Summary:
I DON,T KNOW ABOUT THE YPA 1020 BUT I HAVE TWO YPA 1000's AND THEY ARE VARY TIGHT SOUNDING AMPS BUT I DO LIKE MY H/K AMPS BETTER THEY JUST SOUND CLEANER TO ME BUT FOR THE LONGEST TIME I USED THE YAMAHA AMPS IN MY CAR AND I HAVE OWNED ALPINE,KICKER AND A FEW OTHER BUT I KEEP PUTING THE YAMAHA'S BACK IN BUT THEN I TRYED THE TC SERIES AMPS BY HARMAN/KARDON AND THATS THE SOUND I WAS LOOKING FOR IN MY CAR.AS FOR THE YPA'S THEY DO KICK ASS AND ARE VARY STIFF BUT THE H/K AND ONLY THE H/K IS BETTER.

YPA 1000 55+4 OR 120+2
BY THE WAY WHAT IS THE WATTAGE FOR THE YPA1020