Dear friends: This is something that could help you to integrate the subs to your main speakers:
- first you have to find the best place for your main speakers.
- you can do that with the whole system " on ": speakers/electronic crossover/subs. Then choose the crossover point: 80Hz ( it is a good point to start ) and turn " off " the subs volume/gain and listen to your main speakers that now are working from 80Hz and up.
- listen and listen and listen through your main speakers and move them ( if neccesary ) till you find the best mid/high frecuency response performance.
- then do the same with your subs: alone ( main speakers off ) till you find the best room interaction with.
- now, with the whole system " on " : listen and listen and listen till you identified problems with the seamless integration of the main speakers/subs, that is the target.
- here you have to " play " with small changes in: crossover frecuency, phase, volumen/gain, room treatment and very small changes in the site of the subs/main speakers, till you " done ".
This is only a way to do it and give me the best results to integrate subs, not only in my system but on severals others systems. Sure you can do it in a scientific way. There are no absolute rules here, the only one is: " test and error ".
Regards and enjoy the music.
Raul.