I wear between 7. I am a professional organizer and I like to sample products before I recommend them to a client. Works great on ?S? and ?T? and ?K? sounds, but does virtually nothing to block the ?P? pops. Ive had conversations with their tech support department and they have sent me replacement chargers and even issued a RMA for a replacement. It works great though and I would buy another if I had more room to hang one. I was Amazed how good this sounds! My son is so upset. Everything was packaged nice and neat. It has easy access for plugging in the charging cable. Many roof racks do not have a high capacity rating, pay attention!