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Dear Jerry, I don't understand you impedance test jig. Microphone connect to pre-amp input ? after, measure pre-amp output ? Where should the audio analyzer be positioned? The signal generator is

Thanks heaps Jules and Jerry! Great resources and info as always — you've given me everything I need to solve my problem and it's very much appreciated. Cheers, Zander.

Here's the link, in case anyone is looking: /g/MicBuilders/files/Microphone%20impedance%20test%20jig%20Model.pdf

I have uploaded the file Microphone impedance test jig, which uses the signal injection model (IMO a less brutal method than the added load method). You calibrate the unit by making R1 and R2=zero

OK, that's the problem with using a commonly accepted name for a different contraption. So you should consider using a switch to connect/disconnect the potentiometer.

Thanks you for your reply, Jerry, A DI Box is not referring to any commercial product. I was simply talking about a device I made by connecting XLR connectors on both ends and attaching a variable

I would suggest there is a better method, that requires a balanced signal generator. What "*Audio Analyzer" do you intend to use? *

You can't do that, because you don't know the gain (or attenuation) of the DI box. What value is this potentiometer? Ideally it should be about 500 ohms. You m

Thank you for your response, Jerry. Based on the methods you provided, I will proceed to experiment with impedance measurement. The experimental setup is as follows: *Speaker (Sine wave Signal

This is not mandatory for a connection to qualify as balanced. The condition for being balanced is that both in-phase (hot) and out-of-phase (cold) pins present the same Common Mode impedance, i.e.

It would not make sense. The output of an active balanced mic is between pins 2 an

Yes. The output is between pins 2 an 3. that's where it should be loaded. No. Then you'd be wrong.

Your response is very helpful to me. Complexity is not an issue when it comes to learning. If we can derive the correct results, we should endure it. Haha 1. In the case of dynamic microphones, I

Discussing how to load a mic output to measure the -6dB point to determine output impedance... The difficulty is that there are several (at least three) types of microphone outputs to be aware

Thank you, Jerry. I have one question: When connecting the load resistor here, should it be connected between Pin 2 and Pin 3 of the XLR? Or should two resistors be connected separately, one between

I believe Jules mad esome kind of mental typo. I maintain this. In all cases, yes. There are several ways. The best is using an impedance analyzer, but I doubt you have one handy, so you can resort

hello Jerry, thanks to your reply. There seems to be a difference between Jules' response and yours. Could you explain it in a way that is easier to understand? Jules explained that the impedance is

I hate to say this, but te dpa site's technical readings are sometimes inaccurate or simply confusing. I know that they are redacted by junior engineers who are not very scientifically exact. No. The

Not really. Symmetrical impedance is not a concept. A connection? (input or output) can be symmetrical. An impedance is a ratio between voltage and current. It does pot pertain to the type of

Balanced is the term. Symmetrical usually refers to multiphase power systems ? Best Regards, Jules Ryckebusch