The K309 is in the tradition of the Viennese manufacturer AKG: Very clean mids and undistorted highs, but no bass. But one has in classical recordings breadth and depth of view. Also good in the illustration, traditional folk and blues tracks. For the latest music with powerful bass, the listener is less suitable. The fit in the ear is still good. I prefer listening without upholstery. At Sony NWZ 639 me the Concierto de Aranjuez and John Hiatt`s Same Old particularly liked one. Conclusion a very good listener for special material. Pricewise an absolute bargain - not 5 euros for the brown model on Amazon.
