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<blockquote data-quote="keep_hope_alive" data-source="post: 7508038" data-attributes="member: 576029">I agree with Zako.Time alignment for a subwoofer is minimally important, and really depends on the LPF.&nbsp; Getting speakers in acoustic phase first requires the wave is fully developed. 50Hz has a wavelength of 22.5 ft.&nbsp; It will not develop inside the car.&nbsp; Even 100Hz with a 11.5 ft wavelength will not be developed.&nbsp; T/A has little to no benefit here. If anything, you are aligning the harmonics. Polarity, or just making sure all drivers are moving in the same direction relative to the listener, is important since we are basically pressurizing the cabin.&nbsp; Bass is lost when some drivers push out and others pull in.&nbsp; This is not the same as time arrival cancellation, but instead just pressurization cancellation (if such a term exists).*assumes 1125 ft/sec for speed of soundMid bass arrival times can matter, but it is a function of ITD and PLD.&nbsp; Given the choice to T/A a component set with passive crossovers, split the difference or base it on the woofer.Many tweeter problems are diffraction based and not fixed by T/A anyway.Driver placement and aiming, enclosure construction, and crossover point/slope play the largest role in how a speaker system will sound.&nbsp; This is true for home, pro, or car audio.</blockquote>

[QUOTE="keep_hope_alive, post: 7508038, member: 576029"] I agree with Zako. Time alignment for a subwoofer is minimally important, and really depends on the LPF. Getting speakers in acoustic phase first requires the wave is fully developed. 50Hz has a wavelength of 22.5 ft. It will not develop inside the car. Even 100Hz with a 11.5 ft wavelength will not be developed. T/A has little to no benefit here. If anything, you are aligning the harmonics. Polarity, or just making sure all drivers are moving in the same direction relative to the listener, is important since we are basically pressurizing the cabin. Bass is lost when some drivers push out and others pull in. This is not the same as time arrival cancellation, but instead just pressurization cancellation (if such a term exists). *assumes 1125 ft/sec for speed of sound Mid bass arrival times can matter, but it is a function of ITD and PLD. Given the choice to T/A a component set with passive crossovers, split the difference or base it on the woofer. Many tweeter problems are diffraction based and not fixed by T/A anyway. Driver placement and aiming, enclosure construction, and crossover point/slope play the largest role in how a speaker system will sound. This is true for home, pro, or car audio. [/QUOTE]

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