Posted June 21, 200718 yr So after randomly selecting units and testing them (after a good burn-in period) here are the published specs for the new IXL-18.4. You may find them better than the original(s). Even I am pleasantly surprised:IXL-18.4Thiele-Small parameters:Fs = 17.7 HzRe = 3.4 ohms[dc]Le = 6.09 mHQt = 0.37Qes = 0.39Qms = 5.59Mms = 434.34 gramsRms = 8.69 kg/sCms = 0.184 mm/NVas = 274.1 litersSd= 1029.22 cm^2Bl = 20.51 TmLp(2.83V/1m) = 91.60 dBIf I have enough time this weekend, I'll do some testing and post some graphs.Best,MarkEDIT: Le has been changed to a more accurate number. This measurement was taken using a 100Hz test frequency.
June 21, 200718 yr Can I get outside diameter and mounting depth measurements? Thanks Mark! Edited June 21, 200718 yr by cobbpa
June 21, 200718 yr Pleasant surprise is an understatement. Those who were very concerned about enclosure size before should be a little bit more comfortable: huge drop in Vas and Qtc .707 is about half now what it was before (down to around 3.75 cubes from around 7 cubes before).Seems very promising Mark.
June 21, 200718 yr So after randomly selecting units and testing them (after a good burn-in period) here are the published specs for the new IXL-18.4. You may find them better than the original(s). Even I am pleasantly surprised:IXL-18.4Thiele-Small parameters:Fs = 17.7 HzRe = 3.4 ohms[dc]Le = 10747.13 uHL2 = 6564.99 uHPerhaps a stupid question, but I have the agility to convert units of a law student. Is the inductance of this driver 10.7mH or 1.07mH?
June 21, 200718 yr So after randomly selecting units and testing them (after a good burn-in period) here are the published specs for the new IXL-18.4. You may find them better than the original(s). Even I am pleasantly surprised:IXL-18.4Thiele-Small parameters:Fs = 17.7 HzRe = 3.4 ohms[dc]Le = 10747.13 uHL2 = 6564.99 uHPerhaps a stupid question, but I have the agility to convert units of a law student. Is the inductance of this driver 10.7mH or 1.07mH?1 uH (micro Henry) = 0.001 mH (milli Henry1 mH = 1000 uH10747.13 uH = 10.75 mHInductive corner frequency is determined byf = Re/(2Pi*Le)f = 3.4/(2*3.14*0.01075)f = 3.4/0.06751f = 50.36 Hz
June 21, 200718 yr Now that i know i have enough volume to do one in a ported box with optimal conditions... I wonder what one would sound like in a 4th order . Time to compare the IXL's to the mj's mark Edited June 21, 200718 yr by cycle252
June 22, 200718 yr Wow mark what changes were made to decrease the Vas so much? Either way Nice Job! Now if only it were a dual.
June 22, 200718 yr Author Published Le numbers seem to be a bit out-of-bounds for the design. I will be verifiying this tomorrow using a rather expensive LCR device to get a better reading. I'll post the results here.The X readings are the same as the prototype.Best,Mark
June 22, 200718 yr hmmm...you are making me want to yank the back seat outa the truck again..lol...adn do a pair of these things, lol...wheeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee
June 22, 200718 yr 1 uH (micro Henry) = 0.001 mH (milli Henry1 mH = 1000 uH10747.13 uH = 10.75 mHInductive corner frequency is determined byf = Re/(2Pi*Le)f = 3.4/(2*3.14*0.01075)f = 3.4/0.06751f = 50.36 HzI thought that the quoted Edited June 22, 200718 yr by DS-21
June 24, 200718 yr Author Here is the output of the IXL in a 260 litre bass reflex enclosure tuned to 17Hz. The green line is the driver, the yellow is the port. Measurements are nearfield - mic was placed one inch from driver and port. The port measurement has a 24db/oct xover applied at 100Hz for clarity.
June 25, 200718 yr Here is the output of the IXL in a 260 litre bass reflex enclosure tuned to 17Hz. The green line is the driver, the yellow is the port. Measurements are nearfield - mic was placed one inch from driver and port. The port measurement has a 24db/oct xover applied at 100Hz for clarity.Mark, did the video turn out?I was at Mark's when the testing was done. This driver can move a lot of air! How come you guys can't listen to music at 85-90dB?
June 25, 200718 yr Here is the output of the IXL in a 260 litre bass reflex enclosure tuned to 17Hz. The green line is the driver, the yellow is the port. Measurements are nearfield - mic was placed one inch from driver and port. The port measurement has a 24db/oct xover applied at 100Hz for clarity.Mark, did the video turn out?I was at Mark's when the testing was done. This driver can move a lot of air! How come you guys can't listen to music at 85-90dB? ppppsshhhh........I fart 85db....LOL I wanna see this vid Edited June 25, 200718 yr by Puggsley456
June 26, 200718 yr Hmm... I figured you would be louder than that Puggs. Here's a vid:IXLHAHA......sounds like you had the wife outside cutting the grass while you played with your new toy. Was that in a tube? Get some music on it!
June 26, 200718 yr Admin Good movement from that beast. For some reason I had the song "Cat Scratch Fever" pop into my head when I watched that.
June 26, 200718 yr Author HAHA......sounds like you had the wife outside cutting the grass while you played with your new toy. Was that in a tube? Get some music on it! Don't you know it! It was 32*C outside and she was sweating bullets, while Gio and I were inside the air conditioned house sucking on beers and watching the walls move...Now that's a dedicated wife!
June 26, 200718 yr Admin HAHA......sounds like you had the wife outside cutting the grass while you played with your new toy. Was that in a tube? Get some music on it! Don't you know it! It was 32*C outside and she was sweating bullets, while Gio and I were inside the air conditioned house sucking on beers and watching the walls move...Now that's a dedicated wife!
June 27, 200718 yr Author Just for you, I'll attach an extra pair of connectors on the basket and you can connect wires to them. Then you can pretend its a dual coil sub...
June 28, 200718 yr Just for you, I'll attach an extra pair of connectors on the basket and you can connect wires to them. Then you can pretend its a dual coil sub... I'm good at pretending.
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