I bought this a few weeks and I expect to be able to listen to it before giving an opinion. I knew the reputation of Koss and PORTAPRO model is the catalog for many years. The sound is clean, neat and without Towing, bass are present but not invasive, the highs are chiseled and precise without aggression, the medium is well structured, short, this is a very good helmet. The look is a bit shaky but in reality it cash without flinching, it is further guaranteed for life! I even bought a second for my son (he struck me all the time mine!) At the price it is proposed, it is a real bargain, not a product sold off.
