Crossover bump.

[The Camry]

So as far as i have always understood it. Crossing a speaker over at say 100hz means its its 3db down at that frequency and then goes down more for whatever slope you have. I also get that how it gets to -3db is also effected...

referring to the first pic. how different slopes effect how it gets to -3db.

Ive always heard that if you crossover two speakers at the same crossover point. you get a hump in the frequency response. Something like..two speakers in phase gives those freq a boost.

So heres my question. Lets say you crossover a sub and a midbass at 100hz. instead of them both being at -3db at the crossover point. wouldnt them both playing the same frequency actually create a slight dip at say 90 and 110 and then a big bump in the freq response right at 100hz?

i havnt been able to find any pics of graphs or whatnot that shows that..

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[trumpet 5,000+ posts]

What you want to look up is different crossover alignments, such as this article: Linkwitz-Riley Crossovers: A Primer

 

[The Camry]

What you want to look up is different crossover alignments, such as this article: Linkwitz-Riley Crossovers: A Primer

So what im seeing is its all slope dependent. diff slopes give bumps/drops.

 

[trumpet 5,000+ posts]

What matters in the car is how rapidly the power drops off and the acoustical response. That's different from the electrical response.

 

[The Camry]

What matters in the car is how rapidly the power drops off and the acoustical response. That's different from the electrical response.

so too many factors to try to figure out in just theory. Best to just rta and play from there.

 

[trumpet 5,000+ posts]

so too many factors to try to figure out in just theory. Best to just rta and play from there.

The phase response matters in addition to frequency response, but an RTA measurement alone will not capture phase. Linkwitz-Riley 4th order is a good choice for your crossovers because the phase shift is less of a problem, and the rolloff characteristics mean you can pick the same corner frequency for two adjacent drivers and generally it should sound pretty good.