DizRotus Posted November 10, 2012 Share Posted November 10, 2012 I have a pair of KEF B139 woofers, each in a wool damped transmission line enclosure. They've provided the bass to augment a pair of BBC LS3/5As for more than 3 decades. I'm curious about the possibility of using the B139s in a single push pull slot loaded (PPSL) sub-woofer to combine with horns above approximately 300hz. Any thoughts, pro or con, are welcomed. Quote Link to comment Share on other sites More sharing options...
djk Posted November 11, 2012 Share Posted November 11, 2012 Do you have four of the KEF? It will probably work, and you can use any loading scheme that you like. I use 6th order vented almost exclusively, but vented, sealed, tapped-horn, dipole designs have all been done. Maybe it's time for a transmission line variant? I tried a pair of BBC LS3/5As above dual 15s bi-amped at 400hz, it sounded great but I slagged the tweeters trying to play loud. Quote Link to comment Share on other sites More sharing options...
DizRotus Posted November 11, 2012 Author Share Posted November 11, 2012 No only two. I see a problem already. Four new drivers from Parts Express makes more sense for 2 channel. Quote Link to comment Share on other sites More sharing options...
djk Posted November 11, 2012 Share Posted November 11, 2012 These look like they would fit in a cube form about the same size as the LaScala bottom, be -3dB at 27hz, and 100.5dB mid-band..A set of four wouldbe about $90 each. http://www.parts-express.com/pe/showdetl.cfm?partnumber=295-120 File: 295-120 II.bb6 ----------------------------------------- Driver Properties Name: 295-120 Type: Standard one-way driver Company: Dayton Loudspeaker Co. Comment: Nov 2011 (New) No. of Drivers = 2 Mounting = Standard Wiring = Parallel Fs = 29.6 Hz Qms = 10.55 Vas = 128.1 liters Cms = 0.351 mm/N Mms = 82.29 g Rms = 1.451 kg/s Xmax = 8 mm Xmech = 12 mm P-Dia = 254 mm Sd = 506.7 sq.cm P-Vd = 0.405 liters Qes = 0.36 Re = 6 ohms Le = 3.07 mH Z = 8 ohms BL = 15.97 Tm Pe = 275 watts Qts = 0.348 no = 0.89 % 1-W SPL = 91.64 dB 2.83-V SPL = 92.89 dB ----------------------------------------- Box Properties Name: Type: Vented Box w/ Active HP Filter Shape: Prism, square Vb = 4.5 cu.ft Fb = 27 Hz QL = 6.279F3 = 27.09 Hz Fill = minimal No. of Vents = 2 Vent shape = rectangle Vent ends = two flush Hv = 10 in Wv = 2 in Lv = 29.51 in ----------------------------------------- Active 12 dB/oct. HP Filter Fx = 27 Hz Qx = 2 Quote Link to comment Share on other sites More sharing options...
sunnysal Posted November 15, 2012 Share Posted November 15, 2012 aha you gots dennis´ attention! how about something much cheaper? like these: maybe this one? W69-1042J, a little smaller and doesnt go quite as low (35hz free air) but... http://www.tb-speaker.com/detail/1208_03/w69-1042j.htm Quote Link to comment Share on other sites More sharing options...
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