Originally Posted by radarfire
What was maximum volume on the factory radio is half volume on the Sony.
That's EXACTLY why I'd like to know the input voltage spec for the Crossfire crossover/amp. Your installation sounds like the head is overdriving the amp. But hey, if it sounds good to you, then congrats! Me, I'd like to know the spec and find a head unit with matching voltage. Hopefully for your situation the factory crossover/amp is tolerant if you DO have a mis-match.