Help finding a subwoofer

Kota1 thanks I would love to have two smaller subs, I just do not want to close the door to the other options. Also for transportation is great which is actually a high priority for me.

check the Martin Logan Dynamo series.  tight punchy subs that fly under the radar of the SVS / REL big names but are worthy nonetheless.  

high level inputs and the downloadable app has versatile controls with a multitude of adjustments including crossover, continuous phase, slope, etc.  the app is also intuitive to use and you can control multiple subwoofers if you choose.  

My 18" subwoofer was as easy to tonally integrate as the two 12" and the 10."

Using all four subs in the same room essentially eliminated the rooms bass modes and reduced the demand of a single sub. The two crawl test located 12s subs eliminated all but one bass mode in an unused corner of my room. A single located sub should sound fine at the listening position. Your results may vary.

There is no SUBstitute, welcome to the deep end.  

I was very attracted to the iphone control of the SVS subs.  But I feel the REL Carbon Specials sounded much better for music.  It does take a bit of up and down adjustments to get them dialed in, but then you forget where they even are.

They go now used for more than I paid new.

JL Audio!