I am at present using a Phoenix gold automotive active crossover. My amps are still in the audition, alteration stage. I recently purchased two 22-0-22V toroidal transformers for when the times that my amps get mounted inside my monitors. I am contemplating balanced inputs as well as active crossovers. I will need +/-15vdc to +/-18vdc. Should I use a smaller secondary toroid per speaker for this auxillary power?