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<blockquote data-quote="djdiggla" data-source="post: 8401218" data-attributes="member: 666495">Hi, new to the forum. I have a question maybe someone can help me with.I have a <a href="http://www.ddaudio.com/products/mobile-audio/amplifiers/full-range-amplifiers/series/a4" target="_blank">DD A4 amp</a> powering my door speakers which are Kicker 40CS654 (frequency response: 40-20,000 Hz). I have the HPF set to on for both front and rear door speakers so it should filter out lower than 50Hz (and sub reproducing anything 50Hz and lower).The question I have is the what should I adjust the frequency knob to? The guy that installed it had the frequency all the way to 500Hz and so it had pretty much no mid/bass coming out--very tinny. I opened it up all the way to 50Hz but not sure if that&#039;s really the best sound quality either. I contacted DD and they said if the HPF is switched on then the frequency knob does nothing. I told them it does actually drastically affect the sound. They said, yes, it will but it just for fine tuning the sound and it doesn&#039;t really matter what it&#039;s set to. Looking for a second opinion or even to be educated on what exactly I&#039;m doing when adjusting the HPF. Any suggestions would be great. I can&#039;t find any good info on the DD website/manuals for this specific topic.Thanks!</blockquote>

[QUOTE="djdiggla, post: 8401218, member: 666495"] Hi, new to the forum. I have a question maybe someone can help me with. I have a [URL="http://www.ddaudio.com/products/mobile-audio/amplifiers/full-range-amplifiers/series/a4"]DD A4 amp[/URL] powering my door speakers which are Kicker 40CS654 (frequency response: 40-20,000 Hz). I have the HPF set to on for both front and rear door speakers so it should filter out lower than 50Hz (and sub reproducing anything 50Hz and lower). The question I have is the what should I adjust the frequency knob to? The guy that installed it had the frequency all the way to 500Hz and so it had pretty much no mid/bass coming out--very tinny. I opened it up all the way to 50Hz but not sure if that's really the best sound quality either. I contacted DD and they said if the HPF is switched on then the frequency knob does nothing. I told them it does actually drastically affect the sound. They said, yes, it will but it just for fine tuning the sound and it doesn't really matter what it's set to. Looking for a second opinion or even to be educated on what exactly I'm doing when adjusting the HPF. Any suggestions would be great. I can't find any good info on the DD website/manuals for this specific topic. Thanks! [/QUOTE]

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