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Just listened to some Fostex T50RPs today... WOW! - Page 245

post #3661 of 10599
Quote:
Originally Posted by AnotherN00b View Post

For those that don't frequent the Ortho thread, here's some super cheap sound dampening dynamat/fatmat alternatives that nick n found and shared there. Cheap as in $1-2 for a square foot!! Sorry Nick but why keep it a secret :)

 

45 mil rubber butyl (~dynamat/fatmat) http://www.edesignaudio.com/product_info.php?t=2&products_id=5

80 mil rubber butyl http://www.edesignaudio.com/product_info.php?t=2&products_id=786

.25" closed cell neoprene http://www.edesignaudio.com/product_info.php?t=0&products_id=55

 

I'm going to try the eDead 45 in my cups I think

I was considering the sound dampening paint they have, but that's a one way trip.

 

post #3662 of 10599

I'm sure this has been talked about, but what does that post in the middle of the cup theoretically do?

post #3663 of 10599
Quote:
Originally Posted by KneelJung View Post

I'm sure this has been talked about, but what does that post in the middle of the cup theoretically do?


Mounting for the headband.  

post #3664 of 10599

I want some better pads for my T50RPs. I got the Shure pads, but they don't fit very well and ripped a bit when putting them on. I also want a pretty think pad. How are the J-Money pads (http://www.jmoneyaudio.com/)? Which one would fit best on the T50RP?

The O2 pads are too expensive for me, but just for kick, where is the best place to buy them?

post #3665 of 10599


 

Quote:
Originally Posted by Hennyo View Post

I saw flysweep do this awhile back.. I applied acoustic foam over the entire earside baffle... When I did it the sound was very tiny. I actually found this configuration worse than stock Fostex T50rp.. I have to call mrspeakers about this. Then I put foam just under the stock pads, only to find I felt it was adding some sort of colorations...

 

I'm going to see if I can call Mrspeakers, just for clarification about baffle earside foam all the way around the driver. I don't know if LFF was performing it this way too, (hint) but I'm finding it amazing without.

 

Hey, do all the inside mods now (since you then won't have to open your cups ever again) and then wait for a response from Mrspeakers or LFF. I personally found foam on the baffle side to 'suck out' many frequency ranges in the spectrum and made the sound more tinny. I had it in for about 30 minutes before I decided 'this is not for me.'

 

 

I can't figure out weather your being serious or not, Wait, was I not supposed to? ^^ 

 

Michaels, Jo-anns. A craft store. 

 

Hi...

 

A couple of things.  First, my mod is currently specific to the O2 pads.  There is a major difference in sound between pads.  The essence is that my mods were meant to be made entirely as I specified, except the dynamat is optional (but good). With stock pads, I would expect the mids will be too prominent, which you're still using.  The stock pads mostly cover the baffle so the paxmate isn't needed there.  Probably adding it will bleed bass into the pads and further exaggerate the mids, so having no foam will sound better.  Not so for the bigger 840, 5000 and O2 pads.  Different beasts.

 

If you still find the sound thin and you're using the pads, to restore a BIG sound, you'll need to open that vent (until you have the O2 pads) and take out the ear side foam.  This will boost the bass and mid bass, equalizing the sound.  Start with  a VERY tiny 1mm slot if you still want more bass.  Maybe even a pinprick or two.  Like I said, I haven't' evaluated the stock pads at all, so these are best guesses.

 

I'll be working on 840, 5000 and stock tuning over the next few weeks.

 

 


Edited by mrspeakers - 10/10/11 at 8:31pm
post #3666 of 10599
Quote:

Originally Posted by mrspeakers View Post
 

Quote:
Originally Posted by KneelJung View Post

I'm sure this has been talked about, but what does that post in the middle of the cup theoretically do?

 

 


 

Mounting for the headband.  


I see said the blind man. That makes sense but why did they engineer it like that? It would seem that it may have some impact on the sound too.

 

post #3667 of 10599

It does.  It acts like a reflex dot as it's so close to the driver.  In my mods I block this because it added a real spike in the mids.

post #3668 of 10599



 

Quote:
Originally Posted by mrspeakers View Post

It does.  It acts like a reflex dot as it's so close to the driver.  In my mods I block this because it added a real spike in the mids.


What if the sound waves that were being directed at that surface were reflected off a concave surface rather than a flat surface, how might that effect the sound?

 


Edited by KneelJung - 10/10/11 at 8:47pm
post #3669 of 10599

^ wouldnt it be sweet if you could engineer a cup in which all waves were directed to a focal point where they canceled eachother out?!

 

food for thought :p  I think this was put forth before a while back, so i cant take credit for that and maybe the r10 or some headphone already sorta does that?

 

idk, i love this thread, so much free flowing ideas!

 

M

 

 

post #3670 of 10599
Quote:
Originally Posted by KneelJung View Post

 

What if the sound waves that were being directed at that surface were reflected off a concave surface rather than a flat surface, how might that effect the sound?

 


If it's a parabaloid it beams the sound to a focal point, then it spreads back out.  So in practice, nothing particularly different than why the dot does... 

post #3671 of 10599

Well here's something else to consider. At the very least you can look at some nice  technical graphs, and get a good read out of the links. Interesting.  Does this make up for the previous lack of consideration for the thread here? rolleyes.gif

 

I'll quote the entire post.

 

 

Well that above link I left for people seems very steep in shipping, at least to me in Canada, so in the course of digging around and running on instinct I managed to find this. With all the talk of Silverstone dampener, This looks a bit better. Apparently they developed it themselves, and patent details are available on request, as it says in the small print.

Nice  thing about this is that it's not simply a rebranded product, so you know at least who made it and what it is. And there's no unnecessary price hike for no reason.

 

Disclaimer:I have yet to buy some of this to try.No idea how it is.

 

Also for anyone who cares, there's big fancy colorful professional GRAPHS from testing.

Everybody in here likes the graphs, right.

 Check it out.  If you will notice from the various links, there are a few versions.

  •  Big Blocks for space filling ( not very applicable in headphones ) and some egg cratey type with larger surface area
  • 2 layer stuff various thicknesses
  • new 3 layer stuff in 3 thicknesses, 7, 12, 13 mm respectively. The 7 and 12 seem the most available.

        This 3 layer has the denser layer in the center decoupled from the mounting surface.

 

A really interesting read.

Here's the manufacturer:  in one of those links there's a tech specs link.

http://www.acoustiproducts.com/en/acoustipack.asp

http://www.acoustiproducts.com/en/materials.asp  general overview a graph or two, and some details about its composition.

http://www.acoustiproducts.us/en/acoustipack-extra-s.asp  this is the single sheet . notice down at the bottom left there is sellers list for US/Canada

 

here's the North American Distributor, also a seller: See the nice graphs.wink_face.gif

http://www.quietpcusa.com/AcoustiML-OEM-3-Layer-69-13mm-Soundproofing-Materials-P563C69.aspx  this is for the bulk OEM stuff large quantities.

 

Be aware there is both 2 and 3 layer stuff when looking, various thicknesses.

For instance the "EXTRA" single sheets come both in 12mm and 7mm.They are 18"by 17" I think.

I read a review that said this stuff has some heft to it.

 

 

Gonna try some soon ,hopefully, unless I miraculously come up with a stunning DIY Cheapo solution. Maybe someone's already tried it?

 


Edited by nick n - 10/10/11 at 10:59pm
post #3672 of 10599

Nice find.  The three layer stuff is probably all too thick.  Couldn't quickly find how thin the 2 layer goes...  If it gets too thick I'd worry about overdamping and killing the bass.

post #3673 of 10599

 

 

Quote:
I thought it was important for the foam to be open-cell?

 

Closed-cell foam did not work for me.

post #3674 of 10599

Resting my aching neck after trying a mod that made it heavier :P

51lFk33e6pL.jpg

post #3675 of 10599
Quote:
Originally Posted by mrspeakers View Post

 

 

I'll be working on 840, 5000 and stock tuning over the next few weeks.

 

 


i found that i needed to stuff some cotton between the pads and front baffle to get a good fit with the SA5000.  their circular opening tends to concave at the top and bottom of the oval Fostex earcups, leaving openings that thin out the bass too much.  i just stuffed the rear and top/bottom for a little driver angle.  creating a larger volume between the ear and baffle opens up the SS a bit as well.  this is going to be dependent for various head shapes.   the SA5000 pads definitely have less bass than stock pads though.

 

right now, i have the best pair of HPs i've ever owned.  while i will try the Rastapants2 with my next pair of Fostex, what i have right now is so pleasing that i don't feel inclined to screw with it.  speed, transients, tone, timbre, detail and bass that has weight, digging deep, with zero overhang or being to ripe.  

 

my mods are basically what i posted earlier in thread, except more plasticine around the rear driver/baffle, teased cotton balls inside the top half of the ear cup (covering the headband mounting post), and cotton stuffed inside the SA5000 pads.  just tune the vent with tape for mid-range and bass.   

 

a big thanks to everyone!  

 

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