New JBL W12GTi MKII waiting for a home. Need to do sealed as space is limited but plenty to work with for a proper enclosure.

Looking for it to attack the lows and have a flat(ish) response. Not a ground pounder, rather a SQ build for this old man.

The recommended enclosure size for the 12 sealed is 1 cube. From my understanding of sealed boxes, the bigger the sealed box the better the lows will be. I think it's because the fs is lowered? Not sure if that's what it is.

So if you want it to play lower better than go with a bigger box. I'd say around 1.3-1.5 cubes.