Stupid question regarding voltage levels

[Toby Paddock]

The dBm that I'm used to is dB above 1 milliwatt into 50 ohms.
The m is milliwatt. 

0 dBm is 1 mW
3 dBm is about 2 mW
10 dBm is 10 mW
30 dBm is 1 W (and about 7 volts I think)
-30 dBm is 1 microwatt

Is it used in audio? Like with 600 ohms? I don't know about that.

I shouldn't try to answer questions without checking my facts.

 - -- -  Toby


Said Jim Johnson[SMTP:jamos at technotoys.com]:

I feel the fool, but I don't have any references handy...

What is the reference level for 0 dbM? And are these ratios based on
voltage, or power?

Thankee..
Jim Johnson 
Metaphoric Software
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