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Unless my electronics degree is failing me.... this circuit does not work as a 12db/oct crossover. Its missing a capacitor on the woofer side, and nowhere in the documentation do they mention what ohm speakers to use! your only getting the tweeter filter, but ALL frequencies are going to the woofer. Meaning its only a 6db/octave on the woofer side. It will work, but not the best design.
I have purchased 8 of these for various audio projects and am pleased with them all. They definitely clean-up the signal to the tweeters,much clearer high notes,more definition in each symbol tap,not the constant metallic ringing that was present just using the supplied capacitor, such as what comes with Audiopipes #3721 tweeters. The woofer signal does not noticeably take away high notes,some speakers(pioneers)sound better to me using the woofer terminals,i couldnt tell a difference with Sony#6946 using or bypassing them and my NVX's i just bypassed this signal because they sound too good to mess with