QSC K12.2 do go low. The measurements are online at QSC.com including frequency response, and EASE & CLF data. You won't find these measurements for a bass cab, but if you did they wouldn't compete much with a K12.2.
Now some may not hear a k12 as going low due to an audio illusion. The mids/highs from the horn have a wide dispersion pattern. You'll hear more of the mids/high even close up, an this fools you into thinking there is less lows.
Two k12.2 wouldn't go lower, they'd go louder with the same frequency response.
If you do need more low lows (i.e. Fundamentals) you would generally add a subwoofer.
Subs too have EASE and CLF data and you can model how well they will actually work together in a venue with this data.
Now some may not hear a k12 as going low due to an audio illusion. The mids/highs from the horn have a wide dispersion pattern. You'll hear more of the mids/high even close up, an this fools you into thinking there is less lows.
Two k12.2 wouldn't go lower, they'd go louder with the same frequency response.
If you do need more low lows (i.e. Fundamentals) you would generally add a subwoofer.
Subs too have EASE and CLF data and you can model how well they will actually work together in a venue with this data.