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I have a question regarding the appearence of the old STAX SR-Lambda Signature drivers (not the headphones). I know about the aspects regarding diaphragm thickness, cable specs and stator spacing, but not the physical differences between the Signature drivers vs. Pro and low bias drivers.

Are the holes in the Signature stators different from the Pro and low bias drivers. Are there any significant physical distintions, by which you can identify the specific driver type?