This is the first time I've been disappointed with a Koss product and I have or have had everything from the 70's Pro4AA to my 9th kit the BT540i which I absolutely love last year . These BT115i are lightweight, easy to set up and use, have great battery life and are comfortable to wear. The reason for the bad rating is the sound! Solid bass, no highs, and very poor mids mean the sound is always boomy and dirty, with poor vocals and spatial imaging. My PortaPro cables and even my old spark plugs are much better. It's hard to complain about the cost, but even my relatively inexpensive UA40 outdoor phones, which cost about the same, are much better. My Pro4S are still the benchmark of course (yes I've had 11 sets of Koss stereos and would happily recommend them for their sound quality and durability) but I won't be training with them! I don't know if those are driver items, bluetooth/codec right? But they sound more like portable subwoofers!
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