That was a rushed and limited test case scenario.
Put your ear directly in front of the tweeter and woofer - listen closely and carefully; particularly when placing the unshielded interconnects adjacent to other noisy electrical cords and open jacks on the back of the receiver-amplifier (yes, where you actually plug things into), not just waiving the cable around in the air. Duh.
It can be worse with big A/V receivers too. The "noise" is there if you listen carefully. Some people understand attention to detail better than others before making videos. Not in this case.