hello to everyone,
i have designed a 3-way croosover for my active speaker system using minidsp (minisharc). I was just playing with the Vituixcad2 simulator and the crossover i have designed. My crossover is on the picture with the midrange inverted. I am reffering to the low-mid section. Look at the drivers delay. It seems that the woofer must be delayed by 200uS to get the deepest null. One would say that the midrange should be delayed to get that null. All the measurements that i made are 1m at the tweeter level. Now the speaker is working without any delay at the mid or low regions. the total SPL is exactly as the program simulate, so everything seems to be ok. I just thought to play with the low to mid section time aligment and found this. If i connect the input of the low section after the Mid Low pass filter, as i would do if i were to design an analog active crossover, then the midrange section is the one that should be delayed to get the same null. So if i understand correctly the two filters in series in the mid section, introduce larger total delay to the midrange section so finally the low section must be delayed? I suppose that in the minidsp the logic is that the sections are independed between each other, as on the picture, am i right?
i have designed a 3-way croosover for my active speaker system using minidsp (minisharc). I was just playing with the Vituixcad2 simulator and the crossover i have designed. My crossover is on the picture with the midrange inverted. I am reffering to the low-mid section. Look at the drivers delay. It seems that the woofer must be delayed by 200uS to get the deepest null. One would say that the midrange should be delayed to get that null. All the measurements that i made are 1m at the tweeter level. Now the speaker is working without any delay at the mid or low regions. the total SPL is exactly as the program simulate, so everything seems to be ok. I just thought to play with the low to mid section time aligment and found this. If i connect the input of the low section after the Mid Low pass filter, as i would do if i were to design an analog active crossover, then the midrange section is the one that should be delayed to get the same null. So if i understand correctly the two filters in series in the mid section, introduce larger total delay to the midrange section so finally the low section must be delayed? I suppose that in the minidsp the logic is that the sections are independed between each other, as on the picture, am i right?
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Nulls have questionable meaning and they can be misleading, so looking at them is not something you should be doing if you have phase to look at instead.
Hi Allen , yes i know but the phase chart seems to be ok. this is the drivers phase without any driver invertion. It is just a little strange that i must delay the low section and not the mid one. acoustically i cannot tell any difference with or without the delay in the low section. But you can clearly hear the difference if the tweeter delay is removed.
