LDC capsule self-noise?
« on: January 04, 2019, 10:07:27 AM »
So, looking again at those AliExpress cheap LDC capsules, I noticed they state an equivalent noise of 15dBA.

Does anyone know what kinds of self noise a capsule itself introduces? I can't believe these capsules can be that noisy...

For reference, the entire Rode NT1-A mic ( praised for it's low nose floor) is only 5dBA...capsule and circuitry combined!

Is this just standard Chinese sellers "label everything, even if it's wrong" mentality?

Re: LDC capsule self-noise?
« Reply #1 on: January 12, 2019, 10:15:50 PM »
A capsule, being a pure reactance (capacitance) has no noise at all. If the capsule also has a built in impedance converter, like most electrets, then that amplifier will have noise, but I don't think that's common for large diaphragm capsules.

It might be a typical value when used with a certain FET, bias resistor, and polarizing voltage. It could also just be some number picked out of thin air to make the buyer happier and the product seem more "high tech" and well constructed. I would not pay much attention to it personally. And, 15dBA isn't all that noisy anyway - a KM 84 is around 22dBA and you can make fine recordings with it. There aren't many (any?) recording studios these days that even get close to the 20s, so don't get too obsessed.


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