I have to agree! I didn't compare a fairly large amount of capsules for valid statistics. Just a few no name speciments. Indeed, I found that the small 6mm were bettter. Still, not flat response, but it was roughly estimated. The graph in post #33 was found on the internet together with a few other -not many different. Then I made the simple thought that there should be a few manufacturers -how many are there?- each one producing capsules with more or less characteristic and predictable paramaters, just like the WM61 had its own consistent behaviour.
It's true that what I did does not qualify for critical +/-1dB measurements, let alone phase deviations. I only posted it for inspiration. Perhaps, more knowledgeable people could take it a bit further.
It's true that what I did does not qualify for critical +/-1dB measurements, let alone phase deviations. I only posted it for inspiration. Perhaps, more knowledgeable people could take it a bit further.
if i do the same thing, with the mic less than 1cm away and without the crossover, do i get the true frequency response of this damned yellow cone/woofer?
No, sorry 😉
You'll miss the effects from the larger things like the cone and the cabinet front. (These aren't doing much through the bass but you have a problem higher up.)
You'll miss the effects from the larger things like the cone and the cabinet front. (These aren't doing much through the bass but you have a problem higher up.)
The ECM8000 has huge variations from unit to unit, charge to charge. It is impossible to use a "universal" calibration file and will probably make your measuring results worse than without. There is a German company that has calibrated huge numbers of microphones from many brands. The ECM8000 seems to be made by different contractors. Even if you had a response file for the capsule used, when it is build into a case the response will change. Just like a speaker driver has different response curves, depending on the baffle it is in.
Here is a link, they have calibrated 636 individual ECM8000 so far. Maybe now you understand that this mike is just usefull in a limited frequency range as you have been told before you bought it. There is no universal file turning the cheapest product on the market into a precision tool.
https://www.hifi-selbstbau.de/index.php/hsb/messen/neulich-beim-kalibrieren-von-mikrofonen
https://www.hifi-selbstbau.de/index...k/1000-mikrofonkalibrierungen-eine-uebersicht
Here is a link, they have calibrated 636 individual ECM8000 so far. Maybe now you understand that this mike is just usefull in a limited frequency range as you have been told before you bought it. There is no universal file turning the cheapest product on the market into a precision tool.
https://www.hifi-selbstbau.de/index.php/hsb/messen/neulich-beim-kalibrieren-von-mikrofonen
https://www.hifi-selbstbau.de/index...k/1000-mikrofonkalibrierungen-eine-uebersicht
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If you want to know what your woofer does, do an impedance sweep. It will tell you the resonance frequency, which depends on the cabinet the driver is in. Your build will not give you much bass response, it is typical for a satellite to be used with a subwoofer.