From the beginning when I bought them, as soon as I connected them to my computer (with usb) without playing anything, they make a whistling noise.. as I increase the volume, this noise gets louder too.. I don't know what could be wrong if it's a cable or connectivity issue but I am disappointed

I have them for about 8 months and I can say that for music production, at least in the mini monitor studio category (because they are also 4-inch), they hit so hard that sometimes I hear my neighbor's child telling my roommate how loud the music sounds (and all this at half or maybe a little more than 3/5 of the maximum volume)....!!!!
To play them at full blast, you need a good room with soundproofing, something that I personally don't have, and overall I am satisfied with my Mackie speakers for the quality and price ratio!!!!
I bought them for 119 and I also got desk stands to hear the high frequencies exactly in the center of my ears, as every music producer should do

Wanting to replace my old Creative Inspire 5.1 5100 computer speakers, I preferred to buy studio speakers for better sound quality for music, movies, and gaming. After a lot of research, I chose the Mackie CR4-X. The result, after a week of heavy use and testing, is that it is a very good speaker set with fantastic bass and mid-range response, and very good treble. Its volume is more than enough for anything you want to do, even parties. If paired with a good equalizer through a PC, it can work wonders. If you are interested in music production, Mackie also offers codes to download Pro Tools.