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Just listened to some Fostex T50RPs today... WOW! - Page 372

post #5566 of 10597

I'm still laboring under the impression that mass loading right up to the walls of the driver housing helps increase bass depth, and therefore perceived amount, but I also haven't done any A/B-ing and am at a point where I don't feel the need to open/tweak them too much anymore.

post #5567 of 10597

IMO, mass loading the baffle all over with modeling clay aka "plasticine" helps the bass become tight and punchy with good extension. without it I felt the bass was hollow and flabby. I was using all bass vents open. The bass can be much attenuated by the amount of stuff you "stuff" behind the driver. ie a simple 2mm piece of felt gave me the impression of a roomier bass and lots of cotton balls gave me tight and passive bass. 

 

really you just have to devote some time to these if you want to be satisfied, there is no end all be all mod. 

 

Above all the most important mod you can do is to get a perfect seal between your pad and baffle. heck glue your pads to the baffle if you have to!!!! This will help the bass the most. 

post #5568 of 10597

 

OK, I'll try to get some plasticine. . . shove some foam under the pads as well. 
 

 

post #5569 of 10597

I got some modelling clay myself today as well, hopefully I'll have some time tonight to make some adjustments and see what happens to the sound :)

 

 

I will be turning this, or my second set in to a full woody project in the new year.  Myself and my father will be working on CNC machines to create the cups... and a big question we had was how much of an impact different woods would have on sound signature.  Of course the density matters, but how does it really affect things, are there certain woods that are the "go-to;" any advice as this would be a first time build for both of us working with wood for audio use.

 

Thanks


Edited by evanwier - 12/21/11 at 10:48am
post #5570 of 10597
Quote:
Originally Posted by bluemonkeyflyer View Post

Interesting idea. If you try it, let us know how it worked for you.

 

The Shure 840 pads are ~ 9 x 10.8 cm measured from the back outside rim width x length.
 



 


Thank mate.. so it's slightly oval shape just like my t500's cup,nice~~
 

i will get a pair of t50rp for myself after i get my E10 n plus an O2 built.. sure i'll put some fancy pic of it here..^^

post #5571 of 10597

Quote:

Originally Posted by Satellite_6 View Post

OK, I'll try to get some plasticine. . . shove some foam under the pads as well. 


You're going to have to go all the way with modding if you want good sound. Here is a fairly basic mod that should sound good:

 

1. Plasticine (non-drying modelling clay) in the back of the driver baffle. See pictures floating around for help on this.

2. One layer of Paxmate or Silverstone acoustic foam lining the cups. Nice and neat is the key. You need to maximize volume while covering as much surface as possible. You may or may not want to cover the top of that center post in the cups as well.

3. Take 6 regular sized cotton balls, tease them apart, and place them in the cups (6 cotton balls per cup).

4. Remove the felt on the ear-side of the driver baffle. Keep the protective mesh in front of the driver.

5. One layer of acoustic foam on the ear-side of the driver baffle. Don't cover the hole near the driver (or the outer screw holes that holds the cups together). Similarly, make sure you didn't close that hole near the driver inside the cups either with plasticine.

6. Use the 840 earpads. The stock earpads are horrible in both sound and comfort.

 

This mod keeps the stock felt/paper behind the driver and the stock felt over the open vents in the back of the cups. The vents should be left open, but you can close some of them on the outside with tape if you want to tune them.

 

If you still don't like how this sounds, you'll need to start doing some more "advanced" or permanent mods suggested by various people. My modded T50RPs easily reach down to around 30Hz and have plenty of bass. I would recommend checking out the latest version of the Rastapants mods with the 840 pads (sometimes called RP2i).

 

post #5572 of 10597

I completed bluemonkeyflyer's V6.3 mods today (see link below).  Amazing results compared to the stock cans.  

 

I have a pair of LCD-2s.  Am going to have to do some serious A/B comparisons.

 

http://www.head-fi.org/t/452404/just-listened-to-some-fostex-t50rps-today-wow/4290#post_7856037

 

Two things I didn't do in BMF's mod.  Didn't chisel off the dust cover from around the ear side of the driver....too risky in my opinion (easy to damage the driver is the tool slips) and the Dynamat sticks to the stock felt just fine.  I also didn't pull the foil off the exposed side of the Dynamat either.  The peel and stick felt sticks just fine to the foil and it is less messy that way.

 

I also raised the rear of the stock earpads by cutting crescent shaped pieces of the Paxmate foam and placing them behind each earpad on the rear side of the earpieces.  It is just stuffed in there now, but you could peel and stick the foam in place before putting the earpads back on.

 

Did not place any teased apart cotton balls inside the earcups behind the drivers either. How do others think this cotton ball mod affects the sound signature?  BMF stated he didn't notice a difference in the V6.3 mod.

 

Has anyone tried the peel and stick Paxmate foam as a headband liner?  Would be an easy mod to soften up where the hard rubber head band rests on the top of your head.  But, am wondering how well it would hold up over time?


Edited by BmWr75 - 12/22/11 at 11:16am
post #5573 of 10597

Quote:

Originally Posted by BmWr75 View Post

How do others think this cotton ball mod affects the sound signature?  

 

Has anyone tried the peel and stick Paxmate foam as a headband liner?  Would be an easy mod to soften up where the hard rubber head band rests on the top of your head.  But, am wondering how well it would hold up over time?


I think it's probably one of the most important mods for the T50RP. That is, any mod that attempts to do the same thing as the cotton is extremely important. It doesn't have to be cotton. I don't exactly remember what the cotton does or what the correct acoustic term is for this. But I have the general idea in my head and know it's an important mod. I couldn't get my T50RPs to sound right without teased cotton balls in the cups. Like I said, doesn't have to be cotton, and I'm sure there are better alternatives, but it made a big difference for me.

 

I tried using the acoustic foam on the headband. It holds up fine, but it doesn't really make it any more comfortable. Try LFF's suspension headband mod.

 

post #5574 of 10597

I just got in my 'mostly RP2' modded T50RP today... liking what I hear a lot so far. Very detailed, yet totally relaxed sounding. No harshness whatsoever. Great tone to the mids & highs, and very respectable soundstage for a closed can. 

post #5575 of 10597

To get the FA-003 pads, would I just contact Fischer via their contact page on their website?

 

For the guys with O2 amps, what gain are you setting your amps at to drive the T50RP's?

 

Thanks

post #5576 of 10597
Quote:
Originally Posted by Nevod View Post

Could anyone make some macro photos of Paxmate, preferrably next to a ruler? Also, how rigid it is? Soft stuff like the foam fillers in old car seats and armchairs, or rather rigid with thick walls?

I want to check some locally availible soundproofing materials, but in order to get something suitable I'd need a peek at the proper stuff.

I'd be very thankful!

 


 

I could maybe take some pics in my labs of various damping foams after the holidays. 

post #5577 of 10597
Quote:
Originally Posted by Twinster View Post

Long time no post here but I have been experimenting with different configuration and I would like to share a new mod That is very successful in my setup. I used thin cardboard stripe to make a "Sound Wave Reflection Filter" behind the driver and the result is very good (IMO).

 

Basically I removed the cotton and fiberfill and line the cup with Paxmate and add this round cardboard filter behind the driver. Try it and let me know what you think.

 

Here's some picture of it.

 

 

 

T50rp_CB_Filter2.jpg


Brilliant Idea - this should be quite effective at reducing sound reflections.  I am not looking forward to trying to remove the lining from my cup but paxmate is waiting.

 

post #5578 of 10597

As a Denon user. How do BMF/Rastapants fare with EDM/Electronica. Also I understand that The T50RP is a closed can, how well does it isolate, and how much does it leak?

post #5579 of 10597
I work at an AV company and while searching for some cables in a warehouse, I found a pair of dusty T50RP's. Unbelievable? Because I was searching for this for months. I gave it a listen, being the headphone otaku that I am. I was not blown away, but the sound was impressive. My sinus ached due to the dust. It was stock.

It was very midrange centric. Bass was rolled off as well as the highs. I suppose modding these bring out the bass and highs to make these perfect? Am I right?
post #5580 of 10597

Did anyone else see this and get excited?  tongue_smile.gif

 

Screen shot 2011-12-23 at 9.44.16 AM.png

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