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Just listened to some Fostex T50RPs today... WOW! - Page 682

post #10216 of 10601
Quote:
Originally Posted by Armaegis View Post

Could it maybe be pad spacing? or driver mismatch?

 

I've seen that a few times.  etysmile.gif

post #10217 of 10601
Quote:
Originally Posted by mrspeakers View Post

You can always put an inline resistor in the "+" lead of the channel with more output.  To reduce the gain by about 2dB, just buy a few 1/4 watt resistors (make sure they're non inductive).  If it's really about a 2dB error across the spectrum, adding an inline resistor between 8.2 and 15 ohm should do the trick.  If your driver is exactly 50 ohms a 12 ohm resistor should do as a first test, and adjust and replace as needed.  I've found the Fostex drivers can vary, I've seen 48 and 57 ohms, so a few trials may be needed (especially if your 2dBis a swag).

 

A more accurate way (assuming you have a multimeter) is to get a variable resistor and trim it until it sounds balanced, then measure the resistor and replace it with a quality non inductive network of resistors giving the same value...


Hey there Speakers. Have you ever thought of creating a plug with two slots to insert resistors into? It would be a cheap enough item to create and being able to play with impedence would most likely prove irresistable to the community.wink.gif

post #10218 of 10601
Quote:
Originally Posted by mrspeakers View Post

 

I've seen that a few times.  etysmile.gif

 

 

Dan,

 

Based on all your time spent modding so many pairs of Fostex, have you seen evidence of sound quality being vastly different between different pairs of T50RPs?

post #10219 of 10601

In my experience, driver mismatch has a strong effect on the perception of sound quality. Possibly moreso than overall frequency response (within reason). 

post #10220 of 10601
Quote:
Originally Posted by PhaedraCorruption View Post

Dan,

 

Based on all your time spent modding so many pairs of Fostex, have you seen evidence of sound quality being vastly different between different pairs of T50RPs?

 

Yes.  We have a target sound/response, the majority of units are right there first pass, but some take quite a few passes to make the curve, and a some never do.  Channel mismatch isn't too common once you rule out the easily cleaned oxidation on the cables... 

post #10221 of 10601
Quote:
Originally Posted by Armaegis View Post

In my experience, driver mismatch has a strong effect on the perception of sound quality. Possibly moreso than overall frequency response (within reason). 

 

Yeah.  That's much harder to address than a phone that's more or less efficient than usual but otherwise has a similar response. 

post #10222 of 10601
Quote:
Originally Posted by Hutnicks View Post


Hey there Speakers. Have you ever thought of creating a plug with two slots to insert resistors into? It would be a cheap enough item to create and being able to play with impedence would most likely prove irresistable to the community.wink.gif

 

Maybe sometime... :-)  Irresistorable is hard to resist.

post #10223 of 10601
Quote:
Originally Posted by mrspeakers View Post

 

Maybe sometime... :-)  Irresistorable is hard to resist.


Now that's almost sounding like a product namebiggrin.gif

post #10224 of 10601

hey guys i'm planning to get a pair of t50rp's and was wondering how should I mod it. My budget is only 200USD including the headphones so i'm getting them from ebay for about 140USD including shipping to my country Malaysia. So I have leeway of 60USD to do mods any suggestions?

post #10225 of 10601

The biggest (and most costly) change is slapping some Shure 840 pads on there. After that, cotton balls or other random stuff to put in the cups, but really the pads make the biggest difference. That mostly brings the bass balance up (as well as better comfort). The rest is mostly fine tuning. 

post #10226 of 10601

On top of that if you can get some audio dampening foam (paxmate) and some clay (plasticine) to stuff into the cups that will help as well.  I think out of all the modding materials excluding the pads the dynamat and the paxmate is going to be the most expensive.  You can get a small amount of dynamat though at a local car shop that puts speakers into cars.  other then that everything else is very cheap and easily found at a crafts store.  As for what mod to do.  If you have all the stuff just have some fun and try different ones out and see which one sounds the best to you.  Happy modding beyersmile.png

post #10227 of 10601

alright thanks guys from the graphs i've seen from the incremental mods I think the rock wool+840 pads seem to make a good combo. Less rolled off bass and highs.

post #10228 of 10601

Well here check this out this has a lot of different mods you can check out.  http://www.head-fi.org/a/fostex-t50rp-modification-summary-links-wiki  Out of all of them I would suggest you look at bluemonkeyflyer's mods.  (BMF)

post #10229 of 10601

So uh.. I might be getting a job at a car upholstery place. Keep your eyes open for some custom pads by me.. I'm likely to make some headbands too :)

For me the next step in the modding process was always creating new pads. The Shure's are an improvement on stock.. but I feel they really hold the headphone back overall. Especially when it comes to the midrange.

My idea is a relatively flat pad, with no large open areas for the pads to "echo" and otherwise screw with the sound. Anybody know of any headphones that come with a pad like this? Picture a flat donut for an idea of what I'm thinking.. Or maybe even something kind of like a grado Bowl. Maybe I'll draw some pictures.

post #10230 of 10601

Flat donut?... random ones that come to mind: AKG K181, Pioneer HDJ-1500

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