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<blockquote data-quote="El Ropo" data-source="post: 2160796" data-attributes="member: 561863">The subwoofer output of the newer Alpine HUs has to be turned almost all the way up in order to achieve a decently high voltage ouput.Have you tried turning up the sub volume on the HU?&nbsp; Say, +13 out of +15?&nbsp; The highest should be +15 if I remember correctly..FWIW, at volume 25 out of 35, there really should be no distortion issues, unless you are running speakers off the HU&#039;s power.&nbsp; External amps should be gain adjusted so that 25 is within a safe operating range(no clipping).I would choose which xover you&#039;re going to use, either the one on the HU, or the one on the amp, and go with it.&nbsp;&nbsp; I personally prefer using the HU xover because I can adjust it on the fly.The current xover point seems quite high to me, I&#039;d try closer to 100 hz, maybe even 80, depending on what sub setup you&#039;re using, how much power, what type of box, what type of car, etc.</blockquote>

[QUOTE="El Ropo, post: 2160796, member: 561863"] The subwoofer output of the newer Alpine HUs has to be turned almost all the way up in order to achieve a decently high voltage ouput. Have you tried turning up the sub volume on the HU? Say, +13 out of +15? The highest should be +15 if I remember correctly.. FWIW, at volume 25 out of 35, there really should be no distortion issues, unless you are running speakers off the HU's power. External amps should be gain adjusted so that 25 is within a safe operating range(no clipping). I would choose which xover you're going to use, either the one on the HU, or the one on the amp, and go with it. I personally prefer using the HU xover because I can adjust it on the fly. The current xover point seems quite high to me, I'd try closer to 100 hz, maybe even 80, depending on what sub setup you're using, how much power, what type of box, what type of car, etc. [/QUOTE]

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