Active crossover

To acheive compensate for smooth baffle step in the Spira is easily accomplished with a few electronics.

The 4th order l-r crossover, wirewrapped 22 opamps, 50 caps and 50 resistors, 1A per rail voltage regulators 4700uf cap per rail for the supply and a cheap wall wort suppying the juice. I had a couple of opamps ocillate which made the diaphram of the speaker fully extend at about 3hz, looked cool though, bypass caps need to be really close to the IC's, i tried to lay it out to have shortest connections but i still pickup the weirdest radio interference once or twice a month. Below the crossover is a 24-bit DAC and AC3 decoder, SB extigy

 

ron elliots l-r crossover diagram, doesnt inculde bypass caps or baffle step compensation