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HD650 closed headphone mod

post #1 of 14
Thread Starter 

Although the sennheiser HD650 are a fantastic sounding headphone, they do leak a lot of sound (which can be harmful during a recording) and they do not isolate (something I dont like while I use these for drumming).

 

In order to make these headphones more isolating and less leaking, I will try to close the back end.

 

I will use a sound absorbing product, attach hooks with elastic to the sound isolating product, and hook it around the earcup.

I hope there is a sound absorbing product that is capable of the job, so that most leakage is literaly absorbed.

 

In order to make them more sound isolating, some kind of sound reflecting product like hard plastic could do the job.

 

So basically what I want are two sound absorbing and sound reflecting patches that I can hook around the earcup.

Since this will probably effect the sound quality a bit I want it to be an adapter, so that it can be removed without damage to the hp.

 

I think this will help in the sound leakage department, unfortunately in order to make it a sound isolating headphone it will need specialised ear cushions, something I dont know where to get or how to make.

 

Any advice/suggestions/questions?

 

I think this could be a cool project.

post #2 of 14

I think you're better off getting a cheap set of closed back cans for when you need isolation as the HD650 would sound like crap anyway as soon as you close the back of the drivers.

post #3 of 14
Thread Starter 

I already did some tests and the sound isn't that much affected by closing the back.

Plus it can me removed at any time.

I actually have a dt770 pro, but I really don't like the sound of it.

post #4 of 14

they are not as popular anymore but headphile hd650 sounded alright, especially, deep chamber ones.

but again, open back sounded better.

 

oh, those chambers are removable.

 

post #5 of 14
Thread Starter 

I already did some testing with some sort of tar/lead mix that is used to reflect sound in speakers.

I put some cotton cloths on the inside of the layer of the tar like substance and it actually took away a lot of the leakage.

I will do some more tests with other substances!

post #6 of 14

Maybe try a couple of layers of speaker cloth.

post #7 of 14
Thread Starter 

What I was searching for, was some sort of hightech sound absorbing material I know I saw it somewhere on the internet!

 

 

post #8 of 14
The AIAIAI TMA-1's sound just like an HD650 and can be had for around $160. Seems like the better option to me.


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post #9 of 14
Thread Starter 
Quote:
Originally Posted by jasonb View Post

The AIAIAI TMA-1's sound just like an HD650 and can be had for around $160. Seems like the better option to me.
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I don't want to buy a new headphone, I have a closed headphone, and I am very happy with my hd650.

I would just like to see if it would be possible to close the hd650 up.

This project is more about exploration and curiosity than it is about results.

post #10 of 14
Quote:
Originally Posted by Marleybob217 View Post

What I was searching for, was some sort of hightech sound absorbing material I know I saw it somewhere on the internet!

 

 



dynamat.

post #11 of 14

Buy some extra rear grilles, and line the insides with dynamat. You can swap the grilles when you need closed or open back (they're fairly easy to remove)

post #12 of 14
Thread Starter 

Update

 

I actually have two cups now, made of a 5mm layer of lead brutamin which is basically a sort of tar/lead mixture that looks like hardened plastic.

On the inside of the cup I have a double layer of coton cloths.

 

I haven't been able to attach them to the headphone proberly, I do have hooks and elastics but it is hard to attach these to the brutamin without making it look very ugly.

 

First results (manually holding the cups): Significant improvement in sound leakage, I can now listen to music with my girlfriend sleeping in the same room.

Sound isolation: Little improvement, I just tried playing the drums with the cups which was quite the challenge since I had to manually hold the cups against the back of the headphone.

Luckily my feet were still free!

 

It isolates a bit now, It sure makes the drumkit much less harsh which was pretty much what I was hoping for, so succes! And I am selling my dt770 pro's since these actually isolate to well and making my drumkit sound to bassy with almost no cymbal sounds.

 

So I would say succes, I have only spent like 7 dollars, I just need to attach the hooks to this weird brutamin substance and I am done and pics will follow soon.

post #13 of 14
Thread Starter 
Quote:
Originally Posted by liamstrain View Post



dynamat.



I will definitely try to find a seller that sells these in very small quantities, I have only seen it in packages.

 

I am quite curious how much better this works than brutamin + cotton disks

post #14 of 14
Thread Starter 
Quote:
Originally Posted by Marleybob217 View Post

Update

 

I actually have two cups now, made of a 5mm layer of lead brutamin which is basically a sort of tar/lead mixture that looks like hardened plastic.

On the inside of the cup I have a double layer of coton cloths.

 

I haven't been able to attach them to the headphone proberly, I do have hooks and elastics but it is hard to attach these to the brutamin without making it look very ugly.

 

First results (manually holding the cups): Significant improvement in sound leakage, I can now listen to music with my girlfriend sleeping in the same room.

Sound isolation: Little improvement, I just tried playing the drums with the cups which was quite the challenge since I had to manually hold the cups against the back of the headphone.

Luckily my feet were still free!

 

It isolates a bit now, It sure makes the drumkit much less harsh which was pretty much what I was hoping for, so succes! And I am selling my dt770 pro's since these actually isolate to well and making my drumkit sound to bassy with almost no cymbal sounds.

 

So I would say succes, I have only spent like 7 dollars, I just need to attach the hooks to this weird brutamin substance and I am done and pics will follow soon.


Cotton disks! not cloths!!

 

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