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Fostex TH900 Impressions & Discussion Thread - Page 212

post #3166 of 4414
1/22/13 at 6:14pm
Quote:
Originally Posted by bmichels View Post

Does'n this invite you to re-wire the TH-900 Balanced ? :-) Has someone tried ?

I already have.
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post #3167 of 4414
1/22/13 at 9:45pm
I accidentally put TH900 on the maximum volume on DACmini can this damage them or I shouldn't worry that much ? (I simply love them)
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post #3168 of 4414
1/22/13 at 9:59pm
Quote:
Originally Posted by IV10K View Post

I accidentally put TH900 on the maximum volume on DACmini can this damage them or I shouldn't worry that much ? (I simply love them)

 

For how long? The TH900 are rather sensitive headphones, so theoretically they're more prone to damage by extremely high volume...

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post #3169 of 4414
1/22/13 at 10:03pm
Quote:
Originally Posted by Magick Man View Post

I already have.
+1
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post #3170 of 4414
1/23/13 at 12:01am
Quote:
Originally Posted by Maxvla View Post
I not only think it, there are measurements to back up my thinking. Roll your eyes elsewhere.

766554

958ed40c_HD800.txt.jpeg

 

Um, you know that what you posted are CSD plots, right? CSD plots don't show impulse response, which is what I was referring to. And of course the open HD800 has a better CSD plot than the closed TH900.


Edited by Asr - 1/23/13 at 12:03am
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post #3171 of 4414
1/23/13 at 12:14am
Is there any explanation of how they measured it - link?
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post #3172 of 4414
1/23/13 at 12:20am
Quote:
Cumulative spectral decay (CSD) or waterfall plots measure energy content over time across all frequencies based on a "sound burst" that excites all frequencies. They are sort of like a FR over time (technically not really as they measure energy throughout the band in successively smaller windows over time.) These plots are a good tool to "see" driver ringing or resonances (seen as ridges), which typically sounds bad (piercing, glare, shoutyness, etc.); and how fast and cleanly the driver decays (speed and extraction of low level information.)

For a perfect or near-perfect response, the decay should be immediate. We first see a wall (meaning all frequencies are excited) at the beginning. The next few fractions of a millisecond, the wall collapses into silence (meaning the driver is no longer vibrating or sound waves are no longer bouncing around inside the headphone enclosures.) The back wall at time = 0 is basically an uncompensated frequency response. Success plots over time move toward us.

So yes, it has to do with the speed of the driver among other things.
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post #3173 of 4414
1/23/13 at 12:27am
But if you want impulse we can do that too.

HD800


TH900
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post #3174 of 4414
1/23/13 at 12:38am
Maxvla, did you also make frequency measurements of an old Hd800 and a new one.
There should be a big difference.
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post #3175 of 4414
1/23/13 at 12:47am
I don't do the measurements. Purrin does.

Here are a few more HD800s.

Anaxilus (unsure serial #):



Headroom's demo (serial #500ish):



Here's mine (#16021)



Among the bunch they decided mine sounded the best of the stock form HD800s they had on hand.
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post #3176 of 4414
1/23/13 at 1:39am

Great, thank you!

 

Is there any specific reason why the older one

http://cdn.head-fi.org/9/95/958ed40c_HD800.txt.jpeg

is starting below 1k and the last 3 didn't?

 

I also think (like ASR), that the TH900 has a different chart because it's closed model.

 

Just saw your signature by changing to desktop mode. (i have also a BHA-1)

Do you prefer Gungnir or BHA-1 ?

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post #3177 of 4414
1/23/13 at 1:49am

(just found the link: http://www.head-fi.org/t/566929/headphone-csd-waterfall-plots)

 

I am not sure, if the chart tells everything, as the 007 might be a nice can, but the chart is telling a different story.

http://www.geocities.jp/ryumatsuba/SR-007SRM-717-Accumulate.gif

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post #3178 of 4414
1/23/13 at 1:49am
Just the settings at the time for that particular test, I guess.

Gungnir is my DAC, BHA-1 is my amp, so I like both of them, together!

FWIW I also briefly owned a SR-007 and sold it due to being sensitive to those treble resonances. They were somewhat fatiguing me and I had no idea why since they were so well regarded. Then I saw the graphs and figured it out.
Edited by Maxvla - 1/23/13 at 1:51am
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post #3179 of 4414
1/23/13 at 1:54am
Quote:
Originally Posted by Magick Man View Post

I already have.

Balanced TH900, And .... ? Does this bring a real improvement on the sound or sound stage ? Isn't the advantage of going Balanced reduce With very efficient headphone like the TH900 ?

In other Words: I own à RedWine Audio amp With booth SE AND Balanced outputs. Should i rewire my TH900 Balanced ? Will i hear à différence ? :-)

Thanks

Aside Question Magic Man: what câbling have you used ? Is Lawron's Queen cooper cabling Recommended With the TH900 ou do you recommand another câble ?
Edited by bmichels - 1/23/13 at 5:38am
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post #3180 of 4414
1/23/13 at 3:11am
Quote:
Originally Posted by songmic View Post

 

For how long? The TH900 are rather sensitive headphones, so theoretically they're more prone to damage by extremely high volume...

 

 

Few seconds only..

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