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Author Topic: Fostex T50RP Paradox, LCD-2, LCD-3 Frequency Response  (Read 29916 times)

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Marvey

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Fostex T50RP Paradox, LCD-2, LCD-3 Frequency Response
« on: November 29, 2011, 07:21:43 AM »

By special request. Fostex T50RP FR with comparisons to another T50RP mod and LCD2 and LCD3. I didn’t realize the LCD3 is even more shelved than an LCD2. I thought so at the meet, but I didn't want to believe it. This is why measurements are always good. They don’t let our wishful thinking get the better of us.

Fostex T50RP Paradox frequency response


Mystery Fostex T50RP modified


Audeze LCD-2 revision 1 frequency response (known good pair)


Audeze LCD-3 frequency response
« Last Edit: August 10, 2013, 05:43:44 PM by purrin »
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timjthomas

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Re: Fostex T50RP Paradox frequency response and comparisons
« Reply #1 on: November 29, 2011, 11:15:05 AM »

Very interesting (or should I say revealing) graphs!!
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rhythmdevils

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Re: Fostex T50RP Paradox frequency response and comparisons
« Reply #2 on: November 29, 2011, 09:45:10 PM »

So with your compensation, are you aiming for the ideal to be a flat line like it is with speakers?  As opposed to the Headroom and Innerfidelity graphs that have compensation, but still need to be interpreted (they're not actually "zeroed out" with the human ear and ideal is still not flat)

The reason I ask is because LFF says his T50rp's are really flat, and I've never seen an HP graph as flat as those.  Other graphs would show "ideal looking dips and peaks"
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LFF

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Re: Fostex T50RP Paradox frequency response and comparisons
« Reply #3 on: November 29, 2011, 11:06:00 PM »

So with your compensation, are you aiming for the ideal to be a flat line like it is with speakers?  As opposed to the Headroom and Innerfidelity graphs that have compensation, but still need to be interpreted (they're not actually "zeroed out" with the human ear and ideal is still not flat)

The reason I ask is because LFF says his T50rp's are really flat, and I've never seen an HP graph as flat as those.  Other graphs would show "ideal looking dips and peaks"

Good question.

That's how they sound to me....flat.

There are going to be 10 pairs in the wild after Friday.  :)  Hopefully some show up at meets.
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rhythmdevils

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Re: Fostex T50RP Paradox frequency response and comparisons
« Reply #4 on: November 30, 2011, 12:25:49 AM »

Cool, is someone going into production?  Do you need beta testers?  :-) 

I drilled holes into the back of my T50rp (like I do with all my orthos) and it produced very strange effect.  FR was fine, but the imaging got really wonky.  not something I've experienced with any of the vintage orthos I've drilled.  I think these drivers were designed to have some resistance in the enclosure behind them (small damped vent).  I'll have to post pics in the big thread.  But I just ordered another stock pair and I'll be doing my own thing probably with no clay or akasa. 
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LFF

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Re: Fostex T50RP Paradox frequency response and comparisons
« Reply #5 on: November 30, 2011, 12:41:34 AM »

Cool, is someone going into production?  Do you need beta testers?  :-) 

I drilled holes into the back of my T50rp (like I do with all my orthos) and it produced very strange effect.  FR was fine, but the imaging got really wonky.  not something I've experienced with any of the vintage orthos I've drilled.  I think these drivers were designed to have some resistance in the enclosure behind them (small damped vent).  I'll have to post pics in the big thread.  But I just ordered another stock pair and I'll be doing my own thing probably with no clay or akasa.

Good luck!.... ;)
« Last Edit: November 30, 2011, 02:58:52 AM by LFF »
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abhinit90

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Re: Fostex T50RP Paradox frequency response and comparisons
« Reply #6 on: November 30, 2011, 02:19:23 PM »

Great, these graphs show a lot, I'm particularly amazed by the flatness of LFF's mod.
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timjthomas

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Re: Fostex T50RP Paradox frequency response and comparisons
« Reply #7 on: November 30, 2011, 08:26:00 PM »

So, how do the frequency plots "differ" from the waterfall plots?  Are they used together or is one "more useful" than the other?

-Tim
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Marvey

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Re: Fostex T50RP Paradox frequency response and comparisons
« Reply #8 on: December 01, 2011, 12:01:40 AM »

FR graphs with CSDs provide us with a lot of info. I'll crank out more stuff tonight. Think of the CSDs as sort of an FR over time...

The third graph (or sets of graphs) I would like to produce would be full spectrum distortion graphs at varying frequencies or sets of frequencies. These are a major pain to produce though. You might see a few here and there though.
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Marvey

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Re: Fostex T50RP Paradox frequency response and comparisons
« Reply #9 on: December 01, 2011, 12:29:30 AM »

So with your compensation, are you aiming for the ideal to be a flat line like it is with speakers?  As opposed to the Headroom and Innerfidelity graphs that have compensation, but still need to be interpreted (they're not actually "zeroed out" with the human ear and ideal is still not flat)

The reason I ask is because LFF says his T50rp's are really flat, and I've never seen an HP graph as flat as those.  Other graphs would show "ideal looking dips and peaks"

Yes - these are my initial calibrations based on the massive amount of data I've collected from both solid plate and open measurements. Some tweaks have been applied in comparing with my DIY near-field monitors which measure flat at the listening position. I will post more later on this.

I've held off from posting FR graphs for the longest time, but I figure the the stuff I have doesn't have a lot the irregularities that are out there and more data points wouldn't hurt.
« Last Edit: December 01, 2011, 01:11:11 AM by purrin »
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