So I bought a sundown x-15 based off the rms and it being a sundown sub. I had a sa-15 and loved it, it hit all the notes I wanted and put in work. I had it powered by a kicker ix1000.1 in a 3.5 ish box tuned to 35hz. Now I just swapped the subs in the same box so I'm not too sure what the box is tuned to with the x-15 it hits low notes really nice, but most of the music I listen to doesn't have low low notes. My question is should I keep the x build a box for the x. And get a 8 or 10" for midbass, maybe that will fill the gap. Or sell the x a d get maybe a fi bl or ssa xcon, right now they will be powered by a alpine m240 later upgrading to sundown saz 3500 for a pair. Goals are all around daily sub, that hits all notes high and low lp 80hz most music I listen to on daily Barely has any low notes so x sounds funny,