Here's my review of the first (to my knowledge) 'real' headphone/IEM to use a Dirac DSP for both frequency response and impulse response correction. The Apple Earpods and earbuds were first, hence my use of 'real' above.
http://www.hifiheadphones.co.uk/forum/headphone-reviews/2238-t-jays-four-iem-jays-curves-dirac-dsp-app-review.html
http://www.hifiheadphones.co.uk/forum/headphone-reviews/2238-t-jays-four-iem-jays-curves-dirac-dsp-app-review.html