I've heard that when crossing over from car woofers/midranges to subs to try to go as low as possible, like 80 hz. Why though? Personally, I'm planning on installing small 6.5 subwoofers in the rear doors and I feel like a higher crossover point such as 120 hertz would be more appropriate because the subs would be more suited to handle 80-120 hertz, right? Plus, wouldn't the woofers/midranges be able to play cleaner? Or am I making the wrong assumptions?
In a car, a woofer can produce a peak at about 100Hz that sounds awful. I generally set the bass at about 80-90Hz and the highs at about 120 as starting points. Most all crossovers nowadays are electronic and infinitely adjustable so if those numbers aren't quite right a quick adjustment gets you what you prefer.
So if it produces an awful peak at 100 hertz, wouldn't you want to crossover higher though to avoid the peak?
You want the crossover point below the problem range so that little power is driven to the woofer in that range. For a subwoofer, the speaker plays from the crossover point and below.
Oh I see, sorry my bad, that makes more sense now, I didn't know you meant subwoofer by woofer haha