Working out X/O values using this online calculator
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 Multi-Way Conventional loudspeakers with crossovers

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 1st May 2011, 03:12 AM #1 Bill poster   diyAudio Member     Join Date: Jun 2008 Location: Bangkok/London Working out X/O values using this online calculator Just found this useful calculator ERSE - Crossover Calculator - First Order 2 Way when I input the impedance, should it be the overall rating of the driver (ie 8 ohm) or the impedance level of the driver at the point of x/over ( in this case, 7 ohm @ 350 hz) ?
 1st May 2011, 03:31 AM #2 tinitus   diyAudio Moderator R.I.P.   Join Date: Nov 2005 neither there is no fixed impedance mostly you will need to calculate with a lower xo point, resulting in bigger inductor look at impedance above xo point imagine what happens when the inductor 'meets' the rising impedance a zobel takes care of some of those problems, but not all of it low impedance, small inductor, big cap high impedance, big inductor, small cap
 1st May 2011, 01:00 PM #3 Bill poster   diyAudio Member     Join Date: Jun 2008 Location: Bangkok/London Kind of understand crossovers are something I never got to grips with, hence going for as simple design as poss. Prob a good idea to get cheap caps first etc before splashing out on sonicap platinums etc
 1st May 2011, 11:17 PM #4 PeteMcK diyAudio Member   Join Date: Feb 2002 Location: Western Sydney the impedance level of the driver at the point of x/over - always __________________ Impedance varies with frequency, use impedance plots of your drivers and make crossover calculations using the actual impedance of the driver at the crossover frequency
AllenB
diyAudio Member

Join Date: Oct 2008
Quote:
 Originally Posted by Bill poster Prob a good idea to get cheap caps first etc
Some of us change our crossovers regularly over periods of months. Using the correct crossover components and values is far and away more important than how much you spend on a capacitor, provided you at least make sensible choices on the types of component you use.

The basic issue with crossovers is twofold. Firstly, although you want to shape the tweeter and woofer response so they match up, they are anything but even and flat to start with...so the needs of your crossover will vary depending on what frequency you are looking at.

Secondly, the drivers' impedance is anything but flat either, so the crossovers will behave differently depending on the frequency, and this may give unexpected results.

This usually also means that what the tweeter needs will not be the opposite of what the woofer needs. When designing a crossover using modern techniques, the rules may go out the window.

If you want, I will outline a simple but effective starting method for building a two way crossover using 8 components, which is useful for when you want to adjust it by listening methods.

 2nd May 2011, 10:37 PM #6 PeteMcK diyAudio Member   Join Date: Feb 2002 Location: Western Sydney Allen, re:' I will outline a simple but effective starting method for building a two way crossover using 8 components' - please do... this is one of the most asked & misunderstood questions on this site. It would be a good idea to put it in Articles or the Wiki too.... __________________ Impedance varies with frequency, use impedance plots of your drivers and make crossover calculations using the actual impedance of the driver at the crossover frequency
 2nd May 2011, 11:08 PM #7 Cal Weldon   Speakerholic diyAudio Moderator     Join Date: Jan 2004 Location: Near Vancouver AllenB, Bring it to my attention, I will take the idea of making it a sticky to the back room. Please PM me when you have posted. __________________ planet10 needs your help: Let's help Ruth and Dave
 2nd May 2011, 11:17 PM #8 pinkmouse   diyAudio Moderator     Join Date: Apr 2002 Location: Rotherham, England And I'll remind him. __________________ Rick: Oh Cliff / Sometimes it must be difficult not to feel as if / You really are a cliff / when fascists keep trying to push you over it! / Are they the lemmings / Or are you, Cliff? / Or are you Cliff?
 2nd May 2011, 11:30 PM #9 AllenB   diyAudio Member   Join Date: Oct 2008 Thanks guys, I'll start writing tonight.

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