better hop in on this discussion while I'm at it.
I have also ordered a digital SPLmeter (from Germany), and the confirmation email that my bank transfer has been recieved should be arriving after this weekend. Then it's waiting for the delivery.
My goal would be to measure the SPL (of course), but also to use Goldwave's sine generator on this PC to send certain frequencies to my to-be-built subwoofer. Then I could compare the backyard SPLcurve to the in-room curve and determine the room gain.
The predicted anechoic curve should be -3dB at 30Hz, so if I don't see this in my backyard, maybe I could use this info to make correction curves for the SPLmeter.
(I'll ask a friend of mine who studies civil engineering, if he can't help me with some equipment in a lab or so.)
Well ... how about measuring the cuve of my speakers?
- As long as there is no room gain, the reflected soundwaves shouldn't interfere too much with the signal.
- Phase differences between orig en reflect sound are more important with lower freq, so high freq should still be accurate enough to measure.
- If one would go for the pulsed-response, the difference between "fast" and "slow" peak-SPL-measurement would be insufficient to filter out the echo. (Unless one has a room longer than, ... lets say 340 meters?

)
- If I can get a good correction curve with the help of my friend and the university lab, then I could calibrate my el-cheapo microphone and use a freeware measurement program on my PC to generate tones/pulses and use the pulse-technique to eliminate the echo's and reflections. This last one would be the best option I think.
Anyone other idea's?