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<blockquote data-quote="mrclean636" data-source="post: 8091476" data-attributes="member: 636269">My input:1. 43Hz is their tuning for max &quot;SPL&quot; on the meter. For street beating. you can always tune lower, ideally to your favorite area. You have to make sure that the subsonic filter on the amplifier is set, around your tuning frequency, you don&#039;t want it all the way down or off. If your Rockford Fosgate amp is like the rest then there should be a &quot;infrasonic filter&quot; with an on and off setting, this is Rockford&#039;s &quot;subsonic filter&quot;. If the box is ported you definitely should have that on, it sets the filter to 27Hz I believe.2. Now... you can bottom out a sub multiple ways. Too big of a box, too much power, no subsonic, poor tuning, distortion (which causes a smelly sub), etc. Let&#039;s say you listen to music that has notes of 40Hz, and your box is tuned to 35Hz, you will have no problem playing that note at high volume. Now if you were to have a song that has notes of 25Hz, and your box is tuned to 35Hz, you risk bottoming out the sub. A subsonic filter helps prevent that but only so far. The lower Hz tracks generally cause more excursion on the sub and having the volume cranked can cause stability problems with the motor.3. You should really tune the amp with an oscope of DD-1 next time, if you didn&#039;t this time. It will allow you to set the max un-distorted gain on the amplifier. That way you know you aren&#039;t clipping the sub. But if you play some ****** slowed and boosted youtube song rip, at like 96kbps, you are going to clip. If you smell the sub, you have already done damage, turn it down.I hope your sub is under warranty btw, that *****, this whole hobby is a learning experience from day 1. No one knew everything at the start!</blockquote>

[QUOTE="mrclean636, post: 8091476, member: 636269"] My input: 1. 43Hz is their tuning for max "SPL" on the meter. For street beating. you can always tune lower, ideally to your favorite area. You have to make sure that the subsonic filter on the amplifier is set, around your tuning frequency, you don't want it all the way down or off. If your Rockford Fosgate amp is like the rest then there should be a "infrasonic filter" with an on and off setting, this is Rockford's "subsonic filter". If the box is ported you definitely should have that on, it sets the filter to 27Hz I believe. 2. Now... you can bottom out a sub multiple ways. Too big of a box, too much power, no subsonic, poor tuning, distortion (which causes a smelly sub), etc. Let's say you listen to music that has notes of 40Hz, and your box is tuned to 35Hz, you will have no problem playing that note at high volume. Now if you were to have a song that has notes of 25Hz, and your box is tuned to 35Hz, you risk bottoming out the sub. A subsonic filter helps prevent that but only so far. The lower Hz tracks generally cause more excursion on the sub and having the volume cranked can cause stability problems with the motor. 3. You should really tune the amp with an oscope of DD-1 next time, if you didn't this time. It will allow you to set the max un-distorted gain on the amplifier. That way you know you aren't clipping the sub. But if you play some ****** slowed and boosted youtube song rip, at like 96kbps, you are going to clip. If you smell the sub, you have already done damage, turn it down. I hope your sub is under warranty btw, that *****, this whole hobby is a learning experience from day 1. No one knew everything at the start! [/QUOTE]

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