Has had 3 owners. This unit was professionally repaired about 2-3 years ago now. It’s in great shape & sounds amazing! The auto calibration systems works as intended I have extra videos & audio captures below feel free to ask for more I’ll upload them in the drive below. https://drive.google.com/drive/folders/1WoUx_SAHyqNGz3eU22CzXYF2gs35K4sB