Originally Posted by
TheTodd
I have my 8” midbasses & subs crossed at 70Hz @24dB and they perform very well with minimal buzzes or rattles, but that’s with heavily deadened door panels. I also have a 350Hz @24dB crossover point between my 8s and 3” mids. I’m not familiar with the Morels you have but, guessing by the model number, if they’re 4” you could get away with a much lower crossover point if your stage seems to pull down. You can use the same method for the mids as you do with the midbasses… mute everything else and lower the crossover until you hear distortion or any breakup. There’s no set of crossover points that are one size fits all… every install can effect the frequencies needed to produce optimal results.
One thing to remember about crossover slopes is that for every 6dB slope, it introduces 90 degrees of phase shift. Every install is different but if you’re using 12dB/oct slopes, theoretically your drivers are now 180* out of phase from each other. So using the popular 24dB slopes brings everything back around to 360* and everything is in phase again. Plus it’s a little more of a safeguard to keep unwanted frequencies out of your speakers.