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Fostex T50RP Incremental Mods and Measurements - Page 62

post #916 of 2310
Thread Starter 
Quote:
Originally Posted by c61746961 View Post

Hey all, I was wondering if anyone has done comprehensive testing on absorption using cosmetic latex sponges like these: http://www.trim.com/?q=cosmeticsponges

Out of the bag they sound (against the ears) like they absorb a lot of midrange/treble energy. I installed half of one of the rhomboid wedges in each cup (0.5" thickness) and the results are positive and subjectively better than the other materials I had tried before (cotton wool, various foams), and I'm curious as to how would these compare against the proven absorbing materials like fiberglass or mineral wool. Anyone?

yes, see nick n's "makeup pad memory foam mod" near the bottom of Post #1 of FIMM :)

post #917 of 2310
Oh, yeah, I did see that, but AFAIK memory foam is viscoelastic polyurethane foam and these are latex, I thought they would have different characteristics wink.gif While you are at it, what would you use to replace the stock damping paper if one has no access to any of the creatology stuff?, also, have you got any of your 'naked' drivers develop a rattle at certain frequencies?, my left driver is rattling at 30Hz + harmonics up to ~1200 Hz no matter the damping scheme (even ones that completely smother the driver), I was wondering if I should disassemble the driver and look for debris, but that would be a last resort. Thanks.
post #918 of 2310
Thread Starter 
Quote:
Originally Posted by c61746961 View Post

Oh, yeah, I did see that, but AFAIK memory foam is viscoelastic polyurethane foam and these are latex, I thought they would have different characteristics wink.gif While you are at it, what would you use to replace the stock damping paper if one has no access to any of the creatology stuff?, also, have you got any of your 'naked' drivers develop a rattle at certain frequencies?, my left driver is rattling at 30Hz + harmonics up to ~1200 Hz no matter the damping scheme (even ones that completely smother the driver), I was wondering if I should disassemble the driver and look for debris, but that would be a last resort. Thanks.

Oh, I missed that. I'm not familiar with that material. Have you tried it?

I have not had a rattle with naked drivers. I think I'd try a vacuum, first. And look for anything that might be partially attached.

PM your address and I'll send you some Creatology felts to try.
post #919 of 2310
I tried the cosmetic latex foam as I don't have access to memory foam, it's very dense but still breathable and I think it works great at soaking the midrange energy, not sure about the bass since I feel it's slightly boomy at ~100 Hz, but my guess it is due to improper damping since I removed the original paper (sigh). I'm also having trouble taming the peaks at 8 and 10 KHz without killing much air, I've tried doing a reflex dot on the ear side but the attenuation is still insufficient for me frown.gif

I PM'd you about the kind offer smily_headphones1.gif
post #920 of 2310
Has anyone tried using the new shure SRH 1540 alacantra earpads on the t50 yet? They sell them on amazon now, I'm so interested
post #921 of 2310
And if anyone wants to try temperpedic foam inside the cups pm me, I have a bunch of it. I will experiment with but would like to see others experiences, I used some in my technical pro hpt 990s and it worked very nicely in tightening up the bass and seemed to make things a little more "airy"
post #922 of 2310
Oh, yeah, I've been eyeing those pads too.
post #923 of 2310
Thread Starter 
Quote:
Originally Posted by rudeboybass View Post

Has anyone tried using the new shure SRH 1540 alacantra earpads on the t50 yet? They sell them on amazon now, I'm so interested

Depending on the density of the foam inside the pads, with all those holes I predict attenuated bass. It will be interesting to hear impressions from you and others who try them.

post #924 of 2310

Does your tuning work for all sources ?

post #925 of 2310
Quote:
Originally Posted by bluemonkeyflyer View Post
 

OFS,

 

Enlarging the magnet frames on the ear side, only, reduces sensitivity by about 15 to 20%. Enlarging both ear side and rear side magnet frames makes them too inefficient without appreciable sound quality improvement. 

 

Ear side, only, magnet frame modification results in different voicing and more bass. I am still trying different damping schemes so "the jury is still out" with regard to the question of, "Is it worth the effort?"

 

To my ears, I like the sound of both Russian Modified magnet frames and stock magnet frames. Sort of like different flavors. The Russian mod works really well for me by making them completely closed - sealing all 4 cup vent slots.


Any more findings with this mod? Did you measure them ?

post #926 of 2310
has anyone sprayed the cup interior with plasti-dip? I'm thinking this would reduce lower end sonic vibrations being carried through the enclosure?
post #927 of 2310
Quote:
Originally Posted by rudeboybass View Post

has anyone sprayed the cup interior with plasti-dip? I'm thinking this would reduce lower end sonic vibrations being carried through the enclosure?

You're probably better off with paxmate or modelling clay/plastecine, and plastidip is just a re-coating like paint. I can't see that affecting the sonic quality very much.

post #928 of 2310
i should have elaborated that i would be applying a very thick layer, I'm thinking 2mm thick
post #929 of 2310
Quote:
Originally Posted by rudeboybass View Post

has anyone sprayed the cup interior with plasti-dip? I'm thinking this would reduce lower end sonic vibrations being carried through the enclosure?

 

I have read somewhere that someone did this.  I believe he filled the cups with liquid plasti-dip and let them dry for quite a while.  I read an ongoing discussion between the modder and bluemonkeyflyer.  My recollection is that it worked but was not an improvement on the existing mods described in this thread. It also required the modder to go thru a lengthy experimentation process to equal what had already been accomplished.

post #930 of 2310

I suppose any experiments with plasti-dip are at least easy to clean up if it goes wrong.

It should just peel off in one piece.

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