You're on the right track here!!
I'm running 2 of the SPG-555 in my 07 Avalanche. Each one has a dedicated PDX-1000 and the rest of the components(BA Pros) running on a PDX-4.150. The subs hit hard and everything is sonically correct. The amps get very hot, which is a concern, and they suck a LOT of power. I'm running 2 yellow tops with an isolator and I still have problems with lights dimming.
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