Hello.
I am building a low frequency microphone out of a 4-ohm speaker by running it in reverse. I plan to hook it up to an XLR jack. From what I have gathered online, you hook up the plus/minus leads of the speaker to pins 2 and 3 on the XLR cable and leave pin 1 open. Does that sound right?
Also, I found on a website that you can make a U-pad (the first figure) to attenuate the signal. Now, how would I find the impedance of the microphone/pad circuit? The link says that it is just the value of R2 but that does not make sense to me... wouldn't it be the impedance of the microphone/speaker (4-ohms) + R1 combined in parallel with R2?
Thanks!
I am building a low frequency microphone out of a 4-ohm speaker by running it in reverse. I plan to hook it up to an XLR jack. From what I have gathered online, you hook up the plus/minus leads of the speaker to pins 2 and 3 on the XLR cable and leave pin 1 open. Does that sound right?
Also, I found on a website that you can make a U-pad (the first figure) to attenuate the signal. Now, how would I find the impedance of the microphone/pad circuit? The link says that it is just the value of R2 but that does not make sense to me... wouldn't it be the impedance of the microphone/speaker (4-ohms) + R1 combined in parallel with R2?
Thanks!
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