Research for subwoofer

Thanks for all the input Sounds like you have narrowed the field for me and given me great things to try.  I look forward to the experiments that are about to happen.

Budget I was looking at depended on what folks said.  From what I see I can do many of the suggestions for under 1400 and that would work well for me If I hear a real improvement.

No better value than prices on the last gen REL Carbon Special. 

For your room size I would suggest the REL S Series if you go with REL.  They are expensive though as in >$3k.  You’d likely be better off with some Rhythmik subs.  Easier on the pocket and excellent performance.  I have a couple of RELs (T5/x) for my small space and they are outstanding but would get swallowed by your room.  The T9/x would might be sufficient with two or more but they only go down to 27Hz.  Something like the S550 goes down to 19Hz.  The Rhythmiks play low like the S550 but at a fraction of the cost.  

@kuttler https://hsuresearch.com/collections/collections-true-subwoofers-subset-collection/products/vtf-tn1

Unless my Google is mistaken this is the second thread this week where a person has A Luxman 509, a $10-$15,000 integrated amplifier paired with budget speakers. Though I do agree that getting a subwoofer is in order finding speakers that will dance better with that amplifier would do you a whole much more good at this point. Just my opinion maybe I’m wrong about the price of the integrated.