Condensor mic question

[zachtheterrible]

I've got this mic that has three wires. It says that there is the ground and output (obviously), but another wire says it has optional coupling. I know wut coupling is, but, I don't get it. It also says that it will respond to -5 db @ under 30 hz. Is there such a thing as negative hz?

 

[Nigel Goodwin]

I've got this mic that has three wires. It says that there is the ground and output (obviously), but another wire says it has optional coupling. I know wut coupling is, but, I don't get it. It also says that it will respond to -5 db @ under 30 hz. Is there such a thing as negative hz?

You can't have a negative frequency.

Condensor microphones often require a power supply - usually 48V for professional ones - your third connection could be power.

 

[TillEulenspiegel]

Nigel is correct, but the 48VDC is normally used in pro-audio mics.If what You have is just a little button with an small audio cable and a red wire , you can try a 9Vdc battery it should work fine. Radio Shack used to sell them.

 

[olly_k]

I think 1.5 / 3 volts max!!!