Set-up with two subs and an integrated amp

If your budget is tight you may want to try this subwoofer:
https://www.parts-express.com/bic-venturi-v1020-10-160-watt-powered-subwoofer--303-430?gclid=CjwKCAjwh472BRAGEiwAvHVfGpz2RVPHoH2yMYFGKiB1fOotJTCDVHRtxqW7K0zbm3wgTTKQcUuGrxoCJNAQAvD_BwE

I've had one for about a year and I like it very much.
Very tight and musical.

Millercarbon,

That is wonderful information. Thanks. Why is no one listening? Oh, I know, they're too busy listening to  themselves.

I've noticed by some of your comments that we may have more in common than one would think. Besides a shared appreciation of the RSL 3600s I should tell you that I also go by SpdYlw993.

Yes call Svs they Have them Or can recommend the only thing you need is a 2 Pr of either spade or bananas crimp on and some awg 16 wire that plug in the speaker terminals   just Velcro’s 
to hold on I have a pair of Rca from there that plug into the sub.It’s also more accurate signal direct from speaker outputs

Call crutchfield for the subwoofer subwoofers adapter.
it has several small resistors under $30 ,you can buy 2 pair of
screw or crimp on bananas or spades you need to hookup
tp the loudspeaker terminals..

Millercarbon,

That is wonderful information. Thanks. Why is no one listening? Oh, I know, they're too busy listening to  themselves.

I've noticed by some of your comments that we may have more in common than one would think. Besides a shared appreciation of the RSL 3600s I should tell you that I also go by SpdYlw993.

Porsche Panorama Technical Editor Alan Caldwell had the most perfect 914 you ever saw. Speed Yellow over black. Al also had a Speed Yellow over Black SC. When he showed up at a concours with a brand new 996 I looked it over real good, walked up to Al and said, "Speed Yellow and Black?" Without missing a beat he said, "Is there anything else?"
When one day my wipers stopped returning to park I went looking for answers. None of the (seriously good) Porsche techs new for sure what it was. Unwilling to start throwing money at the problem but running out of ideas I turned to Al. "There’s a little copper tab inside the switch. It loses its spring after a while. With a toothpick you can bend it back." Sure enough. Saved me a thousand dollars. At least.

Pays to listen. It really does. Some of us figure it out.