Genelec 8330 APM

I have been preparing to buy Genelec for a long time and in the end I decided and ordered despite the fact that it is a global crisis. Once they arrived I installed them and started calibrating the room because I also ordered GLM. I noticed that the speakers were a bit strange and decided to test them with a tone generator. I started testing them left to right separately at different frequencies. One of the monitors started distorting below 115hz. The distortion did not come from the box itself or from the driver, it sounded as if the input preamp was damaged. To be sure, I changed the cables, changed the sound card outputs, changed the power plugs but unfortunately nothing changed and the distortion of one monitor continued to occur. Thomann's team was very professional, I sent one monitor back and they sent me a new one immediately. Now everything its fine tanks to the Thomann team 🙏🏽