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Old 8th May 2012, 11:48 PM   #41
Remlab is offline Remlab  United States
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Quote:
Originally Posted by SEdwards View Post
Here's the example of the T50rps with the back of the cup open - this big 10 dB drop off can be removed by damping. You can actually get the thing flat up to about 10 kHz but that wouldn't be a good match for HRTFs. Hopefully some stuffing can do the same for your tweeters.

Interesting RE: the Monoprice IEMs. I have a friend going to the US in June, I'll probably ask him to bring back some Monoprice cables. Maybe I'll throw in a couple of these.


Click the image to open in full size.
I'm not kidding, these Monoprice iem's sound like they cost at least $100.00!

As far as the Fostex phones go, Here's Tylls measurements. Sure enough, they measure relatively flat like you said(grey trace)
http://www.innerfidelity.com/images/...T50RP2011A.pdf
This is acceptable enough to continue with this project. I'm exited again! Here's another sample of a different T50rp headset..
http://www.innerfidelity.com/images/...T50RP2011B.pdf

Last edited by Remlab; 9th May 2012 at 12:15 AM.
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Old 9th May 2012, 12:11 AM   #42
Remlab is offline Remlab  United States
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At the bottom of this page are several T50rp DIY mods..
Headphone Data Sheet Downloads | InnerFidelity
It looks as if some of them have succeeded in producing a good HRTF curve. This is very encouraging..

Last edited by Remlab; 9th May 2012 at 12:14 AM.
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Old 9th May 2012, 01:00 AM   #43
Remlab is offline Remlab  United States
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Fostex T50rp diaphragm.
http://farm5.static.flickr.com/4066/...69828e23_b.jpg

Last edited by Remlab; 9th May 2012 at 01:03 AM.
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Old 9th May 2012, 01:18 PM   #44
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Here's how the right side of my girlfriend's T50rps are currently tuned. The gain at 1.5 KHz is where my HRTF sets in. This set is not perfectly tuned but sounds very nice with the gently sloping curve.

Check out bluemonkeyflyer's recent posts on HeadFi where he details the measurement setup that we've been using. There's hope yet for your tweeters, I think.


Click the image to open in full size.
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Old 14th May 2012, 01:28 AM   #45
Remlab is offline Remlab  United States
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I am going to order deep neo 3 cups from Gr research,
Neo 3
in an attempt at tuning the back wave. I actually tried the shallow cups with pretty good success. Who'd a thunk... Maybe then I will experiment with teeny tiny "vario-vents" as a fine tuning method.. Hmm..
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Old 22nd May 2012, 06:16 AM   #46
Remlab is offline Remlab  United States
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OK, I just recieved two pair of deep back cups from Danny. The yokes seem to be clearing them enough to where they won't get in the way. I bought some nylon lined nuts that fit the yoke pins perfectly. These will be glued to the sides of the deep cups with superglue. I may make slits in the back of these cups for mini open transmission lines, but first I'm going to try them sealed. I don't have any idea how these headphones will sound, so please, don't purchase anything related to this project until I see how this experiment turns out. You may be wasting your money if you do.

Last edited by Remlab; 22nd May 2012 at 06:23 AM.
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Old 22nd May 2012, 01:24 PM   #47
craigj is offline craigj  United States
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Quote:
Originally Posted by Remlab View Post
I don't have any idea how these headphones will sound, so please, don't purchase anything related to this project until I see how this experiment turns out. You may be wasting your money if you do.
O.K., I guess that remark is aimed directly at me. But gosh darn it, Hurry...I love what you are trying to accomplish and wish I had the guts to chop up headphones like you do.

Meanwhile, back to my omni project (it also utilizes a Neo 3 PDRW).

Thanks,

Craig
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Old 23rd May 2012, 03:47 PM   #48
Remlab is offline Remlab  United States
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The large cups definitely aren't going to work. As far as tuning the diaphragm goes, they're too large. And if I try to fill them, they're too heavy. Listening tests indicate that the small cups with holes drilled in the back will work. The question remains as to how well. It still amazes me how the tiniest little changes to the back area have profound effects on the front area..

Last edited by Remlab; 23rd May 2012 at 03:52 PM.
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Old 24th May 2012, 01:34 PM   #49
craigj is offline craigj  United States
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Seth,

Perhaps I've missed this, when you write "small cups", do you mean the enclosure that is already attached to the Neo3?

Cj
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Old 29th May 2012, 05:38 PM   #50
Remlab is offline Remlab  United States
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Quote:
Originally Posted by craigj View Post
Seth,

Perhaps I've missed this, when you write "small cups", do you mean the enclosure that is already attached to the Neo3?

Cj
Yes.
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