I purchased 2 pair of these Motorola S805 DJ headphones. I can't believe how lousy these headphones sound. I am not new to stereo bluetooth as I have 2 Jabra sets, the 810 and 620S which are significantly better even though much older. The high notes rattle at any volume. Motorola has no firmware updates available for these.Motorola, you let me down again. When will I learn?