[dukecv]

Hello all. New here.
     I am wanting to build a hopefully simple setup with 2 8" drivers and one tweeter per speaker. Probably of the tower version. The woofers I have are actually infinite baffle car drivers. They are the Oz Audio 200h. I know, i know, car drivers in a house system prolly wont work, but hey, they aren't going to get installed in my car anytime soon anyway. If you have heard of Oz Audio, you probably know they were some of the best in the industry, before the high ups in the company decided to sell out to foreign manufacturing, and end the company all together. Anyway these are proudly Made In America. Here are the specs on them. They are single voice coil. And this is all the info I can find on them. (pictures below)

 OZ-200H 8" High "Q" Sub
Fs=      59.01 Hz     Re=   3.1 Ohms
Qm=  1.739    Le=     0.41 mH
Qe=     0.955    Xmax=  8.0 mm
Qt=     0.616    Pmx=  150 W
Vas=  0.65 Ft3    SPL=  92.79 dB

As for the tweeter, I'm kinda undecided and am looking for some guidance. I only want to spend around $30 per tweet, unless its absolutely imperative to spend more. I am looking at getting the  Vifa DQ25SC16-04, 1" Titanium Dome Tweeter. Its none to special but seems it may do the trick.

I also need help with what to do for a crossover. I was originally thinking to try a 1st order at first but after doing some reading, I'm finding it might be a trial and error sort of thing. I need the most help on designing a crossover.

I am looking to build a ported enclosure, and I'm sure it will have to be of descent size since the Oz's are essentially infinite baffle drivers.
Any help is going to be super helpful, and thank you very much.

[JohnR]

Hi - I can't help wondering if you'd be better off starting with one of those kits that Madisound sells with that tweeter in it. The woofer isn't really well suited to a ported box and unless you want to get some measuring equipment, designing a crossover for it would be pretty hard. Not wanting to dampen your enthusiasm but I do feel the best advice would be rethink the project...

[face]

That woofer needs to be in a sealed cab or OB config, and that tweeter(as do most) would not like a 1st order crossover at all. 

[dukecv]

Well does anyone have any suggestions on how i can make all this work? I would really like to use the potential of the divers.

[JohnR]

I messed up the modeling, it's not as bad as I thought. You could use 1.5 cu ft tuned to 40 Hz. It's not ideal by any means but it will work. Have a go yourself : http://audio.claub.net/software/kougaard/ubmodel.html

[dukecv]

This is a great download John R. Thank you very much. After looking through some more tweeter ideas, I ran across the Vifa XT25SC90-04. This tweeter may suit my needs better, as the 8" will only go to 2kHz. Would you think a 4th order x-over would be the best for my situation? I'm thinking if I have the crossover point at 1.4kHz in 4th order (L-R), it might not be half bad. What do you think? And would you recommend doing a sealed enclosure over a ported one. And what do I do on the program if I do not have the Sd, Le2, & Re2?

Vifa XT25SC90-04
Impedance: 4 ohms
Re: 3.1 ohms
Frequency response: 837-40,000 Hz
Fs: 837 Hz
SPL: 91.7 dB

Once again, thank you very much for your help. Every bit helps.

[JohnR]

1.4 kHz would probably be pushing it for that tweeter - I found a couple of projects online that crossed it at 2.8 kHz and 3.5 kHz. My inclination would be to go active but I'm not sure if you have budget constraints or project goals that would prevent it.

I don't have the models on this computer, but as I recall the sealed box would probably require a sub.