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theorhetical vs. application
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<blockquote data-quote="CBFryman2" data-source="post: 2455579" data-attributes="member: 565445"><p>Let's first analyze where these come from.</p><p></p><p>a.) This is Theoretical anecho at best. When you double displacement YES! in fact you do gain 3db...but in a scence that you add another woofer you also halv over all system efficency off of a given power. This, in theory, would mean that you gain 0dB but we know that not to be true. With the same exact power (which is impossible with most amplifiers) you could gain 2-3dB usually. Which is a mild to moderate increase in loudness. Because doubleing woofers means halving impeadance (when wired in parallel) it oculd be 9dB or more...which is doubleing loudness.</p><p></p><p>b.) Porting the box, in theory anecho will gain an AVERAGE of 3dB over the entire banwith. This is theoredical anecho. Put the box in a cabbin and apply real power to it and realize that in a subwoofer application you are operating with in an octave of the tuning frequincy most of the time and you are looking a a 3-9dB gain over all and as much as a 12dB gain in your peak. Realize I said AS MUCH, and agian these are big generalizations. THey are also anecho. In car it could be the same or it could be even more or even less.</p><p></p><p>c.) Double power does, in theory, double displacement and there for gain 3dB. However...realize that doubleing power could raise the voltage enough to push past the inductance...the more voltage you apply the lower the effects of inductance have on the impeadance... You could also run into power compression problems when you double power. 1w to 2w this will hold true. 1000w to 2000w you may gain 3db, 5dB, 1dB, 0.5dB. Entirely application dependant.</p><p></p><p>Going from a single 12" in a sealed enclosure to two 12's in a ported enclosure with twice the power could yeild 6dB or it could yeild a whopping 20dB+ which is 4 times as loud.</p><p></p><p>All of thoes are generalizations refering to an anecho environment. Real woofers with real power in a real vehicle is another story. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif</p></blockquote><p></p>
[QUOTE="CBFryman2, post: 2455579, member: 565445"] Let's first analyze where these come from. a.) This is Theoretical anecho at best. When you double displacement YES! in fact you do gain 3db...but in a scence that you add another woofer you also halv over all system efficency off of a given power. This, in theory, would mean that you gain 0dB but we know that not to be true. With the same exact power (which is impossible with most amplifiers) you could gain 2-3dB usually. Which is a mild to moderate increase in loudness. Because doubleing woofers means halving impeadance (when wired in parallel) it oculd be 9dB or more...which is doubleing loudness. b.) Porting the box, in theory anecho will gain an AVERAGE of 3dB over the entire banwith. This is theoredical anecho. Put the box in a cabbin and apply real power to it and realize that in a subwoofer application you are operating with in an octave of the tuning frequincy most of the time and you are looking a a 3-9dB gain over all and as much as a 12dB gain in your peak. Realize I said AS MUCH, and agian these are big generalizations. THey are also anecho. In car it could be the same or it could be even more or even less. c.) Double power does, in theory, double displacement and there for gain 3dB. However...realize that doubleing power could raise the voltage enough to push past the inductance...the more voltage you apply the lower the effects of inductance have on the impeadance... You could also run into power compression problems when you double power. 1w to 2w this will hold true. 1000w to 2000w you may gain 3db, 5dB, 1dB, 0.5dB. Entirely application dependant. Going from a single 12" in a sealed enclosure to two 12's in a ported enclosure with twice the power could yeild 6dB or it could yeild a whopping 20dB+ which is 4 times as loud. All of thoes are generalizations refering to an anecho environment. Real woofers with real power in a real vehicle is another story. [IMG]//content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif[/IMG] [/QUOTE]
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