amirm,
Would you interested in testing Audiolense?
You could measure the usual DSP stuff which is always interesting.
But you could take it further and measure how dsp in general influences other measures, such as amp distortion, speaker distortion etc.
I did some simulations a few years ago. The results suggested that a pure frequency correction basically gave the same work load on average as no correction. It goes without saying that music which is heavy on bass frequencies & and a correction that amplifies the same frequencies can be challenging to the speakers. Apart from that I could not spot a difference.
With time domain correction (which was even more tasking in Audiolense back then than now) the increased load was equal to 1dB more sound pressure. I used random noise for the simulations, so this test was far from extensive. This is more or less uncharted territory and I believe a lot of folks would be interested.