Most of the time the problem comes from misunderstanding exactly what frequencies affect the bass instrument. Too many times we think that it’s the frequencies below 100Hz (especially 60Hz) that provide the bass we need. While it’s quite true that those frequencies are important for what we might call the girth of the sound, they won’t reproduce well on small speakers, and that’s where the problem lies. In other words, EQing too low.
Below 100Hz Girth
120Hz to 200Hz Bottom
250Hz to 320Hz Low-end definition
1kHz to 1.5kHz High-end definition
2.5kHz to 3kHz String noise/buzz