tmsrdg,
I was going to buy either a Rel or Svs.A local dealer that I trust recommended a GoldenEar SuperSub xxl.After reading Absolute Sound’s review of SuperSub,I took one home.Msrp was 2 k,dealer sold it to me for 1600 out the door,new in box.I really liked the Svs Ultra,but think SuperSub Is a little better!Ive had it for about a year,with nothing but good things to say about it.Using pre outs of preamp,instead of sub output made the sub come to life!Blends seamlessly with my 3.7’s.Absolute Sound said it was very musical,and it is!Im using one sub,right inside of my left speaker.A bass crawl test gave me that location.I think one sub is enough for me!Adding a subwoofer to my 3.7’s made everything more fun to listen it.I couldn’t imagine not using a sub now!Good luck with your sub search!Finding the right piece is half the fun!