Bought the wrong subwoofer!

they come with a 45 day risk free return policy

have you considered buying a preamp with pre-out/main in.

ANY sub (self-powered), using line in/internal crossover/line (minus low bass) back to preamp is the best way

because

the self-powered sub’s amp takes the job of low bass, most of the power needs

the stereo amp driving the main speakers doesn’t need to make low bass, thus it can be lower power, less cost/size/weight, more placement options

and

main speakers don’t try and make low bass, thus they do a better job.

this is the best way to try tube amps with speakers of lower efficiency than horns, or other high efficiency ones.

Crazy idea but have you tried the rec out to the subs input? I’m not sure if it will work but it carries the same signal as pre out BTW you may want to read the owner manual on using the rec out and if you have to do something to initiate the rec out

The record out does not get attenuated by the volume control.

I’m not sure that is a problem. The sub itself should attenuate the signal by setting the crossover and the gain/ volume. This is off the top of my head thinking but I have had my coffee. So I can’t even use that as an excuse if I am.

BTW what integrated are you using?

Also, you should call SVS and see what they recommend.. This is what you should do before proceeding.