Two subs or more. I’m using a pair of Rythmik subs, F12SE-XLR3 and A370XLR3 amp
https://www.rythmikaudio.com/download/XLR3_sealed_quickguide.pdf
I’m also using a Sublimeacoustic K231 as a 2 way XO. The miniDSP XO sounds promising, especially w/ room correction. I’d I was all digital, I’d be more inclined to pursue it. However, I’m not convinced my LPs would sound as good.