Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Thin weak sound

I had read great things about the ER6i's, so with Amazon having a great price on these headphones I figured I would give them a try. Plugged them in and tried a variety of music and the sound was consistently thin and weak. I tried them with the flanges, the foam ear buds and nothing improved the sound. There is literally no bass and the volume has to be cranked up to get decent sound. These will be going back to Amazon.