Probably not. If you're looking for a HU with a built in amp, you're not a big enough "audiophile" to notice a difference. You're an "average Joe" listener at that point. I highly doubt most of us on here would be able to tell the difference. FYI, I have my internal amp off on my 800PRS in my car and my 9855 in my Jeep. I can't tell a difference in SQ either way, but the HU does run more efficiently with the internal amp off; the backlights for the buttons don't dim at all with the music with the internal amp off, otherwise, they do.your an idoit if you get e built in amp in such a unit.. they don't use the internal amp because of crosstalk..my x991 has a built in amp but i turn it off.. the difference is minute in most situations but if your going to use such a highend deck and amps you will hear the difference..