This is an excellent crossover for the price and is the only one I’ve found that had the frequency and slope options I needed. With a 24/db lowpass of 250hz down to 32hz and bass boost 0 to +12db down to 25hz, you will not find another xover with this kind of flexibility near this price range.
I’m using this xover for my sub channel only so I can’t comment on the front/rear output. The EC20B combined with my amplifiers lowpass and subsonic filter allows me to get the exact slope needed for great sound quality in almost any application. Crossovers 2x and even 3x the price often do not have the frequency range or offer as steep of a slope.
I’ve used the EC20B with four 15’s in a SPL setup and again in a SQ setup with two Alpine SWR1024d. Both times this xover allowed me to get the response I needed. I was skeptical at first about the brand/price but the EC20B is now a key component in my installation.