If I use speaker bars headphone output the speaker bar will crackle loudly, so I just plug it into the headphone jack on my computer tower instead. We have an 18? center console boat that we take to the beach and anchor bow out. They fit huge too, my daughter wears a size 1 and a 13 is hanging off her foot. I?m a size seven so I ordered an eight and I think I would really need a ten! Surprisingly the 4s fit! After just a couple hours wearing them on and off around the house, they ripped open (as pictured). Got my foot fully seated, which is better than the other 2 sandals I ordered and returned. Bundesliga, kopfhörertechnisch, auf und stelle fest: Profilauschen macht ja eine enorme Freude. They are comfortable to wear and fold into a compact carrying case (sold separately). I bought these for my wife to use on recent 14-hour flights to and from China.