Checked out the Rythmik site the other day and noted their technology but was not a fan of the return policy, especially having to ship back such a heavy item at my expense with a restocking fee.
I did watch the YouTube video about servo subs and was very informative, so thank you for that. I also watched some other reviews and placement was more crucial with the Rythmik than the REL and being that is an issue for me could be a deciding factor
Still waiting for more info on my actual question though from others and thank you for sharing your brand experiences.