Need help with xover design.

[demon2091tb]

Guys i've finally gotten all of my drivers, but now i need a passive xover design, i'd like one professionally made, but if i can do it myself, why not. I just need help with the design, and diagrams.....i can build it myself. Drivers are RS225-8, WR125, and LPG 26nafm, i'd really like the best SQ i can get.

I know a few of you guys have used the drivers, so your input on ranges and ideal points, slopes would be nice.

[MiniVanMan]

First, where are they going to be mounted? 8s in the doors, but how far apart will the rest be?

Given that information I can make a much better determination on where your slopes should be, what points, and whether Butterworth or Linkwitz-Reilly.

[cotdt]

This is for his home setup, a long story of posts from demon.

Hey man, you need to make the box first and take the measurements of the drivers mounted in the box that you will be using. Then designing the crossovers will be easy since those are well-known drivers and we already know what frequencies the drivers are good at. I can do it in 5 minutes since it's not too different from my own 3-way (RS225-8, Vifa XG18, Seas H1283 3/4" tweeter). So if you are looking for the crossovers to be professionally done, you'll still have to send them the box for measurements. I use LEAP which can appromixate the box response from the infinite baffle measurements, but I don't think those exist either. So if you can get the measurements then you'll be in great shape.

[demon2091tb]

Thanks cotdt, no way for me to measure them though, i was hoping that i could use the generic t/s params that Dang got while he tested them. But i doubt that would work as well as i had wanted.

Yes this is a Home setup.

[cotdt]

Awww no one can measure them for you around your place? I can measure them for you if you're willing to pay for shipping, or you can find someone locally around your place.

t/s parameters would work for the woofer, but i don't see how they would work for the mids and tweeter. in any case you'll need measurements, preferably in the box but infinite baffle might do, too.

[demon2091tb]

what would be the cheapest way of measureing them, that overall would give me the cleanest numbers. Are there any programs, and instruments that i could buy, that are relatively cheap that would work well.

I do know i want like 250-6/7k on the midrange, keep the tweet to 7/8k and up, and woofer down from 250hz - 30/40hz, and all be rather flat, with a mix of on and off axis response for best imagining and such.

[cotdt]

You can get a measurement mic for $40 or make your own for pennies, Linkwitz documents it on his site. The mic preamp/phantom supply is around $50. Sorry it's not as cheap as you like, but you will like the fruits of all this speaker research. I know I have. Send me a PM and I can email you measurement software. I think MLS gives cleaner numbers than RTA techniques, but not sure.

The WR125 starts to break up at 4kHz, so I wouldn't cross as high as 6kHz, more like 3.5-4.0kHz. The LPG's should do just fine at this crossover point. I expect the RS225 to do the lower midrange better than the WR125, so I would make the crossover point higher, not sure where though.