3 way crossover build help

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Hello there I have my open baffle speakers built in a three way set up. I have one 12inch woofer evm 12l, a 10inch evm 10m and a temporary Boston Acoustics tweeter from the cr7s.

My question is what crossover is nessesary to drive these speakers to achieve the best sound quality?

I am either going to make one myself or buy one off of eBay. On eBay I see a lot of crossovers that say 625hz to 5k hz, from my knowledge i think I am going to need something capable of a lower frequency. Is this correct? Any recommendations or build suggestions are appreciated.

This is my first post on this forum but have been using this site for reference for a few years now. *Cheers*
To determine the crossover, the best way is to measure the driver's frequency and impedance (this for passive crossovers) responses individually that are built into the actual baffle. This two basic measurement is a good starting point for modelling the crossover, but other measurements (distortion, off-axis response etc.) may require for success.
So, a dipole 3-way speaker as first diy design project. Sounds familiar, I started with a dipole 4-way...

Eveugene, you must read a lot of basics of loudspeaker design - driver types, radiation patterns, distortion behaviour, excursion/spl capacity, baffle diffractions, crossover types, multiple driver interferences etc. simple things. Then start learning how to play with those parameters, find best combinations.

It will be a long and winding road. Many books and websites give info of "normal" speaker design, but for multi-way dipoles please study these

Linkwitz Lab - Loudspeaker Design
Dipolplus - Alles über offene Schallwände (in German, but a pdf in English available)
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Thanks for the tip @AllenB

Why so? A more accurate measurement ?
I think I meant that reply for another thread. My apologies.

An open baffle is an easy way to get started. The tradeoffs and complexities are greater than for a simple box speaker.

If you are going to do a good crossover for one of these, you also need to have an understanding of what it will do in your room, that is.. what it does, and how you use it. What it does comes on many levels, and one of them is a varying radiation with direction and frequency.

On the other hand you can have fun with this, tune it by ear, decide what range each driver can handle, make changes.
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