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Multi-Way Conventional loudspeakers with crossovers

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Old 12th June 2012, 06:18 AM   #21
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Try this crossover(my design) for your speakers if you like it.
Impedance equalization can be calculated here.
Impedance Equalization (L-Pad) Circuit Designer / Calculator
Resistor value for tweeter is from 2 Ohm to 7.5 Ohm
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Old 12th June 2012, 06:51 AM   #22
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This is the crossover schematic
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Old 12th June 2012, 10:05 AM   #23
ODougbo is offline ODougbo  United States
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That is interesting, thanks, will build while waiting for parts that I ordered yesterday.

I've wanted to do this for a very long time, will build them all!

Added 8' 4 wire cables to each last night; going to lay the parts on large board(s) for testing.
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Old 12th June 2012, 12:45 PM   #24
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All resistors should be 10W or 12W. Capacitor value for tweeter is 3.3uF or maximum 4uF.
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Old 12th June 2012, 01:59 PM   #25
ODougbo is offline ODougbo  United States
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Where should I start with the TBD resistors?

Have several pairs 6, 8, 10, no small ones.
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Old 12th June 2012, 06:14 PM   #26
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Try to use 6 Ohm resistor first. You can change the resistor value by adding 1 Ohm resistor in series with 6 Ohm resistor each time and test it until you hear the balance between tweeter and woofer ( you need several 1 Ohm resistors). I guess that the resistor value may be one of these values 5.6, 6, 6.8, and 7.5.
Good luck and have fun!

Last edited by tuantran; 12th June 2012 at 06:18 PM.
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Old 12th June 2012, 09:15 PM   #27
ODougbo is offline ODougbo  United States
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I made up a 1.2mh coil, could make up the .5 air core, but just ordered a pair (the iron core is .5)

Guessed at the woofer cap and resistor, both are 7.

*the 1.2coil in pic was a 1mh, just added one more layer.
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Old 12th June 2012, 10:03 PM   #28
sreten is offline sreten  United Kingdom
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Quote:
Originally Posted by tuantran View Post
Try this crossover(my design) for your speakers if you like it.
Impedance equalization can be calculated here.
Impedance Equalization (L-Pad) Circuit Designer / Calculator
Resistor value for tweeter is from 2 Ohm to 7.5 Ohm
Hi,

That site is how to design x/o's if your an electrician and know sod all about acoustics.
It will work but not that well, too simple. There is far more to proper simple hifi x/o design.

rgds, sreten.
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When your only tool is a hammer, every problem looks like a nail - Abraham Maslow

Last edited by sreten; 12th June 2012 at 10:06 PM.
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Old 13th June 2012, 10:16 AM   #29
ODougbo is offline ODougbo  United States
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Thanks for reposting the link, I didn't see that before. So e.g. I typed in 4ohm (woofer) and 1.2mh coil and said to use: C=48uf & Rc=5 Ohm.

sreten, out of the 3 posted designs, where would you start - #6?
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Old 13th June 2012, 12:34 PM   #30
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Re is driver (woofer) DC resistance. It is the DC resistance of the woofer voice coil.
Le is driver (woofer) inductance. It is the inductance of the woofer voice coil(not the 1.2mH of woofer filter). If you have a LCR meter you can have these values of the woofer voice coil.
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