If your looking for subtle or extreme bass support to your taste where and when you want it, any rear panel manually controlled set it and forget it subwoofer is going to be frustrating.
I have a remote controlled subwoofer system with six memory equalized presets and I'm constantly changing the gain, EQ, or simply turning them off all at the touch of a button from my listening position.
I believe SVS offers similar functionality along with a free trial period?
After a direct in home comparison I can not recommend REL.
My short lived Emotiva amplifier went up in a little puff of smoke in the first few weeks. No experience with the SE8. Have fun with your search.