Now here are some detailed charts and such that I did. This was with my old preamp, that was Halo C2 and an old EQ I had, the DSP30.
OK. Craig John from AVS came over on Sat. I asked him over so he could help me take some more measurements. We got them but I think somehow, I don't know how, my center was damaged. Craig thinks that maybe were turning the amps on and off to many times. We really did not tax it that much. After it happened the center sounded distorted. Now it has lost much of its SPL. So at this point I am running a phantom center, which surprisingly, sounds very good. I guess that's partly due to my setup. I want to show a before and after with the changes I have made. The first Chart is Craigs FR chart. In another email,This is what he told me about that chart:
I believe the charts are for the L\\R speakers not all speakers
With an 80 Hz crossover, the left part of the graph is the sub by itself, (from 80 Hz down.) The speakers take over at 80 Hz and from there up to 300 Hz, (the last gradation in the graph is 250, but the right edge of the graph is 300), the response is pretty much all the speakers. The peaks at around 100 Hz would be from the speakers, not the sub. The valleys from about 175 Hz to 300 Hz are also from the speakers. However, they are caused by the interaction of the speakers and the room. They are NOT the native response of the speakers by themselves.
The second is Mark's original FR chart that was with the big wall unit in the room, my big Sony TV and no room treatments. The Third chart is the Response Time chart. Now, also, here are some of Craig's other thoughts:
"Hi Mike.
I've attached the the graphs of your frequency response, real time analysis and RT-60. I saved them as jpeg's, to reduce the file size. They all show the bump at about 100 Hz and the dip at 250 Hz. Other than those 2 issues, which I believe are room related, (and likely not fixable without Room Correction/EQ), your system measures pretty good. The one graph that really surprised me was the RT-60. In your small room, I expected a longer reverb time, so to see it below 250 ms over the entire range, and under 200 ms over the range above 250 Hz was quite surprising. The low reverb time is certainly due to your room treatments, so good job on that! Also, fortunately, your system *sounds* even better than it measures. I'm sure this is also due to your acoustic treatments. Dennis and I really enjoyed the day yesterday. However, we both felt bad about the way it ended, with the blown Center Channel speaker. Hopefully, it won't be a big deal to get it fixed. If it's any kind of a hassle, let me know and I'll try to help out. In the meantime, enjoy your system."
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