Re: OK to use TV coax for microphone?

Les. wrote:
> "Martin Griffith" <mart_in_medina@[EMAIL PROTECTED]
> wrote in message 
> news:sh9p14hjdd2992avksh5uaiuhnset5vnek@[EMAIL PROTECTED]
>> On Sat, 3 May 2008 17:01:19 +0100, in sci.electronics.design Ian
>> Jackson <ianREMOVETHISjackson@[EMAIL PROTECTED]
> wrote:
>> 600 ohms is dead and buried, for the audio world.The only time it is
>> mentioned is in data sheets, "will drive XXdB into 600R" etc
>>
>>
>> martin
> 
> Quite so. The concept of matching a microphone's impedance to get the
best 
> power transfer has not been practiced for a considerable time.
> Modern dynamic mics expect to look at a "bridging" impedance e.g. around
10K 
> for a mic having a Z of 150-200 Ohms and to operate as a voltage, rather

> than a power source.

No they expect to see 1K2 to 2K not 10K and that is what most pro mic 
pres provide. 10K input impedance is for bridging line levels.

Cheers

Ian