It is capible of more than enough output. A pair or rated power could easily do low 140s in the correct alignment. I chose to build him a 1.7 cubed box tuned to 28. It's quite efficient Down low and has plenty of lowend in that box. It could actually go nicely as small as 1.5. I wouldn't tune below about 28 and above 35. It's a little bottom heavy in the 1.7 but I have a good deal of port area so it tends to be that way because of the lower q around tuning. If I had to retune it i would do 1.5 tuned to 30.. It's just as clean as any reference woofer I've heard.