Mastering Room Stefan Brüggemann Berlin WE CARE ABOUT THE SOUND OF YOUR MUSIC. Mastering Room is an audio mastering studio located in Berlin, founded and operated by Stefan Brüggemann, a specialist mastering engineer with more than 20 years of work experience as well as numerous international references. We offer a full range of high quality mastering services, for CD, vinyl and digital release, including Stem Mastering and Audio Restoration. WE LIKE TO LISTEN...TO YOU AND YOUR MUSIC. Communication is an important part of the mastering process. Each project is unique and approached with respect, so every mastering process varies depending on the specific needs. Please get in touch for more information and to discuss the details of your project.