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<blockquote data-quote="audio_phill" data-source="post: 7289904" data-attributes="member: 605512">lol, the lms ultra is a low q woofer, only fools with insane power on tap and headroom to match and an audiophile eq should even attempt it. The havoc took it simply because the lms was being ran improperly.Idea enclosure for the lms 5400 is 4.3net @ 25Hz, in sealed, optimum would be 3.4 for an f3 of just over 36hz. Sealing it will give you 4.7dB of loss over the vented enclosure @ 30Hz, and 3.4dB loss at 25Hz, 3dB loss @35Hz...Heres tsp&#039;s for original vs new (china version)Old VersionRe&nbsp; &nbsp; &nbsp; &nbsp;&nbsp; =&nbsp; &nbsp; 4.0107 ohmsFs&nbsp; &nbsp; &nbsp; &nbsp;&nbsp; =&nbsp;&nbsp; 22.4333 HzZmax&nbsp; &nbsp; &nbsp;&nbsp; =&nbsp;&nbsp; 52.5281 ohmsQes&nbsp; &nbsp; &nbsp; &nbsp; =&nbsp; &nbsp; 0.4130Qms&nbsp; &nbsp; &nbsp; &nbsp; =&nbsp; &nbsp; 4.9959Qts&nbsp; &nbsp; &nbsp; &nbsp; =&nbsp; &nbsp; 0.3815Le&nbsp; &nbsp; &nbsp; &nbsp;&nbsp; =&nbsp; &nbsp; 1.9970 mH&nbsp; (at 1 kHz)Diam&nbsp; &nbsp; &nbsp;&nbsp; =&nbsp; 390.8425 mm&nbsp; ( 15.3875 in&nbsp; )Sd&nbsp; &nbsp; &nbsp; &nbsp;&nbsp; =119975.7382 mm^2(185.9628 in^2)Vas&nbsp; &nbsp; &nbsp; &nbsp; =&nbsp; 188.3549 L&nbsp;&nbsp; (&nbsp; 6.6517 ft^3)BL&nbsp; &nbsp; &nbsp; &nbsp;&nbsp; =&nbsp;&nbsp; 27.3490 N/AMms&nbsp; &nbsp; &nbsp; &nbsp; =&nbsp; 546.4212 gCms&nbsp; &nbsp; &nbsp; &nbsp; =&nbsp;&nbsp; 92.1140 uM/NKms&nbsp; &nbsp; &nbsp; &nbsp; =10856.1182 N/MRms&nbsp; &nbsp; &nbsp; &nbsp; =&nbsp;&nbsp; 15.4164 R mechanicalEfficiency =&nbsp; &nbsp; 0.4838 %Sensitivity=&nbsp;&nbsp; 88.8647 dB @1W/1mNew VersionRe&nbsp; &nbsp; &nbsp; &nbsp;&nbsp; =&nbsp; &nbsp; 4.1115 ohmsFs&nbsp; &nbsp; &nbsp; &nbsp;&nbsp; =&nbsp;&nbsp; 21.8718 HzZmax&nbsp; &nbsp; &nbsp;&nbsp; =&nbsp;&nbsp; 82.0565 ohmsQes&nbsp; &nbsp; &nbsp; &nbsp; =&nbsp; &nbsp; 0.3752Qms&nbsp; &nbsp; &nbsp; &nbsp; =&nbsp; &nbsp; 7.1129Qts&nbsp; &nbsp; &nbsp; &nbsp; =&nbsp; &nbsp; 0.3564Le&nbsp; &nbsp; &nbsp; &nbsp;&nbsp; =&nbsp; &nbsp; 2.4618 mH&nbsp; (at 1 kHz)Diam&nbsp; &nbsp; &nbsp;&nbsp; =&nbsp; 390.8425 mm&nbsp; ( 15.3875 in&nbsp; )Sd&nbsp; &nbsp; &nbsp; &nbsp;&nbsp; =119975.7382 mm^2(185.9628 in^2)Vas&nbsp; &nbsp; &nbsp; &nbsp; =&nbsp; 192.8393 L&nbsp;&nbsp; (&nbsp; 6.8101 ft^3)BL&nbsp; &nbsp; &nbsp; &nbsp;&nbsp; =&nbsp;&nbsp; 29.0781 N/AMms&nbsp; &nbsp; &nbsp; &nbsp; =&nbsp; 561.4697 gCms&nbsp; &nbsp; &nbsp; &nbsp; =&nbsp;&nbsp; 94.3070 uM/NKms&nbsp; &nbsp; &nbsp; &nbsp; =10603.6641 N/MRms&nbsp; &nbsp; &nbsp; &nbsp; =&nbsp;&nbsp; 10.8478 R mechanicalEfficiency =&nbsp; &nbsp; 0.5053 %Sensitivity=&nbsp;&nbsp; 89.0534 dB @1W/1mVery efficient but lower Q than needed to be an authority subsonic, and not have a more than 1dB output deviation across its usable bandwidth. The LMS 4K 10 has a flatter bandwidth and can play much lower than the LMS 5400, just not with ridiculous output.</blockquote>

[QUOTE="audio_phill, post: 7289904, member: 605512"] lol, the lms ultra is a low q woofer, only fools with insane power on tap and headroom to match and an audiophile eq should even attempt it. The havoc took it simply because the lms was being ran improperly. Idea enclosure for the lms 5400 is 4.3net @ 25Hz, in sealed, optimum would be 3.4 for an f3 of just over 36hz. Sealing it will give you 4.7dB of loss over the vented enclosure @ 30Hz, and 3.4dB loss at 25Hz, 3dB loss @35Hz... Heres tsp's for original vs new (china version) Old Version Re = 4.0107 ohms Fs = 22.4333 Hz Zmax = 52.5281 ohms Qes = 0.4130 Qms = 4.9959 Qts = 0.3815 Le = 1.9970 mH (at 1 kHz) Diam = 390.8425 mm ( 15.3875 in ) Sd =119975.7382 mm^2(185.9628 in^2) Vas = 188.3549 L ( 6.6517 ft^3) BL = 27.3490 N/A Mms = 546.4212 g Cms = 92.1140 uM/N Kms =10856.1182 N/M Rms = 15.4164 R mechanical Efficiency = 0.4838 % Sensitivity= 88.8647 dB @1W/1m New Version Re = 4.1115 ohms Fs = 21.8718 Hz Zmax = 82.0565 ohms Qes = 0.3752 Qms = 7.1129 Qts = 0.3564 Le = 2.4618 mH (at 1 kHz) Diam = 390.8425 mm ( 15.3875 in ) Sd =119975.7382 mm^2(185.9628 in^2) Vas = 192.8393 L ( 6.8101 ft^3) BL = 29.0781 N/A Mms = 561.4697 g Cms = 94.3070 uM/N Kms =10603.6641 N/M Rms = 10.8478 R mechanical Efficiency = 0.5053 % Sensitivity= 89.0534 dB @1W/1m Very efficient but lower Q than needed to be an authority subsonic, and not have a more than 1dB output deviation across its usable bandwidth. The LMS 4K 10 has a flatter bandwidth and can play much lower than the LMS 5400, just not with ridiculous output. [/QUOTE]

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