Dear Maril555: Active subwoofers connected in true stereo fashion always are welcome in almost any audio system.
Thinking in " high voice " and if I was you I will connect those subwoofers running and crossing at around 80hz and the Duo subs running from 80 hz and up.
Now, if those JL are/have and can handle/run with high quality performance up to 170hz then I will by-pass the Duo subs. Normally good subs performs very well up to 100hz and maybe to run the JLs up to 170hz could be not very good idea. You have to check/test listen both options and decide.
IMHO the main target to achieve with active subs is not only better bass management but to achieve better mid-bass/mid-range and HF range. To achieve those targets the crossover frequency on the subs and the satellite is extremely critical as is to set up the right subs SPL in a way that the integartion be absolutely seamless/transparent where the subs appears only when the recording is asking for. This overall job take time and I mean time : not hours but several days and even weeks to be exactly " there ".
Only an opinion.
Regards and enjoy the music,
R.
Thinking in " high voice " and if I was you I will connect those subwoofers running and crossing at around 80hz and the Duo subs running from 80 hz and up.
Now, if those JL are/have and can handle/run with high quality performance up to 170hz then I will by-pass the Duo subs. Normally good subs performs very well up to 100hz and maybe to run the JLs up to 170hz could be not very good idea. You have to check/test listen both options and decide.
IMHO the main target to achieve with active subs is not only better bass management but to achieve better mid-bass/mid-range and HF range. To achieve those targets the crossover frequency on the subs and the satellite is extremely critical as is to set up the right subs SPL in a way that the integartion be absolutely seamless/transparent where the subs appears only when the recording is asking for. This overall job take time and I mean time : not hours but several days and even weeks to be exactly " there ".
Only an opinion.
Regards and enjoy the music,
R.