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Just listened to some Fostex T50RPs today... WOW! - Page 389

post #5821 of 10599
Quote:
Originally Posted by pyrokid View Post

Sub-bass is stronger in the right for me too. It's the song, I believe.



+1

post #5822 of 10599

Alright, thanks guys.

 

...it still really bugs me how I damaged my pair so badly though.  A plastic clip actually fell out of the cup last time I opened it up.

post #5823 of 10599
Quote:
Originally Posted by steelle View Post

Just about done with mods on one ear, will throw up pics when I get back on monday.  Mods are based on the RP2:

  • Plasticine inside surrounding the driver, paxmate ontop of the plasticine
  • Fatmat in the back of the cup, paxmate covering the entire back of the cup (covering both the vent and the center post)
  • 4ish Cotton balls torn up and clumped together in the cup.
  • 840 pads

 

Notes:

  • I left the black felt over the vent in the back of the cup
  • Left the felt on both sides on the driver intact (the white felt on the cup-side, and the black felt on the ear-side)
  • I didn't put any sort of reflex dot on the white felt on the driver.
  • Mrspeakers advises 6-7 cotton balls "teased and spread evenly in the cup", but I definitely could not fit that many in and still be able to close it.  I also don't really know what spread evenly is supposed to look like, mine just looks like a one big ball of torn up cotton.

 

So the left ear is completely stock, and the right ear is modded as above, and while I haven't sat down for an extended listen I am already amazed at the clarity and strength of the upper mids and highs.  Very detailed and clear.  The problem is the lack of presence in bass and lower mids.  I'd even go so far as to say the bass is practically nonexistent.  What do I need to do to fix this? I'm also not incredibly impressed with the sound of the 840 pads, although they are much more comfortable, it just makes the sound too distant.  I suppose it's worth stating that I've only listened off my ipod, and as soon as I get some AAA batteries at the store tomorrow morning I'll see if my airhead will have enough juice to make these sound any better (yeah I know I know, I've been trying to save up for a decent dac/amp)


Been thinking and the only thing I can come up with is taking off the felt on the driver and the felt on the vent. Hard for me to believe this will have that much of an impact on bass though...
post #5824 of 10599

Has anyone figured out what the heck these 4 little rubber bumpers do?  Connect the cups to the baffle in a way that reduces resonance I assume.  But they keep falling off.  Anyone notice any SQ differences with/without?

 

Probably been discussed but I have no idea what to search for. 

post #5825 of 10599

Are you talking about the 4 little cylinder pieces on top of the "towers" in the cups? They ended up falling off while I was doing some earlier mods and then just took the others off as I didn't see what their purpose was. If they had any effect on the sound I didn't hear it.

post #5826 of 10599

Yeah.  I'm not sure, but I'm guessing they hit the baffle, the "towers" put pressure and this makes the cup more rigid along with a vibration buffer.  Or whatever you want to call it.  A shock absorber. 

post #5827 of 10599
Shock absorbers. They decouple the baffle from the cup and reduce mechanically induced distortion.

Quote:
Originally Posted by rhythmdevils View Post

Has anyone figured out what the heck these 4 little rubber bumpers do?  Connect the cups to the baffle in a way that reduces resonance I assume.  But they keep falling off.  Anyone notice any SQ differences with/without?

 

Probably been discussed but I have no idea what to search for. 

post #5828 of 10599

They seem too short to meet the baffle, but yeah that seems likely.  I need to get mine back on I must have distortion!  Just kidding, but they seem like a good idea. 

post #5829 of 10599
The screw heads at the four corners of the driver mate to the top of the four rubber shock absorbers.

Quote:
Originally Posted by rhythmdevils View Post

They seem too short to meet the baffle, but yeah that seems likely.  I need to get mine back on I must have distortion!  Just kidding, but they seem like a good idea. 

post #5830 of 10599

Ahh very cool!  Did you get in there with a military spy camera or something? 

post #5831 of 10599
Either x-ray vision or all the "quality time" I've spent tinkering with these things.

Quote:
Originally Posted by rhythmdevils View Post

Ahh very cool!  Did you get in there with a military spy camera or something? 

post #5832 of 10599
Quote:
Originally Posted by rhythmdevils View Post

They seem too short to meet the baffle, but yeah that seems likely.  I need to get mine back on I must have distortion!  Just kidding, but they seem like a good idea. 


Stick 'em back on with rubber cement.
Edited by bluemonkeyflyer - 1/15/12 at 8:29pm
post #5833 of 10599


Hello Steele, I have similar configuration and for more bass keep the black felt over the bass port but I made two hole with my paper punch over the bass vent in the Paxmate and the bass is very good on my T50rp. Also make sure that the cotton do not block the port too much.

Quote:
Originally Posted by steelle View Post

Quote:
Originally Posted by steelle View Post

Just about done with mods on one ear, will throw up pics when I get back on monday.  Mods are based on the RP2:

  • Plasticine inside surrounding the driver, paxmate ontop of the plasticine
  • Fatmat in the back of the cup, paxmate covering the entire back of the cup (covering both the vent and the center post)
  • 4ish Cotton balls torn up and clumped together in the cup.
  • 840 pads

 

Notes:

  • I left the black felt over the vent in the back of the cup
  • Left the felt on both sides on the driver intact (the white felt on the cup-side, and the black felt on the ear-side)
  • I didn't put any sort of reflex dot on the white felt on the driver.
  • Mrspeakers advises 6-7 cotton balls "teased and spread evenly in the cup", but I definitely could not fit that many in and still be able to close it.  I also don't really know what spread evenly is supposed to look like, mine just looks like a one big ball of torn up cotton.

 

So the left ear is completely stock, and the right ear is modded as above, and while I haven't sat down for an extended listen I am already amazed at the clarity and strength of the upper mids and highs.  Very detailed and clear.  The problem is the lack of presence in bass and lower mids.  I'd even go so far as to say the bass is practically nonexistent.  What do I need to do to fix this? I'm also not incredibly impressed with the sound of the 840 pads, although they are much more comfortable, it just makes the sound too distant.  I suppose it's worth stating that I've only listened off my ipod, and as soon as I get some AAA batteries at the store tomorrow morning I'll see if my airhead will have enough juice to make these sound any better (yeah I know I know, I've been trying to save up for a decent dac/amp)


Been thinking and the only thing I can come up with is taking off the felt on the driver and the felt on the vent. Hard for me to believe this will have that much of an impact on bass though...


 

 

post #5834 of 10599
Quote:
Originally Posted by bluemonkeyflyer View Post


Stick 'em back on with rubbe cement.



God I love rubber cement. 

post #5835 of 10599

^ snif snif ? lol

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