OK - I have done a set of initial measurements today, mostly to get the feel for REW. I have to say I am highly impressed at how easy it is, once you have the Windows part set up and also thanks to Jerry's guide. I was also highly impressed at the way one can easily take the different measurements and then examine the graphs in a multitude of ways. It is all a huge step forward from my OmniMic.
I did all of the Jerry-recommended tests today, but limited myself to Audyssey ON at this stage.
Frequency response: this was more or less as expected and broadly in line with my OM graphs. The same problems are there and mostly they are things that I either cannot change or they don't matter all that much anyway. My personal goal with FR is to be +/-3dB across the spectrum and I am not too far from that. I will post graphs later - I want to concentrate on problem areas right now.
Waterfalls: here I have problems. Persistent ringing in the 20-30Hz range. I am investigating more sophisticated room treatments but I am not hopeful of fixing this in such a small room with so many limitations on placement etc. As above, graphs later. If anyone has any experience or advice on fixing 20-30Hz ringing, I am all ears...
ETC: this is the interesting one for me right now and I would welcome advice from members because this is an area I can actually control. I am posting below the ETC graphs for my front left, front right and centre channels. They are not too bad and the spikes that need attention are, I believe, fixable with additional treatments. (Jerry, you were right about that picture!). I have not done the string test yet but I am fairly confident that the obvious reflection points are the ones causing the issue. I will confirm with the string test but right now I am clean out of string!
One question concerns the sort of treatments I need for these reflections - will GIK's 242s be OK or would I be better off with their 244s, which I am using in the rest of the room? I would prefer 242s if they are sufficient because they are less expensive and if they do the job then they do the job. OTOH I am happy to spend the cash if 244s are required. Anyone any thoughts? Jerry, I would appreciate a comment from you especially as I know you also use GIK treatments.
Final problem is one for me - one of the reflection points is bang across the pair of doors which now serves as the sole entrance to the room. These doors are glazed and the room on the other side is our sitting room. Although Mrs Keith is amazingly tolerant, I do not want to push her over the edge, so I have refrained from treating these doors on the HT side even though I have known for some time, intuitively, that they need it. It is easy enough to fix some 242s to the back of the doors, but of course their backsides will be seen from the sitting room. If anyone has any suggestions, again I am all ears.
I would also welcome any other comments on the graphs below as this is the first time I have made ETCs so all help is welcome. Thanks guys.
Right front, Audyssey ON:
Left Front, Audyssey ON:
Centre, Audyssey ON: