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Not understanding active on HU's
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<blockquote data-quote="mvw2" data-source="post: 3558026" data-attributes="member: 574722"><p>I don't think dtavano was talking about a full active setup, just the low pass/high pass filter used between the full range speakes and subwoofer.</p><p></p><p>The LPF/HPF on the HU or amp both serve the same purpose. It really doesn't matter which one you use.</p><p></p><p>Generally the HU will have either 2 sets or 3 sets of RCAs</p><p></p><p>Front - Highs</p><p></p><p>Rear - Sub</p><p></p><p>or</p><p></p><p>Front - Highs</p><p></p><p>Rear - Highs</p><p></p><p>Sub - Sub</p><p></p><p>By highs I mean full range speakers in general, everything above the crossover point.</p><p></p><p>Using the HU one, it will throw everything above the crossover point to the full range speakers(Highs) and everything below the crossover point to the Sub output.</p><p></p><p>For example, if you pick 120Hz on the HU. Your HU has just 2 pairs of RCA outs, just Front and Rear. It will send everything above 120Hz out the Front RCAs as well as the Front speaker output wires. It will send everything below 120Hz to the Rear RCAs and Rear speaker output wires.</p><p></p><p>The amp does not split both frequencies as it only has one output. If you pick LPF on the sub amp and set it to 120Hz, it will output everything below 120Hz to the subwoofer. However, it does nothing with everything above 120Hz and has no control over your full range speakers as they are not hooked up to the amp.</p><p></p><p>Now if you had a 4 channel amp using Ch 1 and Ch 2 to power the full range speakers and Ch 3 and Ch 4 to power the subwoofer, you have two LPF/HPF crossovers built in, one for Ch 1 &amp; 2 and one for Ch 3 &amp; 4. You would set the Ch 1 &amp; 2 filter to HPF and set to 120Hz. This sends everything above 120Hz to the full range speakers. Then you set the Ch 3 &amp; 4 filter to LPF and 120Hz. This sends 120Hz and down out Ch 3 &amp; 4 to the subwoofer.</p><p></p><p>One some higher end HUs and even some amps, the crossover slope is adjustable, but most amps and entry/mid level HUs are all the same.</p><p></p><p>For the most part, it doesn't matter what you use.</p><p></p><p>-Low pass filter(LPF) passes everything below the choosen crossover frequency to the speaker, passes everything below the frequency to the speaker.</p><p></p><p>-High pass filter(HPF) passes everything above the choosen crossover frequency to the speaker, passes everything above the frequency to the speaker.</p></blockquote><p></p>
[QUOTE="mvw2, post: 3558026, member: 574722"] I don't think dtavano was talking about a full active setup, just the low pass/high pass filter used between the full range speakes and subwoofer. The LPF/HPF on the HU or amp both serve the same purpose. It really doesn't matter which one you use. Generally the HU will have either 2 sets or 3 sets of RCAs Front - Highs Rear - Sub or Front - Highs Rear - Highs Sub - Sub By highs I mean full range speakers in general, everything above the crossover point. Using the HU one, it will throw everything above the crossover point to the full range speakers(Highs) and everything below the crossover point to the Sub output. For example, if you pick 120Hz on the HU. Your HU has just 2 pairs of RCA outs, just Front and Rear. It will send everything above 120Hz out the Front RCAs as well as the Front speaker output wires. It will send everything below 120Hz to the Rear RCAs and Rear speaker output wires. The amp does not split both frequencies as it only has one output. If you pick LPF on the sub amp and set it to 120Hz, it will output everything below 120Hz to the subwoofer. However, it does nothing with everything above 120Hz and has no control over your full range speakers as they are not hooked up to the amp. Now if you had a 4 channel amp using Ch 1 and Ch 2 to power the full range speakers and Ch 3 and Ch 4 to power the subwoofer, you have two LPF/HPF crossovers built in, one for Ch 1 & 2 and one for Ch 3 & 4. You would set the Ch 1 & 2 filter to HPF and set to 120Hz. This sends everything above 120Hz to the full range speakers. Then you set the Ch 3 & 4 filter to LPF and 120Hz. This sends 120Hz and down out Ch 3 & 4 to the subwoofer. One some higher end HUs and even some amps, the crossover slope is adjustable, but most amps and entry/mid level HUs are all the same. For the most part, it doesn't matter what you use. -Low pass filter(LPF) passes everything below the choosen crossover frequency to the speaker, passes everything below the frequency to the speaker. -High pass filter(HPF) passes everything above the choosen crossover frequency to the speaker, passes everything above the frequency to the speaker. [/QUOTE]
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