Rainbow Profi Kick Bass .... explained ( for better mid-bass )

[Thnking 10+ year member]

I agree with Manny on his point about phase relationship and how crossover affects the need for its adjustment.
I am no where near Blue or Manny's experience level when it comes to tuning but I know two things.

1. I use beefy Rainbow mids (not "kickbass" models though) and they are crossed over at the same point as the sub is. Having them out of phase with each other has resulted in a much better frequency response and lack of sub point source location. With the levels set correctly, there is a near seamless interactions between the two - markedly better than I have heard, in my limited experience with high end mids.

2. The Pioneer 880prs will automatically reverse the phase between the mids and the subs if you perform the autoEq function and have them both crossed over at the same point. Why? Because it works better most of the time that way.

I really don't understand how Thnking can get away with saying "Phase coherency over pass bands between the mid-bass to subwoofer are very very rarely problematic".

I can say it because it’s true. I very much doubt you can localize a sub, assuming the -16 or -18db point is around 250hz, you can probably localize the resonances of the surroundings.

As far as phase reversal, you’re probably able to better localize the midrange/treble when you have it properly aligned with the tweeters or just simply due to your setup. You’re probably confusing the lack of localization with being able to localize the sub as you switch phase. There’s no way to know for certain without analyzing your system.

 

[T3mpest 10+ year member]

I can say it because it’s true. I very much doubt you can localize a sub, assuming the -16 or -18db point is around 250hz, you can probably localize the resonances of the surroundings. As far as phase reversal, you’re probably able to better localize the midrange/treble when you have it properly aligned with the tweeters or just simply due to your setup. You’re probably confusing the lack of localization with being able to localize the sub as you switch phase. There’s no way to know for certain without analyzing your system.

Very true, many times when people can localize a sub they are hearing resonance of surrounding objects in the rear. If a vehicle is very well dampened you can acutually get way with 80hz at 24db/octave sometimes, my cutlass worked that way anyway, no localization at all. (haven't tried my ford yet, ugh, ford+deading.......)//content.invisioncic.com/y282845/emoticons/uhoh.gif.c07307dd22ee7e63e22fc8e9c614d1fd.gif