OK, Onto the next order(s) of business.
The baffle wall has been working very nice. I measure its performance by the amelioration of the SBIR issues I had. Now my Center channel has a favorable ETC, and I haven't even finished my room treatments yet!!!
Here's a shot of the ETC. It has a very early reflection which is either off the headrest next to microphone or between screen and speaker baffle(Illustrated with black arrow). The delay indicates a 6" longer pathlength than the primary sound so those are the only possibilities. Furthermore other than covering the speaker baffle with absorption(which I might do) IDK what can be done about it.
For those not familiar with ETC a brief summary. I'm looking at the immediate 20ms after the primary sound(the x-axis). Sound after this time arrival is late enough to be of less concern when addressing SBIR. We want all the sound in this 20ms window to be attenuated at least 20db. So I highlighted the area of concern in yellow. What we want is no major peaks to jump up out of the yellow.
Before the SEOS and baffle wall I had several reflections up 5-10db out of the(yellow) 20ms window. Therefore I attribute the better SBIR control to both the controlled directivity speakers and the baffle wall doing its job preventing unwanted front wall reflections.
Now the astute will notice I didn't mention the L and R. I havent mentioned them b/c my side wall treatments are not complete or currently adequate. Therefore I have not even evaluated them with ETC yet as they are close enough to the side walls that I'm sure they need further treatment.
This treatment brings me to my next project. Room treatments, Lots of them. Many to be covered with thin reflective coverings so as to only operate in the midbass but several to be true broadband absorbers on the side walls and ceiling.
Oh and also a couple more panels to be added to the baffle wall, especially under the center channel.
Happy Friday People, Do work in your Theaters!!!