Just looking for a quick answer

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Bguzaldo

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I looked at the Mic FAQ and couldn't find the answer to this question, so here it goes.

For a mic and a preamp which should ideally have the lower impedance? I have an art mpa gold and a rode nt1000 rated 100 ohms and with the mpa's variable impedance settings up to i think 3000 ohms i was wondering which should be lower the mic or the preamp?

Thanks:confused:

-Barrett
 
Bguzaldo said:
I looked at the Mic FAQ and couldn't find the answer to this question, so here it goes.

For a mic and a preamp which should ideally have the lower impedance? I have an art mpa gold and a rode nt1000 rated 100 ohms and with the mpa's variable impedance settings up to i think 3000 ohms i was wondering which should be lower the mic or the preamp?

Thanks:confused:

-Barrett
Click to expand...

i'm not sure if the MPA go up to 3000, but normally mic with high impedance are not as good as the low ones. So when you dial your preamp to a higher impedance than the mic require it's still ok, just that sometimes it'll sound slightly difference.
 
warlock110 said:
i'm not sure if the MPA go up to 3000, but normally mic with high impedance are not as good as the low ones. So when you dial your preamp to a higher impedance than the mic require it's still ok, just that sometimes it'll sound slightly difference.
Click to expand...

Thanks a lot man!
 
A Mic pre should have an Input impedance of at least 10x the source impedance ,So a 150 ohm mic should have a mic pre with at least 1500 ohms input impedance....so with your 100ohm mic you should have the imput impedance set to at least 1000 ohms for the best signal transfer.....

Cheers
 
Minion said:
A Mic pre should have an Input impedance of at least 10x the source impedance ,So a 150 ohm mic should have a mic pre with at least 1500 ohms input impedance....so with your 100ohm mic you should have the imput impedance set to at least 1000 ohms for the best signal transfer.....

Cheers
Click to expand...

Awesome that's all i needed to know, thanks so much
 
Minion said:
A Mic pre should have an Input impedance of at least 10x the source impedance ,So a 150 ohm mic should have a mic pre with at least 1500 ohms input impedance....so with your 100ohm mic you should have the imput impedance set to at least 1000 ohms for the best signal transfer.....

Cheers
Click to expand...

The desc. on my SM7b says "Impedance: 150 ohms (150 ohms actual), for connection to microphone inputs rated at 19 to 300 ohms."

I'm not doubting you, but can you please explain your reasoning?
 
Guitarer said:
I'm not doubting you, but can you please explain your reasoning?
Click to expand...


what he's trying to get across is concerning the mic's (or any source) ability to "drive" the next stage... the source has to provide enough current (not voltage)... and the higher the impedence of the next stage the less current it takes... if you look at it through the infamous ohm's law... which states that the voltage is equall to the current X's the resistence(or impedence) V=IxR... you can see that I=V/R so the current required lessens as the resistence goes up... conversely if the resistence goes down and the supply current sags the you no longer maintain your voltage and ya get no signal or significantly less atleast... make sense??? the 10X's rule was just a practicle limit... after that point an increase in resistence yeilds little value...
 
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