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Currently we are running a pair of La Scala IIs combined with a pair of Tuba HTLPs (big thanks goes to @jason str) The LSIIs are bi-amped, time aligned and EQed flat (with the enormous appreciated help of @Chris A) Two years ago I did a DIY project with a pair of 18 "JBL 2242 drivers (specs) which didn't work out very well. The major problem was that I didn't realize the JBLs are bass drivers, and actually not usable for sub applications in a bass reflex cab, where they have problems to keep up with the high efficiency of Klipsch speakers. Also, at that time, I didn't have the proper DSP and amplification. Now I have a Xilica XP 4080, with 2 unused outputs, and a spare QSC DCA series amp. The JBL 2242s are on a shelf in our basement in their original packaging, and I want to put them to use. Klipsch made the KP 480 a number of years ago, a bass cab loaded with an active 18" and a passive 15". They were to go with the industrial La Scalas. So I came with the idea of building a pair of bass cabs in the style of the KP 480, each loaded with a JBL 2242 and a Dayton Audio 18" passive radiator (specs) The bass cabs should have the same footprint as our LSIIs, so the bass cabs can be put under each LSII. Height should be minimum so that the top cab of the LSII is not raised too high. This will give a net internal volume of around 5,8 cu ft. The PR can fire backwards into a corner. I will let the bass cab handle the 40 - 120 Hz region, below 40 Hz can be done with our Tubas. Great idea or a definite no go? Thanks in advance for sharing your thoughts with me!