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Author Topic: Fostex T50RP Stock Frequency Response and CSD Waterfall Plots  (Read 13931 times)

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Marvey

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Fostex T50RP Stock Frequency Response and CSD Waterfall Plots
« on: December 09, 2011, 07:07:15 PM »

Fostex T50RP Stock Frequency Response and CSD Waterfall Plots
CSDs very clean. Check out Paradox mods which clean up the treble.
« Last Edit: June 21, 2012, 06:59:38 AM by purrin »
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rhythmdevils

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Re: Fostex T50RP Stock Frequency Response and CSD Waterfall Plots
« Reply #1 on: December 29, 2011, 07:11:18 PM »

It's strange that these measure so well stock because I thought they sounded pretty resonant.  But maybe it's because it's not coming from the driver as much as the enclosure, which doesn't show up in these plots as much?  Not sure why that would be though...
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Marvey

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Re: Fostex T50RP Stock Frequency Response and CSD Waterfall Plots
« Reply #2 on: December 29, 2011, 08:00:19 PM »

It's strange that these measure so well stock because I thought they sounded pretty resonant.  But maybe it's because it's not coming from the driver as much as the enclosure, which doesn't show up in these plots as much?  Not sure why that would be though...

It's the wavey wave patterns at 1k. Definitely an enclosure issue. Compare with the Paradox. Although it's hard to see because I need to extend more to 6ms.
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rhythmdevils

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Re: Fostex T50RP Stock Frequency Response and CSD Waterfall Plots
« Reply #3 on: December 30, 2011, 12:52:57 AM »

It seems like all your plots show broad, smooth looking ringing starting at about 1khz.  I figured it was more the testing method than the headphone, and your plots are meant for higher frequencies than that. 

But maybe what's happening is that the T50rp is a much cleaner driver to begin with than almost all other drivers, and the stock driver is actually fairly nicely damped, so all the added junk here, while not much compared to other phones, is coming from the cups, which sounds different than the driver ringing other phones have as well?
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RexAeterna

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Re: Fostex T50RP Stock Frequency Response and CSD Waterfall Plots
« Reply #4 on: January 03, 2012, 12:11:11 PM »

i think the problem is mainly the pads. they're so thin it touches your ears and has no seal whatsoever. just changing them alone will be an improvement with the fostex. they actually sound nice with just pad replacement alone and very listenable. yea there is still issues within the cup region but will be much less noticeable due to driver being farther from the ears. i actually listened to mine for while and liked it when i just swap the pads with pair of akg 240 pads alone and stuffed them a little before i even bothered opening them up.

i wonder how the fostex driver will do in a completely open design cup. i had diagrams and schematics drawn out before from all the ideas i had written down that i used studying many open designs and how driver would react using my imagination,picturing the soundwaves in my head backfiring and reflecting back inside the earcup. thing is i don't have any wood working skills or metal working skills. all i know how to do is solder and drill holes. basic stuff basically, so all i can do is use my imagination on ''what it can be.'' or ''possibilities'' and so forth.
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donunus

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Re: Fostex T50RP Stock Frequency Response and CSD Waterfall Plots
« Reply #5 on: July 26, 2012, 04:21:50 AM »

So can someone describe the differences in sound between say... fa-003 pads vs shure 840 pads vs akg pads on these cans? Measurements using different pads and the cans/enclosure being barebones stock would be awesome!
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frenchbat

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Re: Fostex T50RP Stock Frequency Response and CSD Waterfall Plots
« Reply #6 on: July 26, 2012, 04:47:35 AM »

Do you mean something like this ? : http://www.head-fi.org/t/618659/fostex-t50rp-incremental-mods-and-measurements

So can someone describe the differences in sound between say... fa-003 pads vs shure 840 pads vs akg pads on these cans? Measurements using different pads and the cans/enclosure being barebones stock would be awesome!
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donunus

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Re: Fostex T50RP Stock Frequency Response and CSD Waterfall Plots
« Reply #7 on: July 26, 2012, 05:08:08 AM »

Thats a great link. Thanks! but maybe some csd plots would be nice too along with some listening notes. It doesn't have to be as detailed as that thread with all the mods. The more important thing would be just listening notes/impressions of all the pads compared on the cans without any other mods done to them at all. A basic beginners guide so to speak before getting into the internal modding.
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Dyaems

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Re: Fostex T50RP Stock Frequency Response and CSD Waterfall Plots
« Reply #8 on: July 26, 2012, 05:30:41 AM »

you can start reading this thread then :P

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

i think most people who want to mod the t50rp started reading here, with an exception to the wiki made
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donunus

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Re: Fostex T50RP Stock Frequency Response and CSD Waterfall Plots
« Reply #9 on: July 26, 2012, 06:00:00 AM »

I think only purrin can do a csd plot of all the pads compared on a stock fostex :)
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