I forgot about that bug with the VST adapter... yes, you would usually have trouble loading Electri-Q presets with the VST adapter included in this thread.
1. On the one time that you manage to load the preset without crashing foobar, go to foobar's File->Preferences->Playback->DSP manager, and save a new DSP chain preset by typing a name in the text box and clicking Save. This would save a foobar preset with my new EQ for future use.
2. You may also consider switching to another VST wrapper that supports VSTs better: http://www.yohng.com/software/foobarvst.html This supports VSTs in foobar2000 in much more stable fashion, albeit only allowing one VST to load at a time.
I analyzed the output of DH2 and found it does indeed have slightly less reverb than DH1. Its frequency response is also well-nigh identical to that of DH1, but I made a separate EQ for it anyway:
https://www.dropbox.com/s/jtdytt6lqqm2t7j/Dolby%205.1ch%20headphone%20compensation-DH2.e-q?dl=0
About the use of the Digital Economy setting, I have found that it is actually the setting that elicits the highest fidelity from Electri-Q, as evidenced by a well-nigh perfect impulse response. A perfect impulse passing through Electri-Q in Digital Economy mode will come out still looking pretty much like a perfect impulse.
In
Out
(there is the slightest bit of LF rolloff causing a change to the waveform that is however not visible to the naked eye and certainly not audible. We're talking about 0.1dB of rolloff at 4Hz or so)
A perfect impulse passing through Electri-Q in Digital mode on the other hand will look like this:
@xnor speculated that this was the effect of an upsampling filter used to make the effects of high-frequency adjustments more precise. But I reckon that since Electri-Q shows the effects of the lack of the upsampling filter on the filter shape in Economy mode, I'd live with the minor inaccuracy (adjusting the curve manually if needed) and get the much better looking impulse response in return. It shouldn't be audibly different either way but still...