Good day! Can anybody tell me differences between this to amps? Actually I have SRM-1 (not MK2) and it sounds quite good for me! Thanks!

Yes! I have one NOS/boxed with 05785 serial, the second one with 04263 serial are for experiments!

No. They had Normal Bias drivers and I wanted to try them with Pro bias drivers.

Hi! I wanted to put L700 drivers into Sigma! But now I'm not sure. I've just finished installation of AIRBOW SC-1 drivers and cable at one of my Sigma headphones and I'm not sure now that I will repeat this procedure with L700...

Good day! Can anybody tell me a size (dimensions) of STAX L700 drivers? I'm just figuring is it possible to fit them into STAX Sigma housing instead stock normal bias drivers. BTW: cutting (milling) is possible. Thank you!

Good day everyone! Somewhere I saw an article about an experience of swapping drivers from STAX Lambda 507 to Sigma housing. Anybody know anything about it? I didn't saw any pictures or description of the process and actually I lost link to that topic... Can anyone help me with that? Search on...

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!

Can someone share an experience of upgrading Sigmas? I have two options: swap drivers to SC-1 or to L700 on one of my old Normal Bias Sigma. I love the sound stage of Sigmas but I want more :) Any suggestions? Thanks!

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...

Good day everyone! I'm planing to swap L700 drivers into my old Sigmas. I love the sound-stage of Sigmas. But I don't know will drivers from L700 fit to them or not. Anyone have such experience?

Unfortunately in Canadian office they have NO ear-pads for Sigmas... Maybe someone know another way to get them? Thanks!

Thank you! I will try!

Nobody knows? :(

Just got my Sigmas but ear-pads foam (not damping wool) fall to pieces when I get headphones from package. Yes they were still in original package with papers and warranty documents :) So I want to repair them with original parts. I found on forum few topics that pointing to USA STAX site but...

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...