Multi Level 3 way x-over, passive

Any electrical engineer types care to help me out ?    I would like to split up a full range signal (approx 100W) into 3 streams. 1. 200Hz + 2. 100Hz to 500Hz 3. 500Hz + All speakers are 4 ohm. x-over should show amp 4 ohms if possible. I can run a solder gun, and know how to bread board, but its the overlapping bands that get me. If I had a diagram........ :-)

If I read your post correctly, you are looking for a high pass at 200Hz, a bandpass of 100 to 500 Hz, and another high pass at 500Hz... Am I correct? If this is so, now I need to know what slope are you looking for? A simple 6dB, or 12dB, 18... What? Why are you looking into such an overlapping bandwidth? That's a pretty good margin... If my first sentence (question) is correct, your amp will see 4 ohms up to 200Hz, 1.3 ohms 200 to 500, and 2 ohms above 500. This can be fixed, to present the amp with a more even load, but it involves series resistors, and this will KILL your output. Example - a 2.6 ohm resistor in the 200 to 500 band will reduce your output by 9dB! OUCH! I am thinking this will not likely be a good idea... Please let me know if my assumptions are right.It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."

Exactly. And I think a 12dB slope would do. Amp can handle ranges you describe, and can adjust gains accordingly. Did not realize the loss would be so great, but this is an experiment that I am willing to at least try. about 8 years ago, I worked at an install shop. Didn't do the serious custom jobs but know my way around a 12V system.   Oddly, I work on computers now, just never learned the details of building a passive.    If it doesn't work, I toss it. Thnx for reply.   Don't burn your brain on the whys...:-)

Fair enough... 200Hz high pass @ 12dB components are here: L=4.5mH C=140.63microF Using the same schematic, 500Hz high pass values are: L=1.8mH C=56.25microF Your bandpass schematic is here: And your values are: C2=361.80microF C3=25.38microF L2=18.41mH L3=1.50mHIt all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."