Hey,
Isnt the source's type (current or voltage) also depnded on how the impedance is connected to the source?
Whether in parallel or in series?
The impedance I'm talking about is not something you can connect to or disconnect from the source. It is an inherent property of the source; it's built-in to the source.
For example, if I take a new AA alkaline cell and try to measure its output current capability with a 100 Amp meter, the meter will look like a short on the output of the cell, and the meter won't limit the current. When I do this I get a current of 12 amps. But if I do the same thing to a NiMH rechargeable cell, I get a current of 25 amps. Why the difference? Why isn't the current 100 amps, anyway?
It's because of the internal impedance of the cell itself. You can't disconnect this impedance because it's a property of the materials of which the cell is made.
A microphone will have an internal impedance (the source impedance) which is an inherent property of the microphone. Different microphones will have different impedances.
This impedance isn't something you can get rid of; you just have to accept and work with it.
If you connect the microphone (or a battery, or a generator, or any source of electrical energy) to a load, and the load might be a resistor which will heat up, a motor, or the input to an amplifier. The load will have its own inherent input impedance, and this impedance will interact with the impedance of the source which drives it.
To get maximum power transfer from a source to a load, it is necessary to match the impedance of the load to the impedance of the source.
Search for "impedance concept" on the web:
Understanding Impedance
The impedance concept has applicability in many places in the physical world. For example, there is such a thing as "mechanical impedance". The transmission in a car is there to match the impedance of the engine (at various RPMs) to the impedance of the drive train at various speeds.