Sennheiser PC350 bass mod

For all you Sennheiser PC350 owners out there who find the headset lacking bass there is the following mod.
I did not come up with the original idea, but it was lacking a proper instructable.

I recently bought a new soundcard and while the sound output was superb, I found the headset itself was lacking some bass.
stumbling the web I found that there were some users that modded the casing of the drivers with a couple of holes which would greatly add to the bass from the headphone.

At first I didn't believe it, but because I could always close up the holes again I decided to give it a shot.
The reason it works is because the PC350 is a closed system, adding the two holes allows the air to flow more, adding more bass response. This is however at the cost of fidelity. Which is the reason I decided to close mine back up.
Maybe I originally made the holes too big, I will address the sizing in the instructable itself.

**NOTE: opening up your headphones voids your warranty, if you do not want this then this instructable is not for you**

Step 1: Tools needed

Tools needed:
- Small phillips screwdriver
- 2 mm drill
- Cordless drill

Comments

[KiyoshiAphelion]

Alternatively, you could heat up a paperclip, or small screwdriver tip, then use it to melt a hole. This way, you don't have to worry about shavings getting in to your driver.

I'm excited to do this mod, but since I got my pair refurbished I will wait until my warranty is up to try it.

[Pointy]

A small soldering iron or any of your suggestions would work.

However, you will definitely be pushing material inside during melting.
A drill-bit is designed to extract chips from the part.

It's just a matter of slowly inching the last drilling parts and not forcing the drill in.
Let it do it's work.

When you hit exactly the right amount of pressure and drill-speed you get these nice curls of plastic coming out of the hole, this is what you're aiming for. :)

[thegeeke]

As an audio engineer I have to say that there is too much emphasis on bass in today's world. :)

[Pointy]

True,like I said in the instructable: I closed the holes I made, because it was just too much.
This is definitely a mod for those bass lovers out there (and there are quite a few).

Still I would've liked this set even more if they had just a tad more bass. =)

[thegeeke]

Have you tried adjusting the EQ? If it's just a little adjustment, that can be done from the EQ. (Or maybe you already have that turned up all the way?)

[Pointy]

EQ is already adjusted

[thegeeke]

Ahh... Oh well. I figured that if you knew to add "vents" you would probably know about the EQ... but it never hurts to ask! ;)