Guest " " Posted June 3, 2006 Share Posted June 3, 2006 here is a good xover calculator for 1st, 2nd, 3rd, 4th, 6th order xover networks. does not cover zobel and notch filters. http://www.lalena.com/audio/calculator/xover/ Quote Link to comment Share on other sites More sharing options...
DrWho Posted June 3, 2006 Share Posted June 3, 2006 Awesome...I finally don't have to do all the calculations by hand anymore [] Quote Link to comment Share on other sites More sharing options...
DizRotus Posted June 3, 2006 Share Posted June 3, 2006 Thanks for the link to the site. Notch filters are addressed elsewhere on the site. Quote Link to comment Share on other sites More sharing options...
Lostinozz Posted June 3, 2006 Share Posted June 3, 2006 Awesome...I finally don't have to do all the calculations by hand anymore [] I just guess, or go with the cap color that matches the room they'll be in.[] Quote Link to comment Share on other sites More sharing options...
DrWho Posted June 4, 2006 Share Posted June 4, 2006 Awesome...I finally don't have to do all the calculations by hand anymore [] I just guess, or go with the cap color that matches the room they'll be in.[] lol! my profs will get a kick out of that one...too funny Quote Link to comment Share on other sites More sharing options...
Rockets Posted June 18, 2006 Share Posted June 18, 2006 This spreadsheet is also worth a look http://www.pvconsultants.com/audio/targetgen/pcdc.htm Quote Link to comment Share on other sites More sharing options...
Deang Posted June 18, 2006 Share Posted June 18, 2006 None of those work right for three-ways. Quote Link to comment Share on other sites More sharing options...
Rockets Posted June 18, 2006 Share Posted June 18, 2006 Does not work as in.... the spread sheet did not function for you? The values are incorrect? Granted you can't integrate an autoformer into the equation, but other than that I 've missed the drawback. I ran this 3 way on there, and it's calc's look correct to me, but hey I could be wrong. Third Order Butterworth Spread (FH/FL) 10 (8 or 10) ® Woofer : 4 Ohm ® Midrange : 16 Ohm ® Tweeter : 8 Ohm F low : 400 Hz F high : 4000 Hz F high : 1264.91 Hz Tweeter- High Pass Section C1 = 3.56 uF L1 = 0.24 mH C2 = 9.30 uF Woofer - Low Pass Section L2 = 2.23 mH C3 = 132.94 uF L3 = 0.85 mH Midrange - Band Pass Section C4 = 17.17 uF L4 = 4.79 mH C5 = 52.77 uF L5 = 0.76 mH C6 = 3.78 uF L6 = 0.32 mH Bandpass gain = 0.85 dB Midrange Polarity= Normal Quote Link to comment Share on other sites More sharing options...
Deang Posted June 18, 2006 Share Posted June 18, 2006 They don't work right in that that they don't spit out the right values for the crossover points you want. None of those calculators factor in the reactive component. In a three-way filter, the crossover points shift without the addtional calculation. The only online calculator for three ways that has any value can be found here: www.kbapps.com Anyone doing anything higher than first order should invest in some decent software. Quote Link to comment Share on other sites More sharing options...
Guest " " Posted June 18, 2006 Share Posted June 18, 2006 They don't work right in that that they don't spit out the right values for the crossover points you want. None of those calculators factor in the reactive component. In a three-way filter, the crossover points shift without the addtional calculation. The only online calculator for three ways that has any value can be found here: www.kbapps.com Anyone doing anything higher than first order should invest in some decent software. I gave this some thought after reflecting back on some past projects. Cross over design is a science only if you have a complete life cycle development process for it. Driver analysis, cabinet considerations, crossover calculation, assembly, performance measurements, adjustments based on measurements, production version. You will need Design software, measurement tools, appropriate environment to test, etc.<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /> Ironically, you still wind up making some trade offs, since the available parts, do not exactly match the often required values. Capacitor values needed rarely match what is available from capacitor vendors. Inductors have the same issue, but they often come with charts that estimate the amount of turns to take off to get to a lower value. During one project I sought absolute values and wound up with a crossover board that was 18" by 18" in size due to the needed space of all the combinations of parts needed. For most, crossover construction is an art, and the available crossover calculators work just fine. Most cross overs use parts that have been approximated to the nearest available value. Some considerations for the artist, do you round up, or do you round down. Some artist round up for capacitors and round down for inductors. There are pros and con's for rounding up or rounding down. As another point on the emphasis of the artist side of this process, the klipsch LaScala just happen to be able to be constructed with one and a half sheets of plywood each...3 sheets for the pair. There is less than 8 square feet of scrap from the avaialbe 96 sq feet. Running the woofer requirements through design software and calculators using the woofers expected performance range would result in a considerablly larger cabinet, and would use considerablly more wood than just the 96 SQ feet on three sheets of plywood per pair. While some bandwith improvements may result in a larger cabinet, the construction, warehousing, and transporting cost of going down 20 more hertz was probally not cost effective. My view is that the goal was to produce a pair of cabinets using less than 96 sq feet of plywood reguardless of the design software or calculator. Quote Link to comment Share on other sites More sharing options...
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