too much plastic will fall inside the case and you will not be able to remove it. Just have patience.


Open your headphone




Go close to the fire source
Hold the allen-key/or/cd-ejector-key with the pliers and put it in the fire. Wait untill the allen-key/or/cd-ejector-key gets fire red.




Position your hand in a comfortable precise way so you can make the hole on the back of the speaker as seen in photo

 Press it gently.
  *** dont press too hard because that way you will make a huge hole and will have unexpected results.
  ** the secret here is, be patient and press only a little bit ... that way you will be able to finish 1 hole with 3 to 5 switching between fire and hole.
You can start with 4, 5 holes.. see how you like it. i think i passed the point and made too many holes. for me 8 is good.


Position yourself it in a confortable way that allow you to make the hole with accuracy


So what you guys think? Anyone up to make such mod and post reviews ?

Dont be afraid... just goahead!


Comments (15)

Anyone recommends a best way to 'close' unwanted holes ?
Use electrician tape. And @ op, a similar mod has already been made me and another user except on the 4^8 page I took down all my mods due to a few issues.
I'm happy with mine :P
That's a lot of holes you made! One hole made a big difference for me, I can't imagine what 10 would sound like..
burgoc02, it only gets better, belive me!
Without this mod it is still better than the ath-m50
Sorry but you have no idea how much better your headphone will get.
You must have the guts to execute the mod slowly... you will get good results. first free the 3 "original" holes... and see the difference.. then you can guess how the rest goes ;)
I'll try it one day, but if it becomes a basshead can, ill hunt you down :P

I ended up sealing mine to it's original state... bass was too loose and uncontrolled for me. Was a fun experiment though :)
I might re-seal mine as well. I had a pair of 448s that got stolen...can't remember if they had this much bass (having modded my 449s out of the box without testing them first). I don't think so. This is a very interesting mod...I wish Sennheiser would make it easier to change the bass level on these cans (mechanically, and not with a variable electrical filter!). I know Sony had a pair with sliders on each earcup to allow or disallow outside noise. (I understand this mod just adds to the volume of air the drivers can push back and forth at low frequencies.)
Did anyone notice that the tape was transparent and looked like diffraction grating? (Like a microscopic screen door.) I wonder to what extent this is an air-current-dampener, and to what extent it is some kind of filter. Why would Senny use a lattice on this film if they didn't have to? Why is it transparent?
Loving my Fiio E17. Can't wait to try it with my M50s also.
Can anyone do a frequency response comparison?
Haha, that would be awesome.
Love the HD4xx series, only thing M50 has on them is isolation and build quality; if my HD439s matched the M50 in those areas, I wouldn't bother saving for the DT1350.
@Gilly87 well said, the m50 has isolation but very uncomfortable, and more bass (sometimes too much)
m50 hype train
Holy Crap, when i had my 439s they only needed a pin prick in one of the holes for me, and that was because i was just messing around. You are trying to rape your ears with this. I would seriously only poke holes in the tape covering one of those holes. maybe remove one. but goodness
This mod destroys overall balanced sound of these great headphones. They haven`t strong bass by nature, and it is much better to use EQ, if you want more. Sennheiser`s engineers know very well, why holes are sealed.
At least, give these headphones month or two of hearing, before you start doing something with sound.
Head-Fi.org › DIY and Mods › Sennheiser 449 Mod Possibly 4 8 Mod