Is the default equalizer app in foobar accurate though? It's only 18 bands.
This plugin enables a 31 band equalizer, maybe you can get a more intricate result?
I use that eq for my tuning needs. It is a little bit of a pain in the A to use, but if you know what frequencies you want to play with, its quick to set up and it automatically tweaks gain to reduce distortion.
So far, I've done nothing to the HE's but drop 1 khz 3 dB and surrounding freqs by 1-2 dB. This picked up the midbass slightly (to my ears). The HE's have a major dip to 2 khz, and then ramp up hard to about 10 khz (about 10 dB over 2 Khz). I tried dropping 10 khz 2-3dB and scaling back through 3-5 khz by similar amounts. I didn't really like it.
With the 31 band EQ, if you really want to get nutty, you can actually make adjustments to each channel - though I am not sure why you would do this. I set and forget.
The HE's take really well to EQ adjustments. Though you should be aware that the freq response is so "flat" at stock settings that it seems easier to make the sound worse than improve it!
Edited by MrMateoHead - 11/2/12 at 4:05pm