Re: 12DB-24DB Slope?
The crossover filters are to protect your speakers and to keep bass at the subwoofer and not have the subwoofer playing vocals. If you have a low pass crossover of 100 Hz on your subwoofer that means at 100 Hz the level is reduced 3 dB. With a slope of -12 dB, at one octave higher, or 200 Hz, the level is down another 12 dB for a total of -15 dB. You would almost never use a 100 Hz 12 dB/octave slope on a subwoofer because you can still hear a lot more than just bass with a slope that shallow.
New online business launching soon. Specializing in car audio system designs and sales for those seeking great sound.