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<blockquote data-quote="fly_marlin" data-source="post: 8426817" data-attributes="member: 660781">It&#039;s important that every single setting be set so that you know exactly what it is. You&#039;ll need to pull the amps out and make sure:1. LPF on the alpine is set to the highest possible setting. Also, it has a bass eq with 50Hz center frequency (800Hz is not a sub frequency) -bumping that up a bit should helpwith the thump you&#039;re looking for.2. Set all x-overs on the JL to full, then you can manage them from the deck.There&#039;s just not a way around it, you have to pull the amps out. Otherwise, whatever box/sub you slap in there will be lacking. I see the alpine has a non-adjustable subsonic filter at 15Hz. Not sure if you can, but see if you can do a bandpass on your deck (LPF and HPF for the sub). So that you can cut off even more of the lower frequencies. 15Hz is too low for your box and musical taste.Once you do the above with the amps, we can start messing with the deck.</blockquote>

[QUOTE="fly_marlin, post: 8426817, member: 660781"] It's important that every single setting be set so that you know exactly what it is. You'll need to pull the amps out and make sure: 1. LPF on the alpine is set to the highest possible setting. Also, it has a bass eq with 50Hz center frequency (800Hz is not a sub frequency) - bumping that up a bit should help with the thump you're looking for. 2. Set all x-overs on the JL to full, then you can manage them from the deck. There's just not a way around it, you have to pull the amps out. Otherwise, whatever box/sub you slap in there will be lacking. I see the alpine has a non-adjustable subsonic filter at 15Hz. Not sure if you can, but see if you can do a bandpass on your deck (LPF and HPF for the sub). So that you can cut off even more of the lower frequencies. 15Hz is too low for your box and musical taste. Once you do the above with the amps, we can start messing with the deck. [/QUOTE]

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