Hi
I missed something… I suspect you are using some signal processing, right?
I had a pair of Sonata IIIs sans sub.
later I added a velodyne DD15.
I then chose to go without the HT aspect using the sub simply to augment the Sonatas lower end.
I employed the DD 15s room EQ and found the best spot in the room to locate the sub. long story short… eventually I changed the auto settings the sub’s mic and eelctronics chose during its outlined installation and went with taste instead.
there was not a ton of desparity between these settings, but I did alter settings from what the subs’ EQ decided for me to what I chose.
the info provided here above is great. don’t mnisunderstand me. I simply wanted to interject that maybe once things are set accordingly to what ever acoustical scheme seems to work on paper, your input matters more, IMO.
during HT setup I went with the LFE only input…. later I went using the stereo inputs as fed from my preamp.
the best situation would have been for me to have bought two subs probably.
next time I will get two of them.
often getting bass issues corrected usually means adding bass traps as bass corredction can only do so much.
best of luck. enjoy