Are tandem (cascading?) passive / active crossovers cumulative? i.e. if I have an 18db/oct active high-pass signal going to a passive crossover setup that kills another 12db/octave, is my total 30db/oct or is it 4x whatever signal comes from the active setup? I'm trying to make sure there are no gaps. Thx.

 

Help me with what all you are tryin to do. And ill answer it.

 

3 amplifiers. One powering 6.5 & 1" front components, another powering similar rear components, third powering 12" sub. The amps are 1st gen Kicker (2 100si and a X100) that take plug in mods, of which I am missing some chips and must "pass though" at least two.

I have a low pass SWX active crossover for the sub amp set at 100Hz. The components are filtered through passive xovers that they came with. I have an old set of 100MR kicker crossovers that I can high-pass at 12db/oct (component set), or I can low pass the sub on one of them and use the SWX at 100Hz high-pass instead.

Or, I can daisy chain the amps (sub first - low pass the amplification & high-pass the output signal), but this would bypass the head unit's ability to fade and control subwoofer output.

To be perfectly honest it isn't a major problem - its more a curiosity, and if I have the time may let me ears decide on the set-up. Just don't want too degraded a signal to finally make it through. Don't want to buy an expensive processor either.

 

If you are trying to keep from ending up with gaps. Then run the LPF at 100 which is what you have. Then take and run each set of comps at 100hz HPF. This will help to get closer. (And if possible all the same slopes)