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<blockquote data-quote="PV Audio" data-source="post: 6538333" data-attributes="member: 554493">Without sounding harsh, excess flexing really only impresses people who don&#039;t actually care about the audio quality. All that flexing is doing is the car absorbing the sound energy. The more flexing that&#039;s happening, the more output you&#039;re losing. At least in home audio, it is one of the least desired things for a room to have, since if the room&#039;s walls are vibrating significantly, they will be out of phase with the speaker and will cause terrible coloration of the sound. You&#039;ve heard the term standing waves? Well, the standing wave is a wave that just sits in place and oscillates. That causes any note at that frequency to continue to resonate within the enclosure, which causes peaks and valleys in your output response. In an undamped enclosure, that causes the walls to vibrate significantly at that frequency which also colors the sound significantly. That&#039;s why you use damping materials on the inside whether it&#039;s physical wood bracing, fiberglass, Dacron, wool, whatever. They turn the sound energy of the standing waves into heat which causes them to dissipate quickly. The physical bracing just prevents the walls from flexing altogether from the energy produced by the driver. All of these things whether it&#039;s sheer panel vibration due to excess energy, standing waves or poor room construction are completely undesirable. Take a look at this:<img src="http://members.ii.net/~reality/lsk/floating-spikes.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />I trust you&#039;ve seen those spikes on speakers and subwoofers before. What are they for? They&#039;re for exactly what I&#039;m talking about. They isolate the speaker cabinet from the floor so that any vibrations caused by the cabinet are not transferred to the floor which would also vibrate and cause interference. Using spikes can clean up your bass response because you don&#039;t have 10 dozen vibrating surfaces instead of just the 6 on the enclosure and the speaker. More vibration adds coloration, and you don&#039;t want that. When it&#039;s actually flexing, the issue is compounded significantly. People add deadening to doors for this reason: by adding mass to the door, you&#039;re lowering the resonant frequency of the door panel, thus making it less susceptible to vibration from audio frequencies.</blockquote>

[QUOTE="PV Audio, post: 6538333, member: 554493"] Without sounding harsh, excess flexing really only impresses people who don't actually care about the audio quality. All that flexing is doing is the car absorbing the sound energy. The more flexing that's happening, the more output you're losing. At least in home audio, it is one of the least desired things for a room to have, since if the room's walls are vibrating significantly, they will be out of phase with the speaker and will cause terrible coloration of the sound. You've heard the term standing waves? Well, the standing wave is a wave that just sits in place and oscillates. That causes any note at that frequency to continue to resonate within the enclosure, which causes peaks and valleys in your output response. In an undamped enclosure, that causes the walls to vibrate significantly at that frequency which also colors the sound significantly. That's why you use damping materials on the inside whether it's physical wood bracing, fiberglass, Dacron, wool, whatever. They turn the sound energy of the standing waves into heat which causes them to dissipate quickly. The physical bracing just prevents the walls from flexing altogether from the energy produced by the driver. All of these things whether it's sheer panel vibration due to excess energy, standing waves or poor room construction are completely undesirable. Take a look at this: [IMG]http://members.ii.net/~reality/lsk/floating-spikes.jpg[/IMG] I trust you've seen those spikes on speakers and subwoofers before. What are they for? They're for exactly what I'm talking about. They isolate the speaker cabinet from the floor so that any vibrations caused by the cabinet are not transferred to the floor which would also vibrate and cause interference. Using spikes can clean up your bass response because you don't have 10 dozen vibrating surfaces instead of just the 6 on the enclosure and the speaker. More vibration adds coloration, and you don't want that. When it's actually flexing, the issue is compounded significantly. People add deadening to doors for this reason: by adding mass to the door, you're lowering the resonant frequency of the door panel, thus making it less susceptible to vibration from audio frequencies. [/QUOTE]

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