I ordered two 4-pi crossovers and changed the resistors to the 20 and 30 ohm and used with the 3-pi speakers around 1-2 years ago . I ended up changing the 20 uf to a 12 uf cap and shorting out the .5 millihenery choke in the low end circuit. I also changed the resistors to a lower value. Now the 3-pi crossover has been changed to two 10 uf caps. in the woofer circuit. Ok the newer one sounds right to me and now works right with the 20 plus 30 ohm resistors which equal out to 25 ohms resistance. I thought the 4-pi and 3-pi were using the same crossover besides the resistor values being different. Well anyway It works great now. I am using the delta12lfa and the Psd2002.
Wayne Parham Messages: 18711 Registered: January 2001
Illuminati (33rd Degree)
For a while, the three π and four π crossovers were the same, except for the Zobel and the R1/R2/C1 values. But in 2008 and 2009, I started going through each of my designs with the WTPro system, doing further optimizations where possible. The polars were already pretty good, but after WTPro optimization, I'd say they're best of class.
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. I didnt look close enough on the schematic. Thanks !!! 
