I am speaking of 1st order crossover network although I am also interested in the acoustic slope too.
Curmudgdeon you say But how does this affect the off axis response?
First, I'd refer you to Vance Dickason's most excellent Cookbook.
If the mid/tweet voice coils are vertically aligned (or more accurately, the sound sources) there will be a -15 degree slope of the smoothest axis. Hence the tilt back of some speaker systems. .
In an electrical engineering class, a first order highpass plus first order lowpass sum more perfectly than steeper slopes.
In real life with real drivers, it just doesn't work that way because the drivers have some inherent phase and magnitude changes versus frequency.
If you read Vance's book enough, and read other posts in threads with "crossover" in the title, what you'll find is that you have to really measure the drivers and make a kind of empirical design. All that theoretical stuff is great as a background to understand what is going on, and maybe useful for electronic crossovers, but doesn't apply well with real drivers.
I completely agree. Having said that, first order design is generally a lot easier. What many get wrong is driver selection. This IMHO is the single most important part of loudspeaker design. Get this right and everything falls into place. Get it wrong and you spend lots of time and lots of money making the crossover tame the drivers.
Hmm, I was a tad hasty on the figure, which merely demonstrates two cases with the acoustic centers non-aligned, and two (not one) aligned, one with a stepped baffle, and one with a tilted baffle.Hi Mate, I have the fifth edition but let us see if we can agree on this. From what you have said the answer in your book may be in 7.10. Compare A,B,C, and D. The only diagram with acoustic centres on the same plane is C. This is why most quality speakers with 1st order slopes use a stepped baffle.
The question should not be write in these terms. It is not a competition between them. You use a n order crossover because it is required.can someone explain the advantages?
You use a n order crossover because it is required.