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<blockquote data-quote="nastc1" data-source="post: 6845917" data-attributes="member: 622556">I&#039;ve got some Polk db401 in the front and db651 back. Just powered by the Alpine head unit they sound excellent. Good mids and they have a great tweeter for the highs. Either of you ever dealt with Alpines and the settings for a sub?I used to have the bass center frequency set to 200Hz @ the second lowest bandwidth. Sounded really good with my MTX thunder4202&nbsp; amp and my Infinity Kappa Perfect VQ 10&quot; SVC sub. I currently have the Infinity sub in the box(and xa1200 amp) I plan on using for the eclipse sub.&nbsp; The Kappa in the old box and mtx amp sounded really clear and got surprisingly loud at -7 bass setting(all the way down). In the new box and amp, It seems I have to have the bass set to 0 or 1 for it to be as loud as the old setup, I also changed the head unit to 80Hz bass center frequency @ the same bandwidth because it sounds better than 200Hz in this setup. How will the new eclipse sub compare to the kappa(when it was new)?I also realize my Infinity sub is probably nearing 5 years old now. But it doesn&#039;t seem to be hitting correctly anymore no matter how I fine tune the amp and head unit. There is also a slight rattle sound coming from the woofer, I&#039;ve read before that can be the glue coming off of the dust cap.When I swap out the Infinity for the Eclipse sub i&#039;ve got some really good wood glue from a guy I work with. I&#039;m going to seal the screw holes before putting in the new sub. Should I cut away the carpeting and seal from the outside? I&#039;m not sure how this is typically done, but I&#039;ve read it&#039;s recommended.</blockquote>

[QUOTE="nastc1, post: 6845917, member: 622556"] I've got some Polk db401 in the front and db651 back. Just powered by the Alpine head unit they sound excellent. Good mids and they have a great tweeter for the highs. Either of you ever dealt with Alpines and the settings for a sub? I used to have the bass center frequency set to 200Hz @ the second lowest bandwidth. Sounded really good with my MTX thunder4202 amp and my Infinity Kappa Perfect VQ 10" SVC sub. I currently have the Infinity sub in the box(and xa1200 amp) I plan on using for the eclipse sub. The Kappa in the old box and mtx amp sounded really clear and got surprisingly loud at -7 bass setting(all the way down). In the new box and amp, It seems I have to have the bass set to 0 or 1 for it to be as loud as the old setup, I also changed the head unit to 80Hz bass center frequency @ the same bandwidth because it sounds better than 200Hz in this setup. How will the new eclipse sub compare to the kappa(when it was new)? I also realize my Infinity sub is probably nearing 5 years old now. But it doesn't seem to be hitting correctly anymore no matter how I fine tune the amp and head unit. There is also a slight rattle sound coming from the woofer, I've read before that can be the glue coming off of the dust cap. When I swap out the Infinity for the Eclipse sub i've got some really good wood glue from a guy I work with. I'm going to seal the screw holes before putting in the new sub. Should I cut away the carpeting and seal from the outside? I'm not sure how this is typically done, but I've read it's recommended. [/QUOTE]

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