For anyone who is still monitoring this thread, I did some more measurements and tuning. I did not get a close mic graph of my rythmik sub this time around, sorry I forgot. But this time I effectively used the subs phase adjustment to correct in room cancellation. So the graphs:http://www.avsforum.com/avs-vb/attac...id=61069&stc=1
This is my MMGs after I eq'ed them to my goal, which was +-3db. They naturally begin to roll off at 80hz in my room so I picked a hipass crossover point of 80hz (this graph shows the response pre-crossover)http://www.avsforum.com/avs-vb/attac...id=61070&stc=1
Here is the Rythmik sub low passed at 80hz. With the phase adjustment at it's zero position on the Rkthmik servo amp. The phase is relative to another speaker. So with only one speaker playing any given frequency there is no worry about phase, it is not until you add another speaker playing those same frequencies that phase matters. So next we add the sub in with the MMGs both crossed over at 80hz. Rember this graph is in room response, and as you can tell I need to do some acoustic treatment in my room to get rid of the 60hz dip, and flatten out the 30hz dip.http://www.avsforum.com/avs-vb/attac...id=61071&stc=1
So here, even though the crossover points are the same (80hz) I still have both speakers, the MMGs and the Rythmik sub, playing the same frequencies at that crossover point. That will happen, as all crossovers have a roll off and are not brick walls. Even if it is -6db down they are still playing the same things. When you combine this out of phase response the soundwaves combine to form cancellation. That is the large dip from 80hz to 200hz with the large jaggies. (one reason it lastes so high, 200hz, is because of the missmatched volume of the sub compared to the MMGs. I like a lot of bass, so my "house curve" includes running the bass higher than mid and trebble.
I have hit my maximum number of pic uploads so I will continue in another post.