Okay, so this item gets 4 instead of 5.1. The addition is somewhat misleading. Amplifier 20 watts, not 100 as the name suggests. The description says 20 watts. Hence, most of the negative reviews come from people who didn't read the descriptions. They think they need a 100 watt amp. But this speaker is just a 50 watt speaker with 100 watts of peak power. Very loud with 20W amplifier. If you were to use more than 50 amps I'm sure the sound quality would be abysmal.2. It is a pity that the amplifier is delivered without a power supply unit. Not the end of the world. I have some 12v power supplies lying around. I use 3A and have tried 1A, both worked fine, so 5A is not 100% necessary in my opinion. So this system will do whatever you want and need. She does her job!
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