It sounds like you've made some great improvements to your headphones!

Troquei means "to change" or "to swap out", so I assume you replaced the original ear tips with new, firmer ones. This can make a huge difference in sound quality, especially when it comes to bass response.

By swapping to harder ear tips, you've likely increased the seal around your ears, which allows for a more accurate and immersive listening experience. The added pressure from the firmer ear tips helps to block out external noise and keep the music inside, where it belongs!

The result is a more balanced sound with deeper bass notes that can really bring out the best in City Pop music from Japan. That genre is all about smooth, laid-back grooves and catchy melodies, so it's great that you're enjoying it even more now.

Keep on rocking (or should I say, keep on pop-ing?)!