HD800 "French Mod" aka "SuperDupont Resonator"

I just got back from a business trip. The point of the license is to keep derivative or future works from being patented by some douchebag so no one else can use it.

There was some concern about this with the changstar mods, so we didn't want this to be a potential issue.

I will post on HF to explain.

 

On second thought nope, not going to wade in there. Nicklikesmusic kindly removed the post instead of attributing. HF mods should have done something by now.

As a reminder to HF readers out there: We are not trying to control content. We don't even care if people make money of the mod or derivative works. Our main concern is that someone would patent the work to keep it for only themselves. While a Creative Commons license is not a patent; it at least provides some level of protection against someone filing a patent for the mod as a unique idea of their own. This concern is a lot more real than most people realize.

 

Adding to what Marv mentioned. past mod communities and efforts have taught us that these things spread and become impossible for new people to follow. By trying to keep new developments free and keeping reference to the origin of various mods and techniques, we can make sure people know that there is a place to go to get really easy to follow instructions and the latest on various mods.

A bunch of folks have been in communication with me and we're going to create easy to follow instructions for EVERYTHING and launch in "versions". As the community contributes more and we iterate/evolve the mods, we can keep things sane and update the first post of every thread with links and information.

 

Okay : Here's my last resonator :


Felt + creatology . Outer diameter 14mm , depth 7mm (5mm felt + 2mm creato ) . inner diameter of the felt : 10mm , inner diameter of the creato ring : 6mm

Trust me , I tried different material ( rubber , paper , open cell foam) with different specs and the best I measured thus far is the one described above. Don't hesitate to propose some other material though.

How-to :

Good tool to do that work:



- Choose the 14mm and 6mm punches and mount it on the tool :



- Then you have the tool to cratology foam with good outer and inner diameters :

 

- 14mm and 10 mm punches for the felt :



- Cut the appropriate ring in the 5mm sheet of adhesive felt ( the one you put unter chairs feets)



- Remove the plastic of the adhesive face (I let the felt around the 10mm puncher in order the felt ring can circular)



- stick the creatology ring on the Felt ring:



- Put the New SuperDupont Resonator in your HD800 . Creatology flush to the top of the hole.



- Done.

 

Measurements :

- FR ( with the bunch of raw takes)



- FR compared :


Stock HD800 in red, Tip mod in green, Felt+Creato in Yellow, HD800S in grey.

The last Superdupont resonator is still - 3db @6khz but 4 Khzz is better so the Gap between 4 and 6khz is improved, which is my opinion our primary goal. Felt + creato improves the 8 khz as well . so the 6 khz sticks less compared to 4 and 8 khz. High treble range is "improved" as well. To my ears ( 45 years old though) that's not problematic at all but for younger ears maybe it's a draw back... i didn' find any improvements in Subs... I think more and more my first measurements could be unreliable in that area...

The most important point is that those results are consistent so we now can DIY the resonator and it always provides the same good result whereas results are somewhat hazardous with tips cutted to random dimensions.

CSD :



slight reduction of the 6khz ringing whereas my measurements of the Shure tips showed no improvement in that area.

Spectrogram :




Distorsion :



Achille's heel of the mod : See the Sub bass distorsion explosion. Nothing I can notice by ears though but that's a bad effect.

I can't give subjective impressions. i'm too involved so highly biased. I can build a bunch of those resonators for braves though

Next step : 7mm hole in the creato instead of 6mm and findind a way to use thinner ring of felt ( Still 14 mm outer diameter but mabe 12mm inner diameter) .. probably some other material than felt as well.

 

Is this the future?!?

What kind of felt are you using? I'm going to have to order some if the measurements and listening tests hold up

 

Me too. Just need confirmation from him before I buy a $200 hole punch set like he did

If this measures well, I might see if folks want to wait for me to cut some of these and send with their mod kits.

 

@zerodeefex : 5 mm adhesive felt to use under furniture feet. you see what I mean ? this http://www.amazon.com/MONSTER-MASTE...TF8&qid=1454169530&sr=8-1&keywords=felt+sheet should be good.

http://www.amazon.com/Mayhew-66010-Metric-Hollow-Punch/dp/B003PSUNX8 this set should be fine. Fortunately I paid mine 60$ from Boehm.fr.

My first attempt was with different material but maybe not as easy to source everywhere in the world. my purpose is still to obtain something easy to DIY with easy to find material and somewhat easy to industrialize if needed.

btw. I'm laughing at myself considering how much effort it needs to cut 3db @6khz wheread it's so easy to do it with an EQ .

 

time to go cheap: http://www.amazon.com/3-16mm-Leathe...1454169905&sr=8-26&keywords=hollow+punch+14mm

Let's see if those work . Ordered the felt, have the creatology foam already.

 

@spoony : ah yes. Good idea. I didn't see what you were talking about the first time you proposed it. open cell foam I used thus far brings no good things compared to felt.

 

For those of you in the US, this looks like the best choice (1/5" is the closest to 5mm you'll find):

https://www.amazon.com/gp/aw/d/B0140K7N00/ref=ox_sc_act_image_2?ie=UTF8&psc=1&smid=A1XJNN81TC9QEB