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Message: <blockquote data-quote="zako" data-source="post: 7980378" data-attributes="member: 629735">You need subsonic filter for extra excursion control if you use a ported enclosure. In a lot of cases, the usual "high pass" filter that you see on most amplifiers is good enough to be used as a subsonic filter. The difference is that subsonic filter goes down to like 15Hz, while the high pass normally goes down to "only" 20Hz. I personally see no issue with setting subsonic filter no lower than 20Hz. That's an inaudible frequency, and much music does not contain much content below 30Hz anyways. If box tuning frequency is at 30 Hz or higher, you may actually _have_ to use a higher subsonic filter frequency in some cases.As for remote bass control, it's not necessary, unless your head unit does not have a subwoofer volume control. If you need subwoofer remote, then the mono block is more likely to have it.</blockquote>

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