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Message: <blockquote data-quote="hi1983" data-source="post: 1440450" data-attributes="member: 28803">hi, i just share, however i din say crossover slope are related with non-directional frequency,?? what you mean, directional frequency is 60-80 hz base on diffrence people feel, however why put very step slope is to eliminate the higher frequency to produce behind at the car boot from subwoofer.. i mean this, for up front bass. since on only with 12db slop @ 80hz at subwoofer, there are still about 1/2 level of sound produce at 120hz from subwoofer, and 1/4 @ 160hz.becos altough put at crossover point of 80 or 60hz, they still have level of higher frequency produce by subwoofer.and ur remark of sub-sonic filter on subs are out of place, sorry don understand what you mean.for class D amplifier question, what i say is the class D for speaker is not as good as normal AB on soundquality, this most ppl knows. i say for higher hertz produce , but class D is best on power. if you think is wrong pls share some idea. hi, we are sharing knowledge, although some may wrong,</blockquote>

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