I'd trust the authenticity of hertz speakers coming from haroon radio. The market is filled with fake hertz, jbl, hk, focal products. Something to keep in mind.
What headunit do you have? This is important since you are planning on running a 4 channel amp and a amped subwoofer
An active sub is the way to go ofcourse since you are planning on going with 4 speakers on the 4 channel amp. If you were going for a front stage and a sub, you could have bridged the 2 rear channels of the amp to power the sub.
15k+ for a kwnwood 3010 sub? Better to get a jbl CS1214.
Kingvox is a Chinese ripoff amp. Don't get it. I'd go for the nakamichi or say a pioneer 6704. It's expensive but it's a under-rated (literally) amp that has more juice on a bench test than stated by pioneer.
Go for a atleast true 8 awg ofc wiring. Cleaner power means the amp runs more efficiently
