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Stax Sigma - how many owners are left out there?
May 20, 2014 at 9:07 AM Post #106 of 127
You can use any Lambda ear pads - they fit, but they don't allow the ear speakers to sit at exactly the same angle to your head as using the Sigma pads, as the Sigma pads aren't undulating. It didn't seem to make a great deal of difference. The angles Lambda ear pads fitted my head a little better than the Sigma, pads, although there wasn't a great deal of difference.
 
May 20, 2014 at 11:33 AM Post #107 of 127
The pads on my sigma are really flat black pads. Not sure if they are the original pads or not.
 
May 21, 2014 at 3:52 AM Post #108 of 127
The pad of a Sigma is a few mm shorter than those in a Lambda (at least the current generation one).
 
It might cause you some problem with double sided tape provided, but otherwise it should fit.
 
May 22, 2014 at 6:10 AM Post #109 of 127
Hi All,
 
 
Quote:
davidsh said:
The pads on my sigma are really flat black pads. Not sure if they are the original pads or not.
Click to expand...

 
They are certainly very flat because there are old.
So, they must be certainly original : ) 
 
Change the ear pad can  maybe improve the bass because may be the earpad would stick better to your ear, but this is not certain.
 
May 23, 2014 at 9:50 PM Post #110 of 127
davidsh said:
The pads on my sigma are really flat black pads. Not sure if they are the original pads or not.
Click to expand...

That sounds about right - no contouring as per the Lambda pads.
 
Jul 4, 2017 at 6:26 AM Post #111 of 127
Maybe I'm crazy but I've got Sigmas today... Almost for 1400USD :) But they are in mint condition in original pack and still in plastic bag. As I can see serial is: #05785 but they are looks like Normal Bias in my opinion (grill color, stand and pack are the same that I saw previously with normal bias versions). Am I wrong?
Here are some of photos:
Sigma_1.jpg Sigma_2.jpg Sigma_3.jpg Sigma_4.jpg

So what do you think? Am I nuts? :)
 
Jul 4, 2017 at 1:33 PM Post #112 of 127
twinge said:
Maybe I'm crazy but I've got Sigmas today... Almost for 1400USD :) But they are in mint condition in original pack and still in plastic bag. As I can see serial is: #05785 but they are looks like Normal Bias in my opinion (grill color, stand and pack are the same that I saw previously with normal bias versions). Am I wrong?
Here are some of photos:


So what do you think? Am I nuts? :)
Click to expand...

It's very simple. If the plug has 6 prongs it is normal bias, if it has 5 prongs it's pro bias.
 
Jul 4, 2017 at 2:08 PM Post #113 of 127
I think this is 2-nd version of Normal Bias from 1987 because serial number is big and it still have a grey grill (Pro bias had a black grills).

Update:
Seller wrote to me that it's 6-pin version with flat black cable. So it's definitely 1987 late version!

As I know that version had wider freq response than previous?
 
Last edited:
Jul 5, 2017 at 9:03 AM Post #114 of 127
Hi I own stax sigma normal bias serial 5241, which is in good condition. It has the SRD-7sbmkii adaptor to go with it. I was wondering if the adaptor was detrimental to the sound, given the simplicity of its circuits. Not that I'm unhappy with the sound that the Affordable Valve Company's Class A EL34 Valve Amplifier makes when used as amp with it. The speed and dynamics is so much better than the stax srs-007 ii set and the vocals something else. Not the best sound out there but it has its uniqueness that I don't want to lose.
 
Sep 25, 2017 at 1:24 PM Post #115 of 127
I have an Woo WEE energizer with simple single-ended amp on 6L6 output tubes (only 8 watt output). Normal Bias Sigmas works near perfectly with this combo!

And I have a question: now I have a second pair of SR-Sigma Normal bias and I have two options:
1) To swap drivers from Airbow SC-1 into Sigmas
2) To swap drivers from new SR-L700 into Sigmas

I love the sound stage of Sigmas and want ta make some kind of "Top-End" version of them...

Any suggestions?
Thanks!
 
Sep 25, 2017 at 5:57 PM Post #116 of 127
Don't think a L700 element will fit. The Last series elements all are in a rectangular shaped self contained package with the dust filter, which is different to the previous elements.
 
Sep 26, 2017 at 5:52 AM Post #117 of 127
Actually I think this is a not a big problem. I have a precise milling machine so I can make an adapted or cut "package" edges to fit. Only I'm nervous about is depth of L700 drivers package. But I know that someone fits SR-507 drivers into Sigmas cups!
 
Dec 30, 2017 at 3:24 PM Post #118 of 127
Seeing all these posts, it makes me very thankful that I am lucky enough to own a NB Sigma in working condition. These being such unique headphones that are no longer in production, it's sad to see time march on and the supply get more and more limited. I really would like to see Stax revisit the Sigma--however unlikely--and incorporate what they have learned from subsequent designs. Until that day comes, I will take care of my Sigmas as best I can and keep a look out for the Pro version, which I would like to try.
 
Jun 9, 2022 at 5:36 AM Post #120 of 127
New owner of sigma pro. Sounded muffled at first but culprit was mineral wool covering part of driver. After resorting wool, sound was still uneven (too bassy with rolled off highs). However, they respond very well to EQ (increased sub bass and treble, decreased mid bass) and now sound is very balanced with huge sound images and liquid mids. Not as detailed as modern stax but perhaps more musical. Its 2am and cant stop listening!
 
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