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<blockquote data-quote="ngsm13" data-source="post: 7648562" data-attributes="member: 544830">While regardless, I still agree with your process, I think that the idea of phase shift in an active setup is somewhat blown out of proportion. I think the real problem overall is the phase from an acoustic standpoint, not an electrical one. Phase problems are created by the different distances from the speakers.&nbsp; It’s normal for passive crossovers to be created with different slopes (and cut-off frequencies), from right to left to correct problems and staging. With active crossovers, phase shift is completely dependent on the circuit involved, whether it be IIR of FIR done onboard a DSP. It’s hard to get conclusive answers from manufacturer about the degree of phase shift which their devices incur. It’s important to note though, that the phase shift remains constand and does not change with respect to frequency, an effect of not having the impedance curve of the driver to deal with.In the end, is it really a huge deal? I mean, acoustically the inside of a car is a nightmare. In a car we have to consider reflections, resonances, frequency, phase, responses between all of the drivers.&nbsp; I would say there are bigger problems for signal purity than the phase changes cause by active filters.See above for a little information from my standpoint. Regardless, the process he listed is the proper order in which to address things.</blockquote>

[QUOTE="ngsm13, post: 7648562, member: 544830"] While regardless, I still agree with your process, I think that the idea of phase shift in an active setup is somewhat blown out of proportion. I think the real problem overall is the phase from an acoustic standpoint, not an electrical one. Phase problems are created by the different distances from the speakers. It’s normal for passive crossovers to be created with different slopes (and cut-off frequencies), from right to left to correct problems and staging. With active crossovers, phase shift is completely dependent on the circuit involved, whether it be IIR of FIR done onboard a DSP. It’s hard to get conclusive answers from manufacturer about the degree of phase shift which their devices incur. It’s important to note though, that the phase shift remains constand and does not change with respect to frequency, an effect of not having the impedance curve of the driver to deal with. In the end, is it really a huge deal? I mean, acoustically the inside of a car is a nightmare. In a car we have to consider reflections, resonances, frequency, phase, responses between all of the drivers. I would say there are bigger problems for signal purity than the phase changes cause by active filters. See above for a little information from my standpoint. Regardless, the process he listed is the proper order in which to address things. [/QUOTE]

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