Ran Alpine's PXE unit today for amp. I found out that the frequency response (from AntEQ result) of the head unit is not too good. There's a boost at 80Hz, crosses 0 at 60Hz and going down sharply. There's a boost at 850, then a dip around 1.5k and then a boost around 3k then it gradually roll off. I don't think connecting the head unit directly to any amp will sound good though. What opinions do you have?
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