I'm trying to come up with a basic two-way crossover for a speaker I'm building out of scrap. (Working with what I've got - no new parts.) My amp handles 8-16 ohms.
Here's what I've come up with for a speaker design so far:
I've just got the one inductor, but I've got a ton of different capacitors. I'm planning to build the capacitor out of a combination of smaller ones in parallel. (10, 5, 1, and 0.5.)
My primary question is: How would I calculate the nominal impedance?
Secondary questions: - I believe this crossover is set to 12kHz; did I do my math right for this? - Since the tweeter is 6 ohms, will be attenuated enough so that it won't overwhelm the woofers?
Additional info: - I'm not looking for this to be a fancy system. Just something that will sound ok and not blow up my amp. - This is really just a re-working of the existing components in the original speaker. My intention was just to see if I could adjust a few things and increase the impedance to >8 ohms. (So it won't blow up my amp...) - I based my design on the series circuit in figure 1.1 here.
A bit of background: I pulled apart a pair of Samsung surround speakers (3 ohm) and I'm trying to make it into something I can use with my RCA STAV-4090 receiver. The exact driver models are a mystery - no spec sheets available, unfortunately. Two of the four speakers say "F30C-D998-1 75108" and the other two say "F30C-D998-1 74208". (The difference being 51 vs 42 - any ideas what they could mean?)
From what I can see, here's what the circuit looked like in the original:
I believe this circuit was a cheap attempt at a three-way crossover? The tweeter gets a high-pass, the center driver effectively gets a low-pass from the leftover, and the bottom driver has its own low-pass filter. (Is this right?)