Re: Mic impedance question.

["Mike Curtis" <ironmancurtis@xxxxxxxxxxxx>]

For an electret (which has a built in buffer amp), it doesn't matter as
much.  You'll get more volume, though, if you match the input impedance of
your amp.  I assume it's a guitar practice amp.  Most of these are
considered "high impedance".  Look it up on the internet and you might find
a spec sheet with this information.

For other types, such as dynamic, controlled magnetic, and such, matching
impedances is much more important.  Running a lo-Z mic directly into a hi-Z
input results in less output and usually a more cardboardey kind of tone.

If it's a crystal or ceramic mic, the impedance makes a LOT of difference.
Crystals like a SUPER high impedance.  In fact, if you run them into an
infinitely high input impedance, they sound MUCH better, fuller, louder.

From: "Wm.Galley" <mil-bil@xxxxxxx>

> Still learning !  Should a harp mic be 'high impedance' or 'low' or
> somewhere between ?  The mic element I bought states it is
omni-directional
> "Electret" cartridge; 1.5-10 VDC 0.6 max.  50Hz-13KHz  (Made in Taiwan)
then
> it states "load resistor sets impedance"  I have not picked up a resistor
> yet.
>
> Will this be suitable for a small mic I'm building for use with a 15 watt
> practice amp. ? and what resistor size or rating ?
>                                                    Regards,  bg