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Car Audio Equipment
Subwoofers
Subsonic Filter
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<blockquote data-quote="Electrodynamic" data-source="post: 3403127" data-attributes="member: 548723"><p>X3 ^^^^^</p><p></p><p>Setting the filter at the tuning frequency of your enclosure is going to limit your output at/near tuning significantly. Xovers start rolling off the response slightly before their selected frequency, as some of them try to hit the -3 dB point at the selected frequency, not begin (i.e. 0 dB) at the selected frequency. So if you have your enclosure tuned to 30 Hz, setting your subsonic filter to 25 Hz will be just fine. What you want to avoid is having your subs "unload" below tuning and start moving in excess, which can potentially damage the drivers. If you want a quick visual, open up WinISD (it's free and most people have it) and open up any driver in a ported alignment. Now take a look at the response followed by cone excursion. Notice how below tuning excursion skyrockets as SPL plunges? Setting your subsonic filter correctly eliminates the excursion demands on the subwoofer(s) below tuning and could provide you with years more service from your system.</p></blockquote><p></p>
[QUOTE="Electrodynamic, post: 3403127, member: 548723"] X3 ^^^^^ Setting the filter at the tuning frequency of your enclosure is going to limit your output at/near tuning significantly. Xovers start rolling off the response slightly before their selected frequency, as some of them try to hit the -3 dB point at the selected frequency, not begin (i.e. 0 dB) at the selected frequency. So if you have your enclosure tuned to 30 Hz, setting your subsonic filter to 25 Hz will be just fine. What you want to avoid is having your subs "unload" below tuning and start moving in excess, which can potentially damage the drivers. If you want a quick visual, open up WinISD (it's free and most people have it) and open up any driver in a ported alignment. Now take a look at the response followed by cone excursion. Notice how below tuning excursion skyrockets as SPL plunges? Setting your subsonic filter correctly eliminates the excursion demands on the subwoofer(s) below tuning and could provide you with years more service from your system. [/QUOTE]
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