K4-450 is a 4 output channel power amplifier, 450w @8ohms, 700watt @ 4ohms.
SK-20 is a 610MHz -690MHz UHF wireless system with two handheld microphones (can also be replaced with headset microphones) (if you are not interested in singing, you can also remove SK-20)
KP612 is a single twelve-inch speaker with a power of 350w @ 8ohms.
This solution is similar to solution 2, except that the output channels and speakers are reduced. Similarly, if you don't need a microphone, you can remove it. Or you can replace it with a wired microphone.