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MultiWay Conventional loudspeakers with crossovers 

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1st May 2011, 03:12 AM  #1 
diyAudio Member
Join Date: Jun 2008
Location: London/Bangkok

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 
diyAudio Moderator R.I.P.

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 
diyAudio Member
Join Date: Jun 2008
Location: London/Bangkok

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 
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 
2nd May 2011, 11:20 AM  #5 
diyAudio Member
Join Date: Oct 2008

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 
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 
Speakerholic
diyAudio Moderator

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. 
2nd May 2011, 11:17 PM  #8 
diyAudio Moderator

And I'll remind him.
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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 
diyAudio Member
Join Date: Oct 2008

Thanks guys, I'll start writing tonight.

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