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Message: <blockquote data-quote="Kyle_Keating" data-source="post: 3757099" data-attributes="member: 582385">xmax standards are all over the board, the most honest if all mfr's simply embrassed this (but none the less inaccurate) is simply to take the coil height and subtract the gap height and the divide by two (overhung) or do the reverse of that for the underhung. This works better for overhung because it has better behavior as the coil leaves the gap (the current sky rockets in an underhung motor when it leaves the gap and the EMF drops and it accelerates the voice coil out causing an oil can effect that has lots of distortion (its bad to over driver underhung drivers), but underhung drivers have a higher total linear stroke. The total linear stroke would only a few % BL deviation and standard overhung drivers wouldn't even be beyond a few mm each way before they start to drop off in BL, some are better than others of course. The linear drivers work to correct that of course, there are a few different well known types i wont dive into right now...total usable thrown is a useless figure but is more or less a mechanical limt you hope never to reach! By the time you go beyond xmax for any driver, you're into not only audible distortion, but heavily reduced sensitivity and compression. In other words, you may have pour multiple times the mount a power simply to get a little more SPL and it will be very non-linear and distorted. Now of course, the system itself will heavily affect how much SPL and displacement you can get given an mount of voltage at a given frequency, but basically you don't want to go beyond xmax, in theory even for SPL contests, but of course thats not always practical or possible when even 0.1dB makes a difference! Best to give it the extra power and break something //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif</blockquote>

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