Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Terrible bass

I was looking for some earbuds to replace the stock ones that came with my creative MuVo TX. Mostly I was looking for better sound isolation, so that I would hear more of my music and less outside noises. These headphones did an okay job of this, unfortunately the traffic sounds of outside were preferable to the music put out by these earbuds. The sound was tinny and flat, with practically no bass. I was amazed that these could be so much worse than my player's stock headphones. I tried the different plug sizes, and I'm sure I had them deep enough in my ears. Thoroughly dissapointing.