Volume level is set too high.
- Decrease the volume. Turn off EXB effect.
Sound source is distorted.
- If original sound source file is poor quality, distortion and noise are easily noticed with high-power speakers. Try a different audio source such as a music CD through the aux jack.
- If you are using an iPod Shuffle or external sound source like older generation iPod, try reducing the output volume on the device itself. Also, try turning the iPod bass boost OFF.