it is hard to say what the output would be since they are all different frequencies. how well the frequencies couple with each other will determine how loud they get. generally speaking, you want to couple one freq with another that is twice the original freq. if possible, get another that is 3 times the original freq. if we could get a 200 hz, a 400 hz, and a 600 hz, i think that would be insane for a horn

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2.4" front/1" rear leveling kit - toyo A/T 285/75/18 tires - bull bar with hella 500FF lights - 20% tint side and back windows - 55% full windshield tint
in the works:
stock HU -> LOC -> PPI FRX-456 -> DLS A4 + Marathon 6150 -> DLS iridium 6.2 comps + Hybrid-Audio L3's + 4 Tang Band W6-1139SI's
to come:
JBL MS-8 + center channel speaker + components for the rear + sirius adapter for stock HU