Instruct: Classify Amazon reviews into positive or negative sentiment
Query: good but.

These are good headphones when I can hear through them. I bought them to connect to my television so I could watch at night without disturbing my wife while she sleeps. Surprize...these things get no signal coming through them if the volume on the tv set is turned way down or muted. What is the purpose of head phones if they are dependant on having the volume turned up at the source?