James M. Harrell, Jr. PE with his Jumping Cactus Loudspeakers - Per James, "A highly recommended upgrade is to include an electronic crossover from Marchland Electronics and Tri-Amp the Jumping Cactus Speakers, along with a separate Subwoofer. The fully assembled and tested unit is "XM 44-4AA Electronic crossover, 4-way model" (Their price list is included on their website)."

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