Scrappersa
Well-known member
- Joined
- Jul 17, 2011
- Messages
- 150
With glued membranes, it's easy to measure the resonant frequency of a capsule membrane because you can take it off the backplate, check it on top of a speaker with a sweep with some salt on top of it or with a measurement mic.
Any ideas how to check the resonance of a membrane on a backplate that is screwed down and cannot be removed? This is a problem that has stumped me for a while.
@ricardo mentioned in some older posts that at Calrec they would apply polarization voltage to the capsule and check the capacitance. I'm not sure how that would work though since the capacitance in each backplate is variable depending on shim height and inconsistencies in the machining/lapping.
I'm wondering if anybody knows of a way to check the tuning of a membrane while it's on the backplate. Or if you have any other techniques for figuring out if a membrane is within an acceptable range once it's screwed down. Even if there is a device like a tonometer or a tension gauge that can let you know if the tension is set within a spec.
Any ideas how to check the resonance of a membrane on a backplate that is screwed down and cannot be removed? This is a problem that has stumped me for a while.
@ricardo mentioned in some older posts that at Calrec they would apply polarization voltage to the capsule and check the capacitance. I'm not sure how that would work though since the capacitance in each backplate is variable depending on shim height and inconsistencies in the machining/lapping.
I'm wondering if anybody knows of a way to check the tuning of a membrane while it's on the backplate. Or if you have any other techniques for figuring out if a membrane is within an acceptable range once it's screwed down. Even if there is a device like a tonometer or a tension gauge that can let you know if the tension is set within a spec.