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Two 12" BTL's or one 15" LMS-5400?
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<blockquote data-quote="Remotia" data-source="post: 2208493" data-attributes="member: 568127"><p>Just want to make a correction here</p><p></p><p>The box volume is directly related to the Q of the driver and of course the Vas, if you look at the Q of the LMS-5400 is remarkably low, in fact it will work in a smaller box than the TC-3000 if you wanted it too, the Sensitivity is also really high for a linear driver. 88dB for the 15" is respectable for an average driver and highly respectable for a linear driver that compensates BL product for quality. 88dB is right in line with the 15” RL-p, TC-3000, TC-2000, Mag 15” and Fi Q just to name some common examples off the top of my head.</p><p></p><p>So it should perform at about the level of the TC-3000 (or anything else with a similar sensitivity) watt for watt, but able to handle much more power and have a higher xmax for deeper bass because of the huge voice coil. -And lets not forget the linear distortion advantages</p><p></p><p>The LMS-4000 is the driver that requires a very large box and more power to achieve the same SPL. the sensitivity of the 15" 4000 is around 85dB, so it takes twice the power to reach the same SPL as the 5400. It also wants to see a much larger box. The 5400 is superior but more expensive and if considerable output is not your primary goal, the 4000 could be ideal, but is generally revered at as a hometheater driver because of the box volume requirements.</p><p></p><p>As far as raw output for car audio, the TC-3000 +CP or 5200 +SP/+CP would be what I would recommend from our line. The +CP does not degrade the quality at all, it merely restricts ultimate mechanical excursion when the driver is pushed beyond its linear limits. The advantage is a much lighter moving mass and more output as a result because of higher sensitivity, but you still get a very long coil for 30mm of xmax. I recommend the +CP for car audio because of the lack of emphasis on deep bass (below 30Hz) There is really no reason for a tall rubber surround if you are going with a high tuning frequency.</p><p></p><p>Despite the excursion videos you so commonly see online, ironically excursion is relatively unimportant for output when you tune your system high. For example 16Hz needs 4 times the excursion to reach the same SPL at 32Hz. I don’t think 16Hz is very popular for car audio, but in home audio, the demands for that kind of bass are uncanny.</p></blockquote><p></p>
[QUOTE="Remotia, post: 2208493, member: 568127"] Just want to make a correction here The box volume is directly related to the Q of the driver and of course the Vas, if you look at the Q of the LMS-5400 is remarkably low, in fact it will work in a smaller box than the TC-3000 if you wanted it too, the Sensitivity is also really high for a linear driver. 88dB for the 15" is respectable for an average driver and highly respectable for a linear driver that compensates BL product for quality. 88dB is right in line with the 15” RL-p, TC-3000, TC-2000, Mag 15” and Fi Q just to name some common examples off the top of my head. So it should perform at about the level of the TC-3000 (or anything else with a similar sensitivity) watt for watt, but able to handle much more power and have a higher xmax for deeper bass because of the huge voice coil. -And lets not forget the linear distortion advantages The LMS-4000 is the driver that requires a very large box and more power to achieve the same SPL. the sensitivity of the 15" 4000 is around 85dB, so it takes twice the power to reach the same SPL as the 5400. It also wants to see a much larger box. The 5400 is superior but more expensive and if considerable output is not your primary goal, the 4000 could be ideal, but is generally revered at as a hometheater driver because of the box volume requirements. As far as raw output for car audio, the TC-3000 +CP or 5200 +SP/+CP would be what I would recommend from our line. The +CP does not degrade the quality at all, it merely restricts ultimate mechanical excursion when the driver is pushed beyond its linear limits. The advantage is a much lighter moving mass and more output as a result because of higher sensitivity, but you still get a very long coil for 30mm of xmax. I recommend the +CP for car audio because of the lack of emphasis on deep bass (below 30Hz) There is really no reason for a tall rubber surround if you are going with a high tuning frequency. Despite the excursion videos you so commonly see online, ironically excursion is relatively unimportant for output when you tune your system high. For example 16Hz needs 4 times the excursion to reach the same SPL at 32Hz. I don’t think 16Hz is very popular for car audio, but in home audio, the demands for that kind of bass are uncanny. [/QUOTE]
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Two 12" BTL's or one 15" LMS-5400?
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