Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Wow; what a change!!

Very well built & executed power supply. But the output board had 8 JRC op-amps. This would put a hold on everything behind it Like the Reialta engine and great power supply. So in went 8- AD 8620B amps And Now I can hear WAYYYYY deeper into the music. Movies have lots more impact too. Robo-FET