Originally Posted by John24ssj
Thank you for sharing that, it was a really good read!
I use the AS-EQ1 and having naively expected it (and Audyssey XT32) to solve everything experienced similar disappointment. Here are my thoughts/procedures based on my experience.
1. Run a single sub out of the receiver into the AS-EQ1 and set it to run 1 sub in - 2 subs out. Even if the sub outs on the receiver are discrete just use one sub out and let the AS-EQ1 handle the rest. More on this below
2. Get an app for your phone, a sound level meter or better yet a Umik and REW. Run and measure some sweeps. If you don't have a disk with sweeps you can download them or if you're using REW you can generate your own tones and sweeps with that.
Based on your graphs both at 0 phase seems to get the best (albeit smoothed) prediction so I'd leave that alone and run the AS-EQ1 calibration or verify those measurement by one of the other means I sugggested before proceeding. Unless of course you reposition one or both of the subs as you suggested you might to try to improve on the 50hz area. I would do measurements other than those provided by the AS-EQ1. As stated - it does not provide a measurement - but a "prediction". Best to verify what the actual results actually are.
3. Once you get your best combined measurement run the AS-EQ1 calibration. Now your subs via the AS-EQ1 are seen by your system as a single sub or sub group that you can time align from the receiver.
4. Run Audyssey
***The steps below are referred to as the Post Audyssey Sub Distance Tweak so if you're familiar with it just stop reading and do that. If not......
5. Assess the blend of mains/subs at and around the x-over. Audyssey has never gotten this part right for me. Adjust the sub distance on the receiver adding distance and remeasure until you get the best sub/mains blend at the x-over. There will be some back and forth here until you get to the optimal setting, then likely pass it and dial it back. I usually jump in 2' increments to get a bead on things and help me zero in and fine tune in the right range. The benefit of using the single sub out is two fold here.
a) You can adjust the delay of both subs with a single setting without altering the relationship between the 2 subs that you (and the As-EQ1) have worked to establish through level, phase and EQ.
b) I don't know if this would be an issue being that you do not have discrete sub outs and XT32 but for those like myself that do, and have used the dual discrete sub outs, Audyssey will "re-evaluate" the work you and the AS-EQ1 did to establish the right phase, distance and level settings. It can essentially throw all that work out the window and impose it's own will with unpredictable - potentially - usually inferior results. If Audyssey sees your subs/sub group as a single sub then all it tries to do is set levels, distance and (if XT32) EQ the "sub". In the case of XT32 the EQ can be helpful. In the case on both XT32 and other versions, it rarely gets the distance/delay correct in relation to the mains (thus the reason for the distance tweak). Many users also find they need to raise the sub level post Audyssey 2-6 db to get satisfying results - depending on taste and goals of course. It's a useful tool but these are 2 weak areas.
Not to bash Audyssey because I use and appreciate the EQ capabilities but it never yielded optimal results regarding time alignment of the mains & subs and I was disappointed for years. Since I started employing the distance tweak I have gotten better results and been much happier. I think you will be too regardless of whether your version of Audyssey EQ's the subs or not as the AS-EQ1 will already have done what it can there.
Keep us in the loop.