Hello,
It sounds like you want to keep your front end.
your best bet if you can afford it is to sell the SVS.
I am not a fan of using SVS for music unless you have to listen to music through your home theater.
Buy any REL with the Speaker wire hookups. If your system is fully balanced only connect the black REL speaker wire to a chassis screw. If you are not sure do this anyways. You can not believe the performance you will get from even an older T9 which can be had for under $700. Make sure the Nutrik cable is included. If you can get two of them. You will be amazed how good two REL subs can be. I know this is a pain and there are great solutions to hook up the SVS. Leave SVS and Emotiva to home theater. That is where they typically thrive in DSP land. I hope this helps and you will understand once you buy the REL(s)