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English: Discount code to purchase this Fosi! https://www.amazon.com.mx/dp/B0CLP4T5L7 Code: 4JQJ-YQJ7LV-LPSWAZ In this video I do my most complete review I've done with the Fosi ZA3 amplifier, I compare it with a class A / B equipment and I give it to you at the end. 0:00 Introduction 0:59 Unboxing 2:12 Outside view 2:47 Specifications 3:52 Power at 8 ohms stereo 5:41 Power at 4 ohms stereo 6:21 Power at 8 ohms mono 8:00 Power at 4 ohms mono 9:05 Inside view 10:49 Comparison with class A / B 15:01 Frequency response 17:36 Test conclusions 20:08 Speaker connection 20:40 Sound test 22:43 Raffle