Deciding an EQ's Center Frequencies
The audible range is about 10 octaves, and usually the center frequencies of a graphic equalizer would be distributed equally spaced on a log scale to cover that range. Common equalizers have either $30$ bands (with $1/3$ octave filters) or $10$ bands (with $1$ octave filters).

If you want $5$ bands, you could choose filters that cover approximately $2$ octaves. The five center frequencies would then be something like

\begin{matrix}
30\,\text{Hz} &amp; 125\,\text{Hz} &amp; 500\,\text{Hz} &amp;2\,\text{kHz} &amp;8\,\text{kHz}
\end{matrix}

If you have an equalizer like that I'm not sure if an additional bass boost button makes much sense. If you want $6$ frequencies, just divide the $10$ octaves into $6$ equally spaced bands (on a log scale).