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<blockquote data-quote="audioholic" data-source="post: 6844544" data-attributes="member: 549629"><p>Your statements would be true if we were only discussing sealed enclosure systems. In vented systems, enclosure sensitivity plays a major role, and greatly diminishes the role of xmax while increasing the importance of power handing. When playing music at or very near enclosure tuning, excursion (xmax) is at its minimum, but enclosure efficiency is maximized. This is why the cone moves the least at tuning, but output is the greatest. Your 'xmax and cone are all that matters' theory ignores this.</p><p></p><p>Secondly, a speaker cone is similar to an engine's piston. But unlike the engine's piston, a speaker cone is not moved mechanically based on an off-center rotating shaft. A speaker is an electro-mechanical device, so simply looking at the mechanical aspects of it (xmax and cone diameter) and pretending it works just like a piston is only seeing half the over all picture. For example, you say efficiency is not important because you can always just keep increasing amplifier size until you hit full excursion potential. What happens if the coil melts before full excursion is reached? What if someone would rather reach 30mm xmax with 800 watts than it requiring 3500 watts? What if someone doesnt want to have to buy a new alternator, overly large wire, extra batts... just because they took your advice and decided efficiency was 'no big deal'? What if someone ignored efficiency when buying a sub, then realized that thanks to hoffman's iron law, they bought a sub that requires more airspace than their vehicle will allow?</p><p></p><p>You cant just look at xmax and cone area when buying a sub. That leaves way too many variables to chance.</p><p></p><p>My advice is to stick around these forums for a while and learn as much about speaker specs as possible. Read up on what theil/small specs are and how they affect speaker performance. No one speaker spec is the most important, and every one of them works in correlation with or are dependent on other specs.</p></blockquote><p></p>
[QUOTE="audioholic, post: 6844544, member: 549629"] Your statements would be true if we were only discussing sealed enclosure systems. In vented systems, enclosure sensitivity plays a major role, and greatly diminishes the role of xmax while increasing the importance of power handing. When playing music at or very near enclosure tuning, excursion (xmax) is at its minimum, but enclosure efficiency is maximized. This is why the cone moves the least at tuning, but output is the greatest. Your 'xmax and cone are all that matters' theory ignores this. Secondly, a speaker cone is similar to an engine's piston. But unlike the engine's piston, a speaker cone is not moved mechanically based on an off-center rotating shaft. A speaker is an electro-mechanical device, so simply looking at the mechanical aspects of it (xmax and cone diameter) and pretending it works just like a piston is only seeing half the over all picture. For example, you say efficiency is not important because you can always just keep increasing amplifier size until you hit full excursion potential. What happens if the coil melts before full excursion is reached? What if someone would rather reach 30mm xmax with 800 watts than it requiring 3500 watts? What if someone doesnt want to have to buy a new alternator, overly large wire, extra batts... just because they took your advice and decided efficiency was 'no big deal'? What if someone ignored efficiency when buying a sub, then realized that thanks to hoffman's iron law, they bought a sub that requires more airspace than their vehicle will allow? You cant just look at xmax and cone area when buying a sub. That leaves way too many variables to chance. My advice is to stick around these forums for a while and learn as much about speaker specs as possible. Read up on what theil/small specs are and how they affect speaker performance. No one speaker spec is the most important, and every one of them works in correlation with or are dependent on other specs. [/QUOTE]
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