I have a pair of B&W 683 S2 speakers. These have measured dips at around 2k hz, and 6k hz. There is a smaller peak at 3.7k hz and a peak at 10k hz. The review at Stereophile makes note of the dip at 2k hz. I tried to equalize that one out using the 1/3 octave graphic equalizer for Foobar2000, but it made the sound hard. Next I decided to try to flatten the frequency response of all 4 divergences. I installed support for VST plugins. After some experimentation, I found ReaEQ, a free parametric equalizer worked the best in that it was easiest to adjust and crashed the least on my Win 10/64 machine. The harshness went away and the sound was very smooth. In all honesty, I have not done enough listening to determine if I am better off not trying to alter the frequency response at all. Is anyone else doing something like this? What software are you using? Any other thoughts?