What's the equation for summing 2 ac waveforms?

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Here's the equation I used for the summed signal:
sigT=10*LOG((((10^(Sig1/10))+(10^(sig2/10)))^0.5)/0.000016666)

I used .000016666 as the reference power level based on the dBm scale that assumes 1mW and a 600 ohm impedance.

Right now the curve looks good, but it's a few dB above the other plots. I think once I bring phase into the equation it should be fairly accurate.
 
Incase anybody is interrested, here's the spreadsheet so far:
http://www.sover.net/~lirace/Jim/crossover_slopes-A1.xls

It's very crude at the moment, and not altogether real accurate, but the idea is there. It's a somewhat different approach from the other stuff I've seen in that you can tinker quickly and easily just by independantly changing crossover slopes & frequencies of each individual driver. Once I get those slopes accurate, I'm going to have it calculate component values from it. But... I have a long way to go before those plots are accurate.

Anyway, enjoy. If anybody has any suggestions, feel free to give them. Just keep in mind that this is just a toy right now... it's not a tool yet.
 
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