k brown
Well-known member
My hunch is mostly sales gimmick.
WHAT THE HECK IS THIS????
Why on earth would anybody make such membranes? Errr ... to emphasise certain areas and to suppress partial resonances?
Not only that, but any capacitance due to leads and PCB traces, as well as FET's gate capacitance.Or perhaps ... wait a minute, I have to get my thoughts around that! ... and I have never before heard the term "parasitic capacitance" ... does that mean: at the edges (and with Neumann style in the middle as well) the diaphragm does hardly move at all and can thus be seen as a constant capacity?
That's exctly it.A capacity, further more, that has to be viewed as parallel to the generator and thus acting as a load?
WHAT THE HECK IS THIS????
Why on earth would anybody make such membranes? Errr ... to emphasise certain areas and to suppress partial resonances?
Or perhaps ... wait a minute, I have to get my thoughts around that! ... and I have never before heard the term "parasitic capacitance" ... does that mean: at the edges (and with Neumann style in the middle as well) the diaphragm does hardly move at all and can thus be seen as a constant capacity? A capacity, further more, that has to be viewed as parallel to the generator and thus acting as a load?
@ Kingkorg: Is that what you mean by parasitic capacitance? - Interesting thought!
Best from Bremen!
Wulf
Nice illustrations here - even for a rectangular membrane. Of course irl the modes are more irregular.i was skeptical, but metallization area does change the sound, and it can be significant, just not for the reason JZ thinks it does. Classic example of someone inventing something real by accident. telewulf is right, it's related to which areas of capacitance contribute to the final signal and nothing to do with weight at all as claimed by JZ. It's all about which waves at which frequencies oscillate the diaphragm at the places that are metalized. the diaphragm doesn't pump forward and backward like a speaker, it's more like an big set of oscillating standing waves, and different frequencies consistently are represented on different areas of the diaphragm. telewulf's intuition is quite good, he figured it out faster than its own inventor did, lol.
Wow! Thank you all for that wonderful thought-fodder ... you really sparked my brain!
The whole time we have this passive capacitance of static diaphragm in parallel
Then you also reduce the "swing" of the capacitance the capsule is able to produce. Which is why SDC have in general higher noise. No free lunch.But then again: If you want to reduce the capacitance of a large diaphragm to that of a small diaphragm, you could just take a small diaphargm!
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