So I'm about 10 years loyal Koss Porta Pro customer and had until the introduction of the KTC no problems. Since I use this model (about 1.5 years) I have two "vrschlissen" which is always a question of a Fehlfuktion / loose connection at the battery plug. The processing does not look cheap, but appears to be so. The jack, which is claimed normal with me (iPhone in jacket pockets, pockets etc.) is processed qualitatively insufficient. I wonder now, turn to pivot back to the old model, but I miss the KTC function then very ... I hope KOSS gets the quality problem under control.
Due to these problems there are only 2 star ... otherwise I would give the headphones 5 stars
