My testing anc:The easiest test when you compare these i found (since ab testing takes time) is to push he headphones down to increase the clamp. These are pretty great. Im anxious to try it for long-haul trip. Overall design was nice and comfortable but unfortunately did not work. The remaining 3 rings are worth the price you pay, unfortunately theyre just simplistic. Sono esatamente come in foto The plane took off and I put on my Audio Technicas. These are marked US 11 and EUR 44. Well made with lots of adjustments to customize the set up for two bikes. Someone probably bought it then decided they wanted the one with the dac, or something.