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 15th June 2006, 10:30 PM #11 Yousuredo   diyAudio Member   Join Date: Jun 2006 downloaded it, but caint get it to work... and it doenst have DAYTON speakers in it at all....whats up with that ? Acording to my volume stated by factory, what diminsions does the bow need to be
 16th June 2006, 02:04 AM #12 roger_lew   diyAudio Member     Join Date: Nov 2005 Location: Moscow, ID Are you planning on building the 2 cubic foot vented box specified in your first post? For the MA driver? Are you thinking Dayton now (winisd lists them under DLS by the way)? Well if you are building the vented box for the MA you just need to make sure the internal volume of your box is 2 cubic feet + the volume of your two ports (3"d x 15.5") + the volume of your plate amp(s) + the volume displaced by the speaker + the volume of your internal bracing. This is how I would do it quickly. 1. Calculate port volume Assuming you use .25" pvc pipe each of your ports are roughly 150 cubic inches each (pi*1.75*15.5, 1.75 opposed to 1.5 to account for .25 inch wall thickness). 2. Calculate the volume displaced by your plate amp. Lets just assume 35 in^3. 3. Calculate (guesstimate) volume displaced by speaker Let's assume 50 in^3 4. Calculate (guesstimate) volume displaced by bracing Let's assume 300 in^3 (20" x 20" x .75") 4. Add up these volumes Then you add up these measurements 2*12^3 (2 cubic feet) + 150*2 (for both ports) + 35 (plate amp) + 50 (speaker) + 300 (bracing) ... and you get 4141 in^3 (2.4 ft^3) 5. Find box dimensions with appropriate internal volume You might have a depth, width, or height consideration that you need to abide by, but I am going to calculate a cube b/c it is easy and efficient by taking the cubed root of 4141 which is roughly 16 inches. The exact dimensions don't really matter (assuming they are not wildy disproportional) as long as the internal volume remains close to what you need. Note: If you have 1" walls your port ends up being 1.5" from the rear wall, which might be to close for some but this is purely hypothetical. Does that help at all?
 16th June 2006, 02:18 AM #13 Yousuredo   diyAudio Member   Join Date: Jun 2006 well sort of.... thats alot of math there... pretty sure rectacgle...for port issues... and the speaker has a double stack magnet(Hugh) even larger that than the titianic's you stated a 16" cube... so to go rectangle i need 18" Tall/Long...and 12"/14" for the rest correct ?
 16th June 2006, 05:43 AM #14 roger_lew   diyAudio Member     Join Date: Nov 2005 Location: Moscow, ID 18*12*14=3024 cubic inches, which is smaller than what you need. In my example you needed ~4041 in^3. You could have internal dimensions of 18" x 15" x 15". And don't forget that these are internal dimensions so if you use 3/4" MDF your box will have external dimensions of 19.5" x 16.5" x 16.5".
 18th June 2006, 03:41 AM #15 Yousuredo   diyAudio Member   Join Date: Jun 2006 the box is built... and drying... tommorow is Sub Day...Yeah ! Built it out of 3/4" MDF, seperated the amp from the main box, and placed an extra 1/2" on the front and back, for a total of 1 1/4 thick... braced the ports in the rear as well... 24" Long Total (last 4.5" is for the amp) 16.5" x 16.5" for the rest, with two 3" x 15.5" Ports... Caint wait to hear it... Keep ya posted...
 20th June 2006, 12:50 AM #16 Norcad   diyAudio Member   Join Date: Jun 2006 Sorry Of course it's 12 ohm in serie. BUT The Small/Thiele parameters DO CHANGE, if you use the voice coils separate. The parameters you got, was with the DVC in series og paralell. Qes = 0,47 & Qts = 0,41 With the DVC separate this will be: Qes = 0,94 & Qts = 0,74 Just try, and you will hear that with seriell or paralell you can achieve an flat response, but try separates, an you would get an about 6 dB boost around 50 Hz, who will make the sub sound "boomy" An another issue is to adjust the gain of to amps to give the same amount of power, that aint easy. Norcad __________________ Norcad
 20th June 2006, 04:51 PM #17 richie00boy   Did it Himself diyAudio Member     Join Date: Nov 2003 Location: Gloucestershire, England, UK The parameters are the same as long as both coils are driven, be that series, parallel or separate. They only change when one coil is left open or shorted. __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, modules and more.
 21st June 2006, 10:39 PM #18 Svante   diyAudio Member     Join Date: Feb 2004 Location: Stockholm Psst... Look in my signature... __________________ Simulate loudspeakers: Basta! Simulate the baffle step: The Edge

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