I'm trying to understand what ferrite bead he chose as shown in the picture. It says it is a 120R ferrite bead but from what I understand, when looking for a ferrite bead, you have to know the frequency you want to filter be in the resistive range on the component's ZRX chart.
So what frequency range is he filtering here? And is this the correct way to notate a ferrite bead, as opposed to labeling the component something like "60 Ω @ 50 kHz"?
I am a bit new to the electronics field so excuse me if I am missing something obvious. The schematic is from Phil's lab's YouTube channel showing how he made an amplifier with NE5532 op-amps.