Need Assistance with PC Speakers (Crossover Design)

Well....Maybe you saw my thread on the Logitech speakers overhaul. It seemed to work alright, but I think my luck finally ran out, and now they do not. Trust me, I've gone through every possible thing...

So now I need some PC speakers. I have 2x HiVi M4N Midbass speakers already so I'll be basing it off of them. I'd like to do a 2.0 setup with one M4N in each satellite. I'd also like to have a midrange/full frequency and a tweeter. So 3 speakers in total. 

For the amp, I believe I will be using the LM4780. I think I can handle the amp myself alright. It is the crossovers that confuse me the most.

I've just spent the last 2 hours trying to understand crossovers and I'm still utterly lost. I understand that I will need 2 crossovers if I am going to have 3 speakers. What I don't get is how to calculate the values for the components. How do I determine what the crossover frequency should be?

What information do I need to know about the speakers? 

These are the speakers I will be/thinking of using. I like Hivi so I might just stick with them.

M4N: http://swanspeaker.com/products/products.aspx?cid=9&sid=50&pid=153

B2S: http://swanspeaker.com/products/products.aspx?cid=9&sid=50&pid=149

TN25: http://swanspeaker.com/products/products.aspx?cid=9&sid=53&pid=174

I appreciate any help that anyone has to offer. I don't see any freqency ranges on the actual datasheets there. There are graphs but I can't tell what the actual ranges are. Anyone know?

I'm sorry to be such a pester, but I'm lost.

Thanks.

Thanks for all of the responses.

I'm still confused as to what numbers I should be looking at to find the High Crossover Frequency and the Low Crossover Frequency. On the datasheets I listed for the speakers I'd like to use....what information do I look at.

I have a much better understanding of the whole deal, but it's just not clicking.

Thanks again.

Okay thank you. I actually found a crossover design on Parts Express that perfectly suited my needed. The design uses the same exact drivers as I will be using. Thanks.
 

Quote:

Originally Posted by Avro_Arrow 

One value to look for is resonance frequency.

A drivers response starts to fall off quickly

below resonance. Look for the high frequency

drivers resonance frequency, thats the place

to start thinking about your x-over point.

You will also need to know the characteristic

impedance of the driver at the x-over point.

 

For designing the box you will need the Theile/Small parameters.

I'm going to try to build an LM4780.

I'd like to use this kit from hifidiy.net:   http://shop2.hifidiy.net/index.php?main_page=product_info&cPath=20&products_id=78

There is a bit of a language barrier on the site. The actual products seem to be of excellent quality, but I'm not quite understanding what is being said.

It says it is a dual channel amplifier board. From the picture  see only two holes dedicated to speaker output....So wouldn't that technically be only single channel, bridge configuration? Are you supposed to attach the - somewhere different...and the positives only in those two big wholes marked OUT.

V- and V+ would power supply in, right?

OUT would be speaker out

IN would be source input

G G would be power supply ground

G would be...?

I don't see how that is a dual channel setup? Am I wrong?

So speaker - (negative) hooks up to one of the G G? And speaker + (positive) to one of the OUTs?

Thanks.