No, I was doing a diagonal 1 meter to driver/port, but I am guessing on the ground farther away is more accurate (in terms of absolute spl and relative spl)
Since I don't know what you mean, probably not. If you are asking if I am using the left channel to measure, yes.
Is this because of background noise, wind, etc..?
I still think 2 subs will be needed (weird pressure difference between ear) so I don't get distracted by noises (rattles etc..) where the subwoofer is...
I was planning on more power and EQ anyway
Yes, I broke it in for 3 weeks.
I assume you mean what the VU meter says on the input without any signal. -42dB
Pro stuff is measured farther away to get away from the 'velocity' issue that will affect the measured FR. Tom talked a bit about this issue, but I don't recall where the post was placed.
Place the mic on the ground when measuring the cabinet outside.
Measure on the right channel, and tick the box that says "use left channel as calibration reference" You will find this under 'settings' in REW.
I use an RCA>RCA cable that physically connects the soundcard output on the left channel to the left channel input. This is what is meant by a 'loopback'.
Yes, I was meaning that outside wind noise, trains / traffic will affect the measured FR down low.
Use the sine wave generator in REW to sweep for rattles and go around, fixing them. Rattles will totally ruin the perception, fix them or you will go loopy...
A little bit of thin foam weatherstripping tape can do wonders for hanging pictures, etc.
Can you post graphs of the measurements with the suggested settings for REW? 15-200 hz, 45-105db. Alternately, you can PM me, and I will give you my email, you can send the .MDAT file ( measurement file ) and I can take a look at it.
Some absorption inside the sonotube will be needed to kill the end to end resonance.
42 db noise floor is pretty decent, you should be able to get relevant measurements.