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<blockquote data-quote="Savant" data-source="post: 148991" data-attributes="member: 546108">You can head to partsexpress.com and get some FMOD inline filters.. they go on the RCA cables before the amp(s) (I&#039;d suggest putting it inline before your first split).. You can get LPF (low pass filters) and cut off all freqs above a certian spot.. that will remove the top stuff..Also, YES.. they make head units that have &#039;sub-woofer&#039; outputs (only non-fading in some cases).. the Alpine I just got even has a built in LPF for the subs, changeable at 160-something-something-60 (not sure what they are, look up the specs, CDA 7892)..You can also get those FMODs for each amp to tweek stuff.. I have a 20 HPF for my 12&quot;s and have the amplifier&#039;s crossover set to ~60 Hz.. then I have a 70 HPF for my 10&quot;s and the HU cuts off at ~160..FMODs are like $25 for a pair (one for each channel)..To the other guy, you can use that as a sub-sonic filter as well.. get a 20 HPF for the RCAs..Course, this all goes out the window if you are running speaker level inputs to your amplifiers and not RCA pre-amp outputs.. then you need crossovers that will handle high level input, and those aren&#039;t cheap for ones that handle decent power.. better to clean the singal on RCA cables..</blockquote>

[QUOTE="Savant, post: 148991, member: 546108"] You can head to partsexpress.com and get some FMOD inline filters.. they go on the RCA cables before the amp(s) (I'd suggest putting it inline before your first split).. You can get LPF (low pass filters) and cut off all freqs above a certian spot.. that will remove the top stuff.. Also, YES.. they make head units that have 'sub-woofer' outputs (only non-fading in some cases).. the Alpine I just got even has a built in LPF for the subs, changeable at 160-something-something-60 (not sure what they are, look up the specs, CDA 7892).. You can also get those FMODs for each amp to tweek stuff.. I have a 20 HPF for my 12"s and have the amplifier's crossover set to ~60 Hz.. then I have a 70 HPF for my 10"s and the HU cuts off at ~160.. FMODs are like $25 for a pair (one for each channel).. To the other guy, you can use that as a sub-sonic filter as well.. get a 20 HPF for the RCAs.. Course, this all goes out the window if you are running speaker level inputs to your amplifiers and not RCA pre-amp outputs.. then you need crossovers that will handle high level input, and those aren't cheap for ones that handle decent power.. better to clean the singal on RCA cables.. [/QUOTE]

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