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<blockquote data-quote="T3mpest" data-source="post: 6851319" data-attributes="member: 560148">That&#039;s a bad myth this forum started.&nbsp; Along with clipping magically killing amplifiers.&nbsp; (300 clipped watts and 300 clean watts will kill a speaker equally fast, power under the curve is ALL that matters).&nbsp;&nbsp; Anyway, if both subs are moving in and out at the same time they wont&#039; inherently cancel each other out any more than subs of the same sizes would.&nbsp; The main issue is that each sub needs different airspace to get the same frequency response and that makes it very hard to tune.&nbsp; That still makes it a bad idea unless you have an EQ and an RTA handy to fix your frequency response when you done.&nbsp; If you can do that, in a sealed scenario it&#039;s often not a bad idea in a pinch to fit in what you can and just EQ the issues that come up out of it.&nbsp; In a good setup multiple subs of different sizes still aren&#039;t needed, just saying it&#039;s not as inherently bad as some make it out to be.Anyway, I&#039;d love to let dave come listen to my fifteeens.&nbsp; If I turn off my hpf, I can basically play most of the information that is in the song &quot;one&quot; just out of my sub.&nbsp; I&#039;ve ran my AV15&#039;s on tones and they had NO issues up to about 3k by ear.&nbsp; (yes, 3000hz, tweeter territory).&nbsp; Beyond that I heard some cone breakup from having a piece of aluminum moving back and forth that fast lol.&nbsp; Point is, any sub can play that high as long as the cone is dampened enough and the voice coil has low enough inductance.&nbsp; What size woofers do you think metallica uses to play back songs on tour?&nbsp; or any band for that matter.&nbsp; In Pro audio midbasses are 15&#039;-18 and midranges are usually 12&#039;s, sometimes 15&#039;s as well.&nbsp; The best lower midranges I&#039;ve heard to date came out of an 8, PHL 2520, hopefully my BMS will sound as nice.&nbsp; In most actual SQ setups, subwoofers are big.&nbsp; The idea that 8inch subwoofers are good for SQ is a myth.&nbsp; A 8 is going to have a hard time reproducing alot of insruments at an volume level high enough to be considered accurate without stress or strain, that&#039;s far from accurate.&nbsp; If your woofer can&#039;t do 120db&#039;s at 20hz in a car, it&#039;s not great for SQ, IMO.Anyway I took a similar approach in my attempts at a SQ system that can play back at high volume levels, although my car is a little less sane than most lol.&nbsp; I&#039;ve got 2 AV15h woofers and 4 PR15&#039;s from exodus audio.&nbsp; 5 cubes at 25hz.&nbsp; Front stage is B&amp;amp;C DE500 compression drivers on full sized horn bodies and BMS 8N515 mid&#039;s for the midrange/midbass.&nbsp; Front stage should be good for about 125db&#039;s and subs about 145 (****ing cadillac trunks lol)</blockquote>

[QUOTE="T3mpest, post: 6851319, member: 560148"] That's a bad myth this forum started. Along with clipping magically killing amplifiers. (300 clipped watts and 300 clean watts will kill a speaker equally fast, power under the curve is ALL that matters). Anyway, if both subs are moving in and out at the same time they wont' inherently cancel each other out any more than subs of the same sizes would. The main issue is that each sub needs different airspace to get the same frequency response and that makes it very hard to tune. That still makes it a bad idea unless you have an EQ and an RTA handy to fix your frequency response when you done. If you can do that, in a sealed scenario it's often not a bad idea in a pinch to fit in what you can and just EQ the issues that come up out of it. In a good setup multiple subs of different sizes still aren't needed, just saying it's not as inherently bad as some make it out to be. Anyway, I'd love to let dave come listen to my fifteeens. If I turn off my hpf, I can basically play most of the information that is in the song "one" just out of my sub. I've ran my AV15's on tones and they had NO issues up to about 3k by ear. (yes, 3000hz, tweeter territory). Beyond that I heard some cone breakup from having a piece of aluminum moving back and forth that fast lol. Point is, any sub can play that high as long as the cone is dampened enough and the voice coil has low enough inductance. What size woofers do you think metallica uses to play back songs on tour? or any band for that matter. In Pro audio midbasses are 15'-18 and midranges are usually 12's, sometimes 15's as well. The best lower midranges I've heard to date came out of an 8, PHL 2520, hopefully my BMS will sound as nice. In most actual SQ setups, subwoofers are big. The idea that 8inch subwoofers are good for SQ is a myth. A 8 is going to have a hard time reproducing alot of insruments at an volume level high enough to be considered accurate without stress or strain, that's far from accurate. If your woofer can't do 120db's at 20hz in a car, it's not great for SQ, IMO. Anyway I took a similar approach in my attempts at a SQ system that can play back at high volume levels, although my car is a little less sane than most lol. I've got 2 AV15h woofers and 4 PR15's from exodus audio. 5 cubes at 25hz. Front stage is B&C DE500 compression drivers on full sized horn bodies and BMS 8N515 mid's for the midrange/midbass. Front stage should be good for about 125db's and subs about 145 (****ing cadillac trunks lol) [/QUOTE]

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