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Orthodynamic Roundup - Page 1404

post #21046 of 23440

Found some pics of TDS-7 diaphragm
http://baraholka.onliner.by/viewtopic.php?t=2846177

 

Pictures of driver

http://player.ru/album.php?albumid=124

post #21047 of 23440

member nick n caught me skulking around the vintage receiver forum and asked me to post on a T50rp rebuild I had started a while ago.

 

My intent was to completely rebuild the housing in an attempt to angle the drivers. My hope was this would give me a little better soundstage. I had experimented with angled Stax pads in the past and the results were very favorable, if somewhat expensive.

 

I built the cups up from aluminum with the baffle fixed to a hemisphere. Due to the construction I had to use the original driver reversed, i.e. back facing out. Since the front and rear of the driver seemed to be identical this didn't appear to be a problem. I removed the filter paper front and back in order to make them more "symetrical" (this may have been my first mistake). I stuffed the enslosures with some long hair wool I had and wired them up. Well expectation bias and psychoacoustics came heavily into play at this point as I believed what I was hearing was a substantial improvement. Luckily I had purchased a second pair of T50rps as my control group (unmodified). When I switched back to the unmodified T50s they were better, and remained so.smile.gif

 

I futzed with the damping and tried molding the face of the baffle up with museum putty in an attempt to improve the sound but all of my efforts were wasted. I just couldn't get them to sound good. I became so disgusted with the project I haven't touched it in months. I haven't given up totally yet though. I think I need to pull the long hair wool out and replace it with basic fiber glass and attempt to reinstall some type of filter over the front and back of the driver similar to the original.

 

 

 

 


Edited by Vaughn - 2/8/13 at 8:39am
post #21048 of 23440

They look neat (but must be huge on your head). Did you build the shells yourself? or are they from something else?

 

Are there any vents on the cup or is it completely closed? Any baffle holes either?

post #21049 of 23440
Quote:
Originally Posted by Vaughn View Post

 

 

 

 

 

What went wrong with the sound of those? They have a fine space-age look to them.

 

 

Quote:

Originally Posted by Drakkard View Post

TDS-15 seems best both of them in details retrieval, instrument separation, and sense of air, but lacking bass in stock form.

 

I am thinking the bass is quite good / deep in the TDS-15. But those flat stock pads are so extremely uncomfortable - they go inwards in the middle, like a flat tyre.

post #21050 of 23440
Quote:
Originally Posted by Armaegis View Post

They look neat (but must be huge on your head). Did you build the shells yourself? or are they from something else?

 

Are there any vents on the cup or is it completely closed? Any baffle holes either?

 

The shells are actually intended for baking. You can get them in a variety of sizes, in case you want to make a cake that looks like a snowman. There is a vent on the cup, about 5/16" of an inch. I might try sticking a grommet in it as a hole shrinker and see what effect that has on the sound. No holes on the baffle.

post #21051 of 23440

@ DAC,

 

Still trying to suss that out. This is the problem with approaching something like this with less than scientific rigor. I'm not really sure what point I should backtrack to and start again.

 

I think a large part of it is I should not have removed the filter screens attached to the front and back of the driver. Now I'm left with trying to fabricate a reasonable facsimile. Also, I'm sure I overstuffed the chambers. 

post #21052 of 23440
Quote:
Originally Posted by DefectiveAudioComponent View Post

I am thinking the bass is quite good / deep in the TDS-15. But those flat stock pads are so extremely uncomfortable - they go inwards in the middle, like a flat tyre.

 

+1 my exact same impressions

post #21053 of 23440
Quote:
Originally Posted by Vaughn View Post

 

The shells are actually intended for baking. You can get them in a variety of sizes, in case you want to make a cake that looks like a snowman. There is a vent on the cup, about 5/16" of an inch. I might try sticking a grommet in it as a hole shrinker and see what effect that has on the sound. No holes on the baffle.

 

Hah, I was thinking it was from a lamp or something. Try adding a tiny pinhole to the baffle.

 

How does it currently sound? (or how does it compare to stock?) I've done my fair share of transplants so I'm curious. 

post #21054 of 23440

Ha Ha (and I am laughing with you not at you for sure:). I suspect the rub is in the hemispherical shells you have used. I had (am having if I ever get round to working on them again) a very similar experience with a pair of sawafuji drivers in skullcandy hesh (hey I paid 4 bucks for em and they aint worth that, so for parts....) which have a hemi enclosure. While it seemed a great idea at the time, I believe the hemisperical enclosure reflects way too much even when damped and is resulting in nodal lines removing some of the frequencies. I had thought of A) cutting the rear of the hemi off and putting a flat plate over the hole or B) using some kick ass ceramic putty to create a deep and irregular surface in the shell. After thinkng it over, it pretty much would be a more economical venture to haul out the router and dremel and just make a different enclosure out of wood. As for the hesh...well... 4 buck aint bad for a headband, is it?

 

My enligtened scientific conclusion. Hemi, good for internal combustion engine, bad for orthos:)
 

post #21055 of 23440
Quote:
Originally Posted by Armaegis View Post

 

Hah, I was thinking it was from a lamp or something. Try adding a tiny pinhole to the baffle.

 

How does it currently sound? (or how does it compare to stock?) I've done my fair share of transplants so I'm curious. 

 

I will try the pinhole for sure as it is easy to undo. See below for the sound

Quote:
Originally Posted by Hutnicks View Post

Ha Ha (and I am laughing with you not at you for sure:). I suspect the rub is in the hemispherical shells you have used. I had (am having if I ever get round to working on them again) a very similar experience with a pair of sawafuji drivers in skullcandy hesh (hey I paid 4 bucks for em and they aint worth that, so for parts....) which have a hemi enclosure. While it seemed a great idea at the time, I believe the hemisperical enclosure reflects way too much even when damped and is resulting in nodal lines removing some of the frequencies. I had thought of A) cutting the rear of the hemi off and putting a flat plate over the hole or B) using some kick ass ceramic putty to create a deep and irregular surface in the shell. After thinkng it over, it pretty much would be a more economical venture to haul out the router and dremel and just make a different enclosure out of wood. As for the hesh...well... 4 buck aint bad for a headband, is it?

 

My enligtened scientific conclusion. Hemi, good for internal combustion engine, bad for orthos:)
 

 

I think you are right about this. The entire midbass area seems to be MIA. There is plenty of deep bass but the sound is completely hollow. I think I'll make a cheap and cheerful diffusor to go in the back of the cup. Maybe something like the energy dome helmets Devo wore, except made out of closed cell Creatology foam from Michaels. 

 

 


Edited by Vaughn - 2/8/13 at 3:42pm
post #21056 of 23440
Quote:
Originally Posted by Vaughn View Post

 

I will try the pinhole for sure as it is easy to undo. See below for the sound

 

I think you are right about this. The entire midbass area seems to be MIA. There is plenty of deep bass but the sound is completely hollow. I think I'll make a cheap and cheerful diffusor to go in the back of the cup. Maybe something like the energy dome helmets Devo wore, except made out of closed cell Creatology foam from Michaels. 

 

 


I found that everything seemed flat it was like just about every other frequency was blocked until you got up into the high wavelengths. Rather sounded more  like very good split mono insted of stereo.

 You can probably pick up  those energy domes cheap now, That'll be the next trend after Dre's beats , 50 Cent and Ludacris.efforts to murder the sound perception of our youth. Have to admit, a Devo desinged ortho or electostat could potentially be awesome, you should pitch em on that one:)

post #21057 of 23440

hi any idea to recable HP-3? any nice cable to suit it? smily_headphones1.gif

post #21058 of 23440
Quote:
Originally Posted by yhong26 View Post

hi any idea to recable HP-3? any nice cable to suit it? smily_headphones1.gif

 

For a monent there, i tought you were referring to Grados HP-3, sorry, carry on popcorn.gif

post #21059 of 23440
Quote:
Originally Posted by nick n View Post

oh the YH-1000 dropped in price then bigsmile_face.gif

 

I wonder if there is corrosion on the driver traces in this one.

 

Kalbee i would be curious to see their attachment method for the aftermarket headband whenever you get around to it.

 

 

Punched through. How? I have no clue! which is why I was unsure on it being a DIY.

 

I would imagine the only easy way to do it would be to remove metallic part from the cup, insert it backwards into the headband, and fix it to the cup again. But when I took everything apart I couldn't see any easy or proper way to removing the ball joint without minor destruction.

The other side of the headband is broken on the side of the punched hole; you can imagine how little material there is there considering how thin the headband is at that point. It is currently being held by electric tape, and it's working but temporarily.

 

Seeing as it isn't adjustable in any way, and that they can rotate freely indefinitely (kind of like Grados but on a different axis), I'm lucky it fits just perfect on my head. Though the cups are then highly angled forward.

post #21060 of 23440
Quote:
Originally Posted by Vaughn View Post

 

I think you are right about this. The entire midbass area seems to be MIA. There is plenty of deep bass but the sound is completely hollow. I think I'll make a cheap and cheerful diffusor to go in the back of the cup. Maybe something like the energy dome helmets Devo wore, except made out of closed cell Creatology foam from Michaels. 

 

 

 

 

Probably the first thing I do for any ortho damping is put some acoustic foam behind the driver. Anything to break up the immediate reflection. Where is the cup vent located? Perhaps instead of one big one, it'd be better with several smaller ones. This would also make it easier to tune and experiment. I see a lot of closed headphones these days with four small holes hidden somewhere along the cup. 

 

When you say the midbass is missing, can you say roughly what frequency it falls at? I have a Nuforce HP-800 I reviewed recently which has a big hollow aluminum cup and it has some crazy bass, but drops quite strongly at 400Hz. 


Edited by Armaegis - 2/8/13 at 11:13pm
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