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 Multi-Way Conventional loudspeakers with crossovers

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 1st June 2006, 02:19 PM #1 jwatts   diyAudio Member   Join Date: Jan 2004 Location: Erwin, Tennessee Impedance Question Can I estimate the frequency response of a loudspeaker by using a plot of its impedance?
 1st June 2006, 04:07 PM #2 soongsc   diyAudio Member     Join Date: Mar 2005 Location: Taiwan No. __________________ Hear the real thing!
 1st June 2006, 04:36 PM #3 Cal Weldon   Speakerholic diyAudio Moderator     Join Date: Jan 2004 Location: Near Vancouver The high end will be tough to guage but if you have the impedance graph, you can tell the resonant frequency and have a good idea how low it can go as not too many drivers are much good below it. __________________ planet10 needs your help: Let's help Ruth and Dave
 1st June 2006, 06:11 PM #4 jwatts   diyAudio Member   Join Date: Jan 2004 Location: Erwin, Tennessee Measurements What is the best way to determine it? Can I calculate somehow from the woofers Thielle Small parameters?
 1st June 2006, 08:54 PM #5 Cal Weldon   Speakerholic diyAudio Moderator     Join Date: Jan 2004 Location: Near Vancouver Why don't you post what you know about the driver and we'll see what we can do. __________________ planet10 needs your help: Let's help Ruth and Dave
 2nd June 2006, 12:01 AM #6 jwatts   diyAudio Member   Join Date: Jan 2004 Location: Erwin, Tennessee 10 Inch Sub I was asked to find the Thielle Small parameters and properties of a subwoofer for a friend of mine. All I need is the frequency response. The parameters I have found so far are listed below. I can set up and do a near field frequency response measurement but if I could just calc it somehow it would make my life easier. Fs(Hz) = 33.79 Qms = 5.2537 Qes=.4616 Qts=.4883 Vas(ft^3)=.83 Bl(N/A)=7.82 Efficiency(%)=.09 Rvc(Ohms)=1.79 Le(uH)=652.19 Xmax(In) Peak to Peak = 1.17 Sensitivity 85 db@1w/1m SdIn^2) = 51.84 Vd(ft^3) = .035 Inverted Cone Volume(ft^3) = .047 Magnet and Cone Volume(ft^3) = .092 Mounting hole ID 9-1/4(In) Mounting depth 8 inches (In) Continuous power 500 watts RMS 80 oz double stacked magnets
 2nd June 2006, 01:05 AM #7 ocool_15   diyAudio Member   Join Date: Nov 2004 Location: sk your frequency response of a sub(any speaker) will be dependent on the enclosure. You can get an idea of its response <~300hz from the T/s parameters but measuring a speaker with a mic will be most accurate when done properly.
 2nd June 2006, 01:08 AM #8 jwatts   diyAudio Member   Join Date: Jan 2004 Location: Erwin, Tennessee Low End How about the low end? What is the lowest possible frequency this sub can produce? Can I get that from these parameters or impedance curve.
 2nd June 2006, 01:14 AM #9 ocool_15   diyAudio Member   Join Date: Nov 2004 Location: sk fs is an indication. get WinISD(free!) and check how it performs, you will have cabin gain to add to the low end. This looks like a car sub that is not optimized for sealed or ported specifically. F3 is when output power has dropped down to half and it used most often
 2nd June 2006, 01:25 AM #10 soongsc   diyAudio Member     Join Date: Mar 2005 Location: Taiwan There are three basic things that limit the low end Fo, driver area(size), and Xmax. The LinkWitz Lab site has a maximum SPL calculatorwhich is convenient. __________________ Hear the real thing!

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