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<blockquote data-quote="audio_phill" data-source="post: 6693659" data-attributes="member: 605512">Late to the punch, but heres fully broken in Specs, 1600 on burps if clean, rated for 400watts, I run mine @ 600 daily with properly set subsonic, will handle it for years (literally)Re&nbsp; &nbsp; &nbsp; &nbsp;&nbsp; =&nbsp; &nbsp; 3.4298 ohmsFs&nbsp; &nbsp; &nbsp; &nbsp;&nbsp; =&nbsp;&nbsp; 37.3410 HzZmax&nbsp; &nbsp; &nbsp;&nbsp; =&nbsp;&nbsp; 46.4751 ohmsQes&nbsp; &nbsp; &nbsp; &nbsp; =&nbsp; &nbsp; 0.3413Qms&nbsp; &nbsp; &nbsp; &nbsp; =&nbsp; &nbsp; 4.2834Qts&nbsp; &nbsp; &nbsp; &nbsp; =&nbsp; &nbsp; 0.3161Le&nbsp; &nbsp; &nbsp; &nbsp;&nbsp; =&nbsp; &nbsp; 2.2975 mH&nbsp; (at 1 kHz)Diam&nbsp; &nbsp; &nbsp;&nbsp; =&nbsp; 155.0000 mm&nbsp; (&nbsp; 6.1024 in&nbsp; )Sd&nbsp; &nbsp; &nbsp; &nbsp;&nbsp; =&nbsp; .019m^2 ( 29.2473 in^2)Vas&nbsp; &nbsp; &nbsp; &nbsp; =&nbsp;&nbsp; 10.5085 L&nbsp;&nbsp; (&nbsp; 0.3711 ft^3)BL&nbsp; &nbsp; &nbsp; &nbsp;&nbsp; =&nbsp;&nbsp; 14.3582 TMMms&nbsp; &nbsp; &nbsp; &nbsp; =&nbsp;&nbsp; 87.4380 gCms&nbsp; &nbsp; &nbsp; &nbsp; =&nbsp; 207.7628 uM/NKms&nbsp; &nbsp; &nbsp; &nbsp; = 4813.1816 N/MRms&nbsp; &nbsp; &nbsp; &nbsp; =&nbsp; &nbsp; 4.7893 R mechanicalEfficiency =&nbsp; &nbsp; 0.1506 %Sensitivity=&nbsp;&nbsp; 83.7971 dB @1W/1mI did 141 at the kick on termlab @ 44Hz with a single TB Ultra 8 in 1 cube @ 40Hz, 135 @ headrest (1600 watt burp) 131 on 600, in .8 - 1cube per @ 32Hz, 30Hz is no prob. Fs isn&#039;t that important most of the time, of course lower fs means flatter lower, but if the Q isn&#039;t above .3 you&#039;ll be reliant on the enclosure anywho, pay more attention to Qts, a fs of 50Hz will still play to 25Hz if the Qts is .45 or higher, to high and the sub gets boomy and very un-flat though, I prefer between .4 and .5, but for an 8, a TB Ultra will more than impress with it&#039;s output and transience, and the P-P of 1.5&quot; in usable and 1.75&quot; mechanical is fun as well. Very responsive (bass notes instead of just muddy tones) Quite efficient for an 8, 84dB 1w/1m is louder watt for watt than a RD V3 Alpha 10. Alot flatter and no coloration, each is hand assembled and tested before they leave Mr&#039;s Carroll&#039;s possession. the TB Ultra 10&#039;s are quite impressive too, 30Hz Fs, 1w/1m of 88.02dB, Qts .3, Vas 1.3cu ft, in 1.4per @ 32 they get quite energetic on 800 rms per. 1.5 @ 35 per and kick drums become a solid thud in the chest, 130gram mms with a bl of 25.5 assures very fast and accurate sound reproduction. 2&quot; coil on the Ultra 8&quot; and 3&quot; coil on the Ultra 10&quot; I make no money on these, James is a friend and I sell them to help him out. If anybody wants and True Bass hit me up, I keep none on the shelves and each he builds for me is a fresh one, not one laying around, hence the reason I can get the dust-caps and logos any way ya want them. White or black cones are standard color, any other color is $5 extra per, logo colors are no extra charge.</blockquote>

[QUOTE="audio_phill, post: 6693659, member: 605512"] Late to the punch, but heres fully broken in Specs, 1600 on burps if clean, rated for 400watts, I run mine @ 600 daily with properly set subsonic, will handle it for years (literally) Re = 3.4298 ohms Fs = 37.3410 Hz Zmax = 46.4751 ohms Qes = 0.3413 Qms = 4.2834 Qts = 0.3161 Le = 2.2975 mH (at 1 kHz) Diam = 155.0000 mm ( 6.1024 in ) Sd = .019m^2 ( 29.2473 in^2) Vas = 10.5085 L ( 0.3711 ft^3) BL = 14.3582 TM Mms = 87.4380 g Cms = 207.7628 uM/N Kms = 4813.1816 N/M Rms = 4.7893 R mechanical Efficiency = 0.1506 % Sensitivity= 83.7971 dB @1W/1m I did 141 at the kick on termlab @ 44Hz with a single TB Ultra 8 in 1 cube @ 40Hz, 135 @ headrest (1600 watt burp) 131 on 600, in .8 - 1cube per @ 32Hz, 30Hz is no prob. Fs isn't that important most of the time, of course lower fs means flatter lower, but if the Q isn't above .3 you'll be reliant on the enclosure anywho, pay more attention to Qts, a fs of 50Hz will still play to 25Hz if the Qts is .45 or higher, to high and the sub gets boomy and very un-flat though, I prefer between .4 and .5, but for an 8, a TB Ultra will more than impress with it's output and transience, and the P-P of 1.5" in usable and 1.75" mechanical is fun as well. Very responsive (bass notes instead of just muddy tones) Quite efficient for an 8, 84dB 1w/1m is louder watt for watt than a RD V3 Alpha 10. Alot flatter and no coloration, each is hand assembled and tested before they leave Mr's Carroll's possession. the TB Ultra 10's are quite impressive too, 30Hz Fs, 1w/1m of 88.02dB, Qts .3, Vas 1.3cu ft, in 1.4per @ 32 they get quite energetic on 800 rms per. 1.5 @ 35 per and kick drums become a solid thud in the chest, 130gram mms with a bl of 25.5 assures very fast and accurate sound reproduction. 2" coil on the Ultra 8" and 3" coil on the Ultra 10" I make no money on these, James is a friend and I sell them to help him out. If anybody wants and True Bass hit me up, I keep none on the shelves and each he builds for me is a fresh one, not one laying around, hence the reason I can get the dust-caps and logos any way ya want them. White or black cones are standard color, any other color is $5 extra per, logo colors are no extra charge. [/QUOTE]

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