Very easy to add resistors if you find it loud.I went with the Kenwood 3 1/2s. They are hard to get right now with all the supply issues, but they are beautiful sounding. I did all 3 1/2's.. From my understanding, since the factory are 8 ohms, and plugging in 4ohms, they may be a little "harsh" based on some people's experiences. If that works out to be true for your ears, consider the kenwoods...