Crossover and Polarity?
Ok,
I've been surfing around different sites and came across this on Dave Rats site about crossover.
Xovers do not reach their full phase shift till considerably outside the pass band.
So you will see a fraction (perhaps 1/2 the phase shift depending on filter type) at the x-over point where both low and high drivers are putting out equal levels. That is the point where you will have maximum interaction between the low and high outputs.
Even though a 2nd order filter is 'in polarity' in the passbands, the cancellation at the X-Over point typically requires a polarity invert.
Typically, with 12 db per octave filters you will get noticeable cancellation at the x-over point unless you reverse HF or LF polarity.
Does this mean I should be changing the polarity?
Thanks,
James R
I've been surfing around different sites and came across this on Dave Rats site about crossover.
Xovers do not reach their full phase shift till considerably outside the pass band.
So you will see a fraction (perhaps 1/2 the phase shift depending on filter type) at the x-over point where both low and high drivers are putting out equal levels. That is the point where you will have maximum interaction between the low and high outputs.
Even though a 2nd order filter is 'in polarity' in the passbands, the cancellation at the X-Over point typically requires a polarity invert.
Typically, with 12 db per octave filters you will get noticeable cancellation at the x-over point unless you reverse HF or LF polarity.
Does this mean I should be changing the polarity?
Thanks,
James R
Comments
It all depends on the speakers. some seem to need it, some don't.
probably wan't the simple cookbook answer you were looking for
I did some further browsing and found it seems to be with the 12dB filters mostly.