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How do I install for the lowest of the lows?
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<blockquote data-quote="MrBill2U" data-source="post: 767530" data-attributes="member: 553080"><p>Ports just give a boost at a particular frequency. Whatever frequency you choose is what the box is "tuned" for. In home and pro audio applications it is normally tuned to allow your response curved to stay flat to a deeper tone. For example, if your sub would normally be flat down to around 60 hz, then starts falling off and is 6db down at 30 Hz a port might be used at 30 Hz to give the tone a boost in that are making your sub flat down to 30 Hz. First instinct for most is to say "sweet, I will just tune my box down to 20Hz and make anything play down that low!!" It does not work that way unfortunately. You don't want to go very far down below the resonant frequency of your sub or you get really funny looking curves.... man I wish I had a picture of the response from a 6.5" woofer in a large sealed enclosure tuned to 20 hz... funny indeed. SPL competitors will often use ports tuned not to give flat response, but to overexagerate one particular tone. The best "flat response" port for that tuning may be 36 Hz, but they will tune the port up to 60 Hz (or near whatever the resonant freq of the car is) to make those few notes LOUD.</p></blockquote><p></p>
[QUOTE="MrBill2U, post: 767530, member: 553080"] Ports just give a boost at a particular frequency. Whatever frequency you choose is what the box is "tuned" for. In home and pro audio applications it is normally tuned to allow your response curved to stay flat to a deeper tone. For example, if your sub would normally be flat down to around 60 hz, then starts falling off and is 6db down at 30 Hz a port might be used at 30 Hz to give the tone a boost in that are making your sub flat down to 30 Hz. First instinct for most is to say "sweet, I will just tune my box down to 20Hz and make anything play down that low!!" It does not work that way unfortunately. You don't want to go very far down below the resonant frequency of your sub or you get really funny looking curves.... man I wish I had a picture of the response from a 6.5" woofer in a large sealed enclosure tuned to 20 hz... funny indeed. SPL competitors will often use ports tuned not to give flat response, but to overexagerate one particular tone. The best "flat response" port for that tuning may be 36 Hz, but they will tune the port up to 60 Hz (or near whatever the resonant freq of the car is) to make those few notes LOUD. [/QUOTE]
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How do I install for the lowest of the lows?
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