3-way passive crossover step-by-step

[kubac]

I'll very appreciate your help with my first 3-way crossover.

1. What would be the best crossover frequencies?? I thought 500Hz and 3kHz would be fine.

2. Which type of crossover would be the best considering the complexity and number of components?? I've studied lots of materials on the net and decided to use 2th or 4th order Linkwitz-Riley or 3th order Butterworth.

3. I know the result will lead to weeks of alchemy with crossover components....

I'm gonna use these drivers:
www.kubulin.kgb.cz/specs/basak.html ...as a woofer
www.kubulin.kgb.cz/specs/stredak.html ...as a mid-range
www.kubulin.kgb.cz/specs/vejskac.html ....as a tweeter
www.kubulin.kgb.cz/specs/vse.gif ...nice graph

So, whats your opinion about this?
Thnx a lot.

[Guss]

You will need a LCR filter to get rid of that breakup in the woofer's response... Going 3way is tough and there a lot of manipulation to realize, have you got winISD, it can help alot to get your box sounding the way you want though it won't be of any help to improve the way you implement the drivers with each other. If you think you can figure out how to build/assemble your crossover yourself than may I suggest to blend the mid and the tweeter first and get them sounding right and then, implement the sub to the xover.

You are not given the FS of the tweeter but I suggest you could go lower than 3k using a LCR again on the tweeter... This way you avoid the non-linearity of your mid in the upper freqs...

[kubac]

LRC means notch filter?? ...my technical English isn't prime

Breakup in woofer's response... you mean the peak around circa 180Hz?? And LRC on mid because of the peak at 4kHz??

I've got WinISD, but still must learn how to handle accurately.

I forgive the 3rd or 4th order crossover. 2nd Linkwitz or Butterworth will be more fitting for me (less dificult to assemble).

There's a problem with lower xover freq. Tweeter's response is 2.5-18k. So 2.5k is the limit, isn't it?

Thanks for your advice.

[kubac]

Ugh... I work too much.... Of course, LRC on the tweeter (not on mid). Now it's clear. And for woofer, you meant zobel filter or resonance equalization. That's clear either. Sorry for misunderstanding.

[Guss]

Originally posted by kubac
Ugh... I work too much.... Of course, LRC on the tweeter (not on mid). Now it's clear. And for woofer, you meant zobel filter or resonance equalization. That's clear either. Sorry for misunderstanding.

Kubac,
Yeah thats it for the tweeter AND the woofer, an LCR ( inductor, capacitor and resistor )...A Zobel... its up to you ! You have roughly two option to get rid of that peak, an higher Order setup or an LCR...

About the mid unit, I meant that you could set a lower xover freq. Using any other component as a LCR here would be useless, just use butterworth...

May I suggest that you revise your project, a 3 way speaker is hard to design and build as well. Have you looked at other speakers? You should consider 2 way using better units. What are you looking for ? big bass, loud music ? have you considered 2.5 way yet ?

[kubac]

I'll try 2.5kHz for mid/tweet, it looks like good solution to me.

I've got these speakers and want to make them sound as well as possible (they aren't too bad, I don't want to trash them yet ). If it don't work I'm gonna use some others in 2-way system, maybe with vented boxes. That's my plan, partly because of lack of money.

I decided to use 2nd order Butterworth definitely.

regards
K