Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Not very reliable...

When I first bought this sub, the sound was great. It integrated nicely with my DD 5.1 / DTS hometheater system. Now, one year later, it has a bad buzz that just won't go away even when no signal is being sent to it (not even CONNECTED to the amplifier). I guess you get what you pay for. My next purchase will definitely be of a better quality and hopefully much more durable.