You have selected the SW, mains and LP locations so you are all set. There is nothing else to adjust if you are intending to use Audyssey. It will take care of distances and levels as well as EQ.
Yes you need to set the level of each sub, then together with the LFE gain in the AVR. Turn on one sub and run the test tone, so it's about 72db. Turn off that sub, and turn in the other one. Set it for 72db also. Now turn on the first one also and measure together. This is where you'll want to move the phase controls to find the most output. This a good start. Then I'd run audyssey, and then rew. I understand much of your placement/WAFwoes. (See pic). What does audyssey set your crossover at for mains?If I understand correctly, the goal is to adjust both subs together to make the best FR as a pair and to also make the transition between subs and mains the smoothest. But, prior to that, are there certain steps I need to take to each sub individually to ensure that the combined sub output is the best it can be? Do I need to level match each sub? Do I need to experiment with different polarity or phase on either sub? Both subs are located behind and about he same distance from the MLP. The room and WAF do not allow movement in position of the subs. Equipment: JL Audio Fathom subs (2) Marantz AV8801 pre/pro with Audyssey XT32 REW UMIK-1 with HDMI Triad in-wall speakers (7)
...sorry just realized your using xt32. If you've run 2 separate cables, your prob good. Except phase.Yes you need to set the level of each sub, then together with the LFE gain in the AVR. Turn on one sub and run the test tone, so it's about 72db. Turn off that sub, and turn in the other one. Set it for 72db also. Now turn on the first one also and measure together. This is where you'll want to move the phase controls to find the most output. This a good start. Then I'd run audyssey, and then rew. I understand much of your placement/WAFwoes. (See pic). What does audyssey set your crossover at for mains?
Agreed. It is most definitely the room, and probably just too much for sealed subs, especially in extension. I also have a cavernous space to fill, and while i mostly can't pressurize it like a closed space, it will to a point. The only sealed subs I would consider for that job would be Gothams, or triax.(over budget) The biggest contribution to overall performance in my space was getting the phase right. Near field placement helped too. I did try opposing corners (both ways) but it didn't do what I hoped. It may for you though. Every room is different. Looking forward to your graphs.Honestly Willis, the JL subs don't have the impact I was wanting. I got the first one and was underwhelmed. So I got another and it helped but still is lacking in my opinion. But the problem is the room I believe, not the subs. I have a large great room with high ceilings that is open to a hallway, dining room, and breakfast area. The open floorplan makes it difficult for all the speakers (subs and mains) to give me what I think is a good sound. Maybe I can move one sub to the front of the room and see if that helps. I'll post some graphs in another thread next week and let you and others see what the sound looks like and if there is anything I can do to help the situation.
Well to start, yes there is hope! I had to spend a little time revisiting your thread. Could you elaborate on dimensions and layout a little more. Also, measurements of the subs in relation to the walls and LP. I found that even one foot can make a difference.Here are my measurements of my subs only. What a mess !! The first graph is of the left sub, right sub, and both subs. I posed the question of what I needed to do to each individual sub to get the best combined response. So I did many measurements testing for the response differences in varying polarity and phase adjustments. What I found was that polarity changes had a very negative impact but phase adjustments may be beneficial. The second graph is the result of these test and shows the four best responses. What do you think? Will Audyssey XT32 help this mess? Which of the phase settings (see second chart) should I use prior to running Audyssey? Or should I leave both subs at 0 phase? Should I get a miniDSP to fix some issues? Is there any hope for decent low-end?