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.
Stax Sigma - how many owners are left out there? - Page 8
Poll Results: What's your Sigma model?
This is a multiple choice poll
47% of voters (10)Normal Bias 6 Pin
61% of voters (13)Pro Bias 5 Pin
19% of voters (4)404 Modded Pro Bias with original drivers replaced by Lambda's
21 Total Votes
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- 118 Posts. Joined 5/2013
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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.