Aren't you mixing ported and sealed also?
My solution for nearfield was to get another ported sub close in performance to the ones I already had and set it up right behind me. I've got puh-lenty of tactile response now.
I think Zilla's suggestion of a PB1000 Pro or Speedwoofer would work pretty well nearfield.
Question then, I can get a replacement AMP from Polk for the PSW505 that sites perfectly under my end table. As a reminder, that has a high pass filter on it at 40 so it really only is going to play 40-80 while letting the main subs do the real work down low. That AMP would cost me ~150 including shipping and tax.
I can also get a RSL Speedwoofer for $300 that the seller claims is New In Box. That is a 10 vs the Polk which is a 12. Assume the RSL is great for a 10. I need to research the capability of the two vs. each other but if anyone knows, I'm glad to get your facts/opinions.
Other option is I just forget the near field option and use my main subs and that would be fine too.
By the way, the issue on the 505 presently is it putts out a static sound for a while. Then somehow there is a small pop like it kicks in. And then works great from there on out. So I don't know what component inside the AMP is wearing out and if it was a cap or something I don't know if that would be easy to replace but that might be a wild goose chase to try to fix such a sub/amp.
Thanks, welcome any other thoughts