As we all known, theoretically, the second-order crossover requires reversing polarity of one driver to fix the 180 degrees out of phase between two drivers. However, there are many designs utilizing second-order crossovers with no reversing polarity on one driver. A simple answer (or the reason) for this performing could be the “measurements” don’t find the out of phase issue, so there’s no need any polarity reversal.
Nevertheless, that decision was based on “measurements”, what if we have no measurements, can we know when to reverse or not reverse polarity?
A study case, I found some manufacturers; ADS and Braun, made three-way speakers. It’s interesting that they use the SAME crossover topology on ALL models in the same series. That is second-order on all sections of crossover. And the most interesting thing is that the polarities of all drivers in all models seem to be FIXED; woofer(s) = positive, midrange = positive, and tweeter = negative. Or, in brief, non-reverse polarity between woofer(s) and midrange, and reverse polarity between midrange and tweeter.
I suspect if they MIGHT fix the polarities, by using the cited pattern, before setting crossover’s component values. If so, that should mean they know phase behavior before, or maybe the measurements aren’t that important, isn’t it possible? Again, if so, how can we predict phase behaviors, like them, i.e., what are criteria for reversing polarity or not without making measurements?
PS. I have no problems with measurements and I use a lot of measurements as well, but, just curious if we can shorten the procedures as there exists a thread advising how to build speakers without measurements—very good thread indeed.
Nevertheless, that decision was based on “measurements”, what if we have no measurements, can we know when to reverse or not reverse polarity?
A study case, I found some manufacturers; ADS and Braun, made three-way speakers. It’s interesting that they use the SAME crossover topology on ALL models in the same series. That is second-order on all sections of crossover. And the most interesting thing is that the polarities of all drivers in all models seem to be FIXED; woofer(s) = positive, midrange = positive, and tweeter = negative. Or, in brief, non-reverse polarity between woofer(s) and midrange, and reverse polarity between midrange and tweeter.
I suspect if they MIGHT fix the polarities, by using the cited pattern, before setting crossover’s component values. If so, that should mean they know phase behavior before, or maybe the measurements aren’t that important, isn’t it possible? Again, if so, how can we predict phase behaviors, like them, i.e., what are criteria for reversing polarity or not without making measurements?
PS. I have no problems with measurements and I use a lot of measurements as well, but, just curious if we can shorten the procedures as there exists a thread advising how to build speakers without measurements—very good thread indeed.
