I've got an old 2XS that I don't use anymore sitting in it's original box. Back in the early 90's they were some of the best electronic crossovers you could buy. Awesome specs and they sound really clean. -119 db signal to noise, .005 thd and 18db/octave. These days I use the built in 3 way X-over in my old school Alpine 9813 headunit.