Hi brucek. I took one of my speakers out into the garden today to test it along the lines you suggested. The garden is fairly small with quite a few bushes etc. but it is as neutral a space as I can test in, short of going up to the local park!
Here are the fre. resp. and waterfall graphs. They are quite revealing I think, though obviously I am only beginning to understand what I am looking at!
speaker test outside.jpg speaker test outside waterfall.jpg
It looks pretty even to me with the predictable drop-offs at both ends. However, there is still a small peak at 25Hz and a small dip just after 100. I don't know how significant they are but it does look like the mic / speaker combination is contributing somewhat to those two areas. Obviously, the corresponding aspects of the room graph are much more pronounced so I know I do have a couple of room-related issues there. Still, I thought it might tell us something.
The other thing that strikes me is the huge dip and peak at 4.8kHz nd 6.5kHz respectively. What's going on there? That is pretty much the same pattern as appears in my room graph so again must be at least influenced by the mic / speaker in some way.
Just out of interest, here is the graph of a measurement I took earlier inside in the middle of our living room which is pretty big; same setup as outside. I did it again outside because I suspected the room was affecting things in some way. I noticed the huge dip at 55Hz and the lack of any peak at 25. Hmm..
speaker test 1.jpg
I realise every environment is going to yield somewhat different results but I thought this big room vs. garden might be interesting. The next thing I'll do is the backward / forward testing you suggested re. trying to nail that 100hz dip. Will report back. (Oh no, not more graphs!
)
Cheers,
Mark