I have a speaker I'm thinking of building and (as a learning experience) I want to make the crossover myself. However, before I embark on this journey I have some questions.
I am thinking of using an
8" Goldwood woofer in an open baffle with
this tweeter. To cross this over, I was planning on using a second order Linkwitz-Riley circuit crossed at 2250 Hz. Because the woofer in an open baffle alignment can easily overexcurse itself below 80Hz, I was going to also put in a low order highpass.
Here are my questions:
1. The power handling of the woofer is 65 watts and the power handling of the tweeter is 40 watts. What can I assume is the total power handling? Do I use the lower value, sum them, or what?
2. The impedance of the woofer is 8 ohms and the tweeter is 6 ohms. What can I assume is the total speaker impedance? Is it calculated in the same way as resistors in parallel?
3. For the crossover capacitor and inductor values, do I calculate it using the "nominal impedance" (8 and 6 ohms) or do I use the DC resistance values?
4. Do I simply wire up the highpass circuit before the LR or will there be some sort of interation between the two? Perhaps should I only wire it up to the woofer's part of the circuit?
I apoligize if these seem real basic but I can't seem to find a good information resource that is more comprehensive then Wikipedia but more basic then the Loudspeaker Design Cookbook. Any additional comments are welcome.