Extremely resistant to feedback, thanks to the directivity of the proximity effect higher than usual, recommended LC about 150 Hz. The bass is accurate, deep, without ballooning, the midrange is neutral with appropriately emphasized highs (less than beta 58). For me, satisfaction and joy, I recommend. Made in Germany - serial number, measurement protocol with date, place and signature. Premium class, nothing that would fall into the bucket at the end of a Chinese production line.