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Stax Sigma wood mesh housing? - Page 4

post #46 of 107
Thread Starter 

I have been enjoying these headphones today. I had a somewhat thin layer of mineral wool but thickened it up some. I bet I get a lot of the Sigma sound.

I might have put too much wear and tear on the drivers. One seems to have slightly more high treble. The good news is I bought a 2nd hand pair of 407's

today. I think I will enjoy the 407's the way they are for a good while but there is a real good chance they are going to turn into 407/Sigmas. I will take more

time to make the pieces as nice as possible and can hopefully avoid a lot of mistakes. Thinking of using a folded piece of 1/4in aluminum to the angle of the

driver to the earpad then the cage around. That would be about as stiff as it could be. It would  be harder because everything did work out so nicely using

a mix with the old Lambda housing.

post #47 of 107

Let us know what you think of the SR-407s, Jay. My Sigmas have a pretty thick layer of mineral wool. I'm glad you are getting there with the sound of the Sigmas.

post #48 of 107

Do let us hear what you think of the 407 and how the sound differs from your built-up Sigma.

post #49 of 107

If it's anything like the 507 I heard here when another headfi-er brought one over to hear my stuff, it will be freakin' excellent. Very nice midrange and improved and more impactful bass compared with the LNS. Not too sure about the highs - not a negative, but would need more time. Hate the appearance of the arc structure - the 407 (if it's the same internally and has the old wide brown cable) should be even better.

post #50 of 107
Thread Starter 

I think something really good is going to come out of this project. I opened the back up again and changed the shape of the insulation and so far I never heard anything sounding like this. Bass is there with the insulation shape.It has more detail and a bounce to it and being open just seems to help everything. They are more efficient than in Sigma configuration but a bass heavy song made one side clip with loud volume. Getting a lot more out of had experience even in mid bass. I know I am not really doing a great job describing and am not no scientist but just going by what I have heard I am  really impressed so far. Now just planning on how I will build them.

post #51 of 107

This could be an interesting material for the wadding.

 

http://www.twaron-angelhair.com

 

Regards Georg

post #52 of 107

do the 407 drivers fit the Sigma? I thought they were a little different.

Jay, I am very impressed with your project.

I thought you had bought a pair of Sigma Pro a while back. Did you sell it?

post #53 of 107
Thread Starter 

Ya I had a pair of Sigma Pro's and disliked them so sold them to another headfier. I didn't give them much of a chance. Even from the start UPS charged me about $200 extra duty to ship them to Canada.

What I remember is the bass had force and no detail and there was not much treble. They didn't really fit nice either. The problem was the insulation because the new buyer cleaned them out and is happy 

with them. I was wondering if the 407 might be different in size. It won't matter to me if they are different because will be making from scratch. The solider the better that is for sure.

 

I tried a new insulation that I got a piece of scrap at work. Its called Tecmat aka needle blanket. Like fine white needles and very soft. It is said to be very good at blocking  sound. Extremely high temperture

 2200 degrees F. I tried some but went back to mineral wool because it seems to do something a lot better for the bass and overall sound. Kind of thinking there is a little bit of magic in the way the mineral

wool.


Edited by jaycalgary - 4/3/11 at 9:46pm
post #54 of 107
Quote:
Originally Posted by gilency View Post

do the 407 drivers fit the Sigma?


Not unless you are willing to glue them together or fashion some holder for them.  The new Lambdas all use an external shell to support the drivers. 

 

post #55 of 107



 

Quote:
Originally Posted by jaycalgary View Post

I think something really good is going to come out of this project. I opened the back up again and changed the shape of the insulation and so far I never heard anything sounding like this. Bass is there with the insulation shape.It has more detail and a bounce to it and being open just seems to help everything. They are more efficient than in Sigma configuration but a bass heavy song made one side clip with loud volume. Getting a lot more out of had experience even in mid bass. I know I am not really doing a great job describing and am not no scientist but just going by what I have heard I am  really impressed so far. Now just planning on how I will build them.



I hope that some experimentation with the mineral wool will providee clues on how to get the best sound from this type of design.  It's a critical part of this design of headphone.

 

I don't have any criticism of the Sigma Pro, but mine was was assembled only a few years ago by Stax in Japan. 

 



Quote:
Originally Posted by jaycalgary View Post

Ya I had a pair of Sigma Pro's and disliked them so sold them to another headfier. I didn't give them much of a chance. Even from the start UPS charged me about $200 extra duty to ship them to Canada.

What I remember is the bass had force and no detail and there was not much treble. They didn't really fit nice either. The problem was the insulation because the new buyer cleaned them out and is happy 

with them. I was wondering if the 407 might be different in size. It won't matter to me if they are different because will be making from scratch. The solider the better that is for sure.

 

I tried a new insulation that I got a piece of scrap at work. Its called Tecmat aka needle blanket. Like fine white needles and very soft. It is said to be very good at blocking  sound. Extremely high temperture

 2200 degrees F. I tried some but went back to mineral wool because it seems to do something a lot better for the bass and overall sound. Kind of thinking there is a little bit of magic in the way the mineral

wool.



 

post #56 of 107
You did an incredible job in recreating the Sigmas and conducting these experiments. Way to go and congrats.
post #57 of 107
Thread Starter 

There is a pair Sigmas for sale here is Canada Says Sigmas but sure look like pro's to me with the brown color. Look very good but the price sure doesn't to me anyway.

http://www.canuckaudiomart.com/details/648948307-stax_sr_sigma_earphones/

 

Funny part is today I bought a Dremel type kit making plans for a new version of diy sigma but this one mostly all billet aluminum with a cage back. I wish I had

access to a machine shop it would be so nice and easy but don't we all. I have 2 a sets of Lambda Sig's at the moment and am thinking I will use the drivers and

cable from one pair for this project. Hopefully wont be considered a vintage vandal if I can put them back. I use mineral wool cut against the grain and perforate it

and and like the open sound. I wish I didn't miss the Calgary meet sure would have liked others to hear them to see if I am on the right track.

post #58 of 107
Thread Starter 

I have a problem and hoping for an opinion. I removed the drivers from a pair of Lambda Signatures but when I started on the 2nd driver I noticed a problem. There is a pin sized

in the back of the driver dust cover. I also see there is a black spot on each side of the stator near 1 pin that is not there on any of my other drivers. Its been a while since I turned

this pair on but I remember thinking there was an imbalance and sounded dull compared to my other Lambda Sig's. Is there anything I can put to seal the hole or has it been too

long anyway? I have 1 more pair I can use but I really didn't want too. It's my beater pair but sound really good. The problem is one drivers grill was dented and dust cover stretched

but is ok. In a sigma it might flap though. Is it better to use the 2 best drivers from both pairs or is it a better match to use both drivers from the beater pair?

 

I spent about 8hrs or so far cutting,filing and sanding aluminum plate into shape. I wanted to bend a single piece of into the "L" shape but the aluminum is too brittle and snapped

on both pieces. Would have work with heat but too late. So I turned it into another idea I was thinking of from the last pair I made. The driver plate in going to be about a half inch

in on the earpad plate and the driver is going to be on the front of the plate. I rounded the corners of the driver plate and they look like monkey ears.I will post some pics when I

am further along.


Edited by jaycalgary - 6/24/11 at 3:34am
post #59 of 107
Thread Starter 

I thought I had a good idea but for a few different reasons it just won't work the way I really want it to. I am trying to bring the driver as close as possible to the earpad and it is close but

not as close as it could be if the baffle is on the outside. Another problem is the driver sticks out too far and maxes out the width of the ark assembly but it could all still work.I think

I will abandon the work so far and start over with the original baffle in front but I do wonder if I would have had an advantage by having it the way I do in the pics.

 

Photo0012.jpg

 

Photo0013.jpg

post #60 of 107

It would be good to see (hear) how variations on the basic Stax Sigma box work.  I would guess that Stax did some experimenting back in the day and didn't start out with that god-awfull  set of  Sigma boxes but went that way because of what they found.  But who knows?  I really wish that Stax would return to this design principle.

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