Hey; yes, I do 'shoot for this as an in room response' however I do it 'indirectly', I apply whatever EQ is necessary to get as flat a response as possible; then I also 'throw in' the 7 (or 8 since I usually need 2 filters for the 20 hz value

) parametric eq's to modify the sound from being what I consider (relatively) 'flat in a power sense' (flat db output for a constant input signal) to being 'flat in a perception sense', so if you hear a frequency sweep, the perceived volume (to your ear) should stay the same across the frequency band. There are factors affecting the accuracy
1) how 'flat' did you get the initial system (is the equalized response +- 10, 6, 3, 1 db?) without applying the "EarEQ" points?
2) is the equalized response flat *at the ear* or is it flat where the measurement microphone was?
3) is cabin gain taking over (the bass gets quite 'boomy' if you do not compensate for where the pressure mode takes over in the room...)
4)can the system in question even PLAY the lowest frequencies at an appreciable level (remember you need A LOT of headroom, even with the cabin gain (typically a highpass 12 db/oct filter @ 30-50 hz depending on the room) *so technically I do not have 38.9 db of gain @ 20 hz*, the highpass does need to be *before* the bass gain for headroom, but that would be the typical way of running things anyways...
5)are you going to be listening to the music at 80 phons (on average)? remember, the graph at the top is basically showing the equal intensity to equal loudness conversion; I chose 80 phons to be my reference since it is a pretty average listening volume. I have actually considered doing some sort of secondary eq chain which would be determined by a compressor (and base the compressors gate on the time it takes for the ear to respond to changes in loudness) so I could then figure out how much to add based upon what a 0 db signal is on the card however I just have not had the time...
Anyways; in my experience it does work great on speakers too along with headphones (remember, the sample I uploaded has a 12 db/oct filter @ 70 hz), like I mentioned before, this is basically trying to "EQ for the non-linearities of your hearing" once you get the non-linearities of the stereo (reproduction system) ironed out... Even if you do not EQ your speakers at all it appears to have a pretty big difference (like the "loudness button" on many old receivers).
As a less technical description: my Mom's aunt came to our house and was quite impressed by my stereo setup (it has improved since she saw it even

but relative to what the 'average person' has ... if you are on the forum you probably understand

...) Anyways, when she came into the room, she told me something to the effect of "oh I do not like *loud* music, so please don't turn things up loud; I have very sensitive ears"... I said "ok, but this is going to be much different than any stereo you have heard before because of the way I run it"... Long story short, we ended up turning things as loud as they would go and she thought it sounded great (at quiet and loud volumes). One thing she mentioned to me was that "it didn't sound harsh as you turned it up louder". So for lack of a better way to verbalize how something sounds; the EarEQ I made with the 7 parametrics listed above makes the sound "less harsh"...
EDIT: remember: if you are listening on headphones, there is no binaural processing; I typically use the B2SP (
http://bs2b.sourceforge.net/) plugin in foobar2000 in conjunction with a VST plugin running the parametric filters I use; along with a resampler to convert what is usually 44,100 samples/sec to 48,000 samples/sec so if you usually have some sort of processing enabled for your headphones, run it the exact same way as you always would. The bass (lower than 70 hz) may be a bit off on your system since I wanted to have the average signal be of decent volume relative to the original file and 70 hz is usually pretty good for headphones: remember though, this is a 20-20kHz eq, so there will be a big difference even if the bass is a bit off.
Addition: I mentioned (above) about converting the flat room to something that is flat to the ear so that a frequency sweep should sound flat; when I listen to music with the eq I do notice that bass lines, piano notes, and instruments do sound much more even (one note is equally as loud as another note, with bass (really deep 'rap' bass) for example, the bass line does not 'fade away' as the sound gets deeper (as I typically notice with rap music on an un-EarEQ'd system))
there is a song by Bent Fabric called "Relax Boy" that has a harp being 'strummed' (I think that is the correct term) starting at a high frequency and ending at a low one; with everything being eq'd it sounds much more even and you can "hear everything well" where normally there would be some parts that are harder to hear... It's sort of a different song but it may help you to hear what I am talking about... Or just download both files I posted (22 mb total) and listen to the original first and the processed one second; the processed one will require a bit more volume since the entire signal is a bit quieter due to headroom issues