HD800 "French Mod" aka "SuperDupont Resonator"

Any specific recommandation? link?
thanks

 

I have something like this http://www.amazon.com/Non-slip-Bett...qid=1382810327&sr=1-8&keywords=mohawk+rug+pad
But I got it from Halex, who sold me the hp.

 

@sorrodje I expected as much it being small differences. I mean in the end what matters is the amount of fun you have with the can and that's what I'm having.

Looking forward to the Ety foam tips, I'm not too familiar with foam tips to comment on other tips much side the general few like the Shures, Westones, Tx00s and Etys.

@frenchbat and @cocolinho: https://shop.riteaid.com/con-tact-bath-mat-white-1-mat-0333690 is the one I'm using (also to be found on Amazon). After a suggestion by @OJneg who told me the bath mat @Bill-P used was the best he worked with. While the material that is used in the SBAF mod seems much better, sadly it's very hard to ship to Europe so I at least will be waiting until the mod ships. This is definitely the next best thing in my experience after about 7 different liners. It's both easier to put in (and stay where it is), much thicker and a breath of fresh air in terms of sonics. Maybe that can help out if you're on the look for a good liner and can't get the SBAF mod material.

 

@SKiring, yeah I would never take a razor blade near the driver. I meant actually removing the screen/shield by taking out the screws and pulling it off the driver ala Bill-P. That's the way I ended up putting the plugs in. Didn't feel comfortable pulling the screens off. Scissors would obviously work too. Don't know why I didn't try that.

 

Do play with makeup wedge foam, it's open-cell and very dense, I've had great results damping high frequencies with it.
They look like this.

 

I tried with some westone true-fit foam fwhich is much more dense than comply-foam. It works really well with great result in damping too. I don't have the bigger Comply-foam or large Shure Olives to compare with thou. http://www.westone.com/store/index....ucts/accessories/true-fit-foam-eartips-orange

 

Hmmm I was very tired when I finished this mod last night. Listening to them again they sound quite a bit better. I've ordered a pack of Shure olive large tips and I'm going to take another crack at cutting them doing a better job this time. Also curious to see the measurements from @sorrodje of the uncut tips.

 

Hi Guys, I'm new here but I just had to join best friends after reading all of the really interesting things you are doing with your HD800 's.To be honest I am blown away with your professionalism and what has been going on! I also have a pair and I am keen to experiment. I have a background in Physics and have access to a laser cutter and 3d printer but have had little to do with acoustics
It's hard to find some good information on Helmholtz absorbers but chapter 6 of this google book really goes into detail (book address appears below). In particular I read that that a helmholtz absorber needs a damping material just like a shock absorber needs oil to damp out oscillations. Anyway, my question is this...is the internal diameter of the centre cylinder in the 'black spiders web' just behind the dust cover of the HD800 the exact dimension as the one in the HD800S ?

https://books.google.com.au/books?h...v=onepage&q=helmholtz absorber design&f=false

Cheers

 

You see I am purely guessing (and I could be REALLY WRONG and also forgive me if I am preaching to the converted) that the centre cylinder of the standard HD800 is a Helmholtz resonator which combined with the headphone cavity gives the 6Khz peak and that adding 'oil to the shock absorber' i.e. some type of foam dampening material inside it will turn it into a Helmholtz absorber and allow us to reduce that peak as some of you guys have already demonstrated by adding acoustic foam of different densities.

 

Even if you could get a ruler out and measure it I think it would be good enough.

I just tried a very simple experiment. I placed a thin paper circular sticker over the central cylinder only on each can. Either the open pipe model has become a closed pipe (with lower fundamental frequency and missing even overtones) or the sticker has become an absorber for the open pipe , or a mixture of the two. In any case the 6Khz spike has really been reduced and using Audacity to generate test tones I now hear 5Khz louder than 6kHz. Interestingly I like the sound very much! I was hoping Sorrodje that if you have time in the future could you please take measurements of this simple mod. Or, please let me know the name of the equipment you are using to measure frequency responses and I will get my work to order it I have already glued two 3mm sheets of high density foam together as the material to use as my experimental helmholtz absorber to be placed in the middle of the ring and will use the laser cutter to make them next week to do some more experimentation.
Cheers

 

Stupid me can't upload a normal jpg to this site so have saved it to my avatar.

 

No, it's not happening for me for some strange reason, gives me an 'unable to upload'. Still, its a simple paper sticker that only covers the circular ring as seen in my avatar.​

 

@whipped so essentially blocking the top entirely.

I have open cell foam with an adhesive side I can try that.

Also imgur.com for uploading works fine!

 

@whipped maybe you could try drag-n-drop instead of the upload button? It might work with a downsized photo