Frequency Response (Hz) VS. Sensitivity (dB)

DRZ said:
50w into a 90dB efficient speaker is going to be something in the region of 106dB. Two speakers, so that takes it up to 109dB and roughly +4dB accounting for your room and you have 113dB. Thats getting on for rather loud indeed!

Listening at more than ~94dB for prolonged periods of time does significant (measurable) damage to your hearing too.

As for B, think flames and the death of your speakers ;)
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I do apologise for asking so many questions but like i did when i was building my computer, i want to understand the numbers and figures, as well as the actual performance, how it all relates etc. I'd rather do it this way instead of choosing things at random and not getting exactly what i need. :)

106dB at full volume? Hmm. Now did you calcuate the dB actually?
 
Look what you are doing!! The numbers are irrelevant as you dont hear in dBs anyway, you hear in phons. Really, the deeper you go the more complex it gets so for most people, "now" is the time to give up :p

Doubling the power adds 3dB each time. Adding another source in a fixed phase relationship gives you 3dB for the first extra source (but more than this means converting it all back to mean square pressures etc). Lastly, the SPL is for a point source radiating spherical waves. You arent in an anechoic chamer or listening outside, so you arent getting spherical waves (4pir^2) you are getting much less than that but thanks to the reflectivity of your walls, you are getting more energy per cm^3 of wavefront, so you can tack on a few extra dBs of SPL at your listening location. This is an ultra-simplistic look at it, of course - there is loads more to it than that thanks to interferences and stuff I simply cba to go into.

This is why you should just go and listen rather than get all concerned over what the numbers mean.
 
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