OVERRATED Mastering Tip: "Cut the sides up to 100Hz". 🚨 This tip is not bad, but just overused and usually when it's not needed at all. To use this technique to its maximum, you'll first need to have experienced ears and some high-end monitors/headphones to actually be able to tell the difference with/without this filter on. "Use a high-pass side channel filter"...mistake. What is shelf filter works better than high-pass? Think about that.