NAudio frequency band intensity

Question

I have an audio player using NAudio and I would like to display a real time intensity for each frequency band.

I have an event triggered for each block of 1024 samples:

public void Update(Complex[] fftResults)
{
   // ??
}

What i would like to have is an array of numbers indicating the intensity of each frequency band. Lets say I would like to divide the window into 16 bands.

For example when there are more bass frequencies it could look like this:

░░░░░░░░░░░░░░░░
▓▓▓░░░░░░░░░░░░░
▓▓▓░░░░░░░░░░░░░
▓▓▓▓░░░░░░░░░░░░
▓▓▓▓▓░░░░░░░░░░░
▓▓▓▓▓▓▓▓░░░▓░░▓░

What should I put into that event handler if this is possible with that data?

Data coming (Complex[]) has already been transformed with the FFT. It is a stereo stream.

First try:

double[] bandIntensity = new double[16] { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };

public void Update(Complex[] fftResults)
{
    // using half fftResults because the others are just mirrored
    int band = 0;
    for (int n = 0; n < fftResults.Length/2; n++)
    {
        band = (int)(.5 * n / fftResults.Length * bandIntensity.Length);
        bandIntensity[band] += Math.Sqrt(fftResults[n].X * fftResults[n].X + fftResults[n].Y * fftResults[n].Y);
        bandIntensity[band] /= 2;
    }
}

The above is doing something but I think too much goes into the first two bands, and I'm playing shakira which does not have that much bass.

Thanks!