I just got John's Cmoy Bass Boost clone today also, and it definetly is a major improvement over non-amped for my AKG K271. I seem to have a bit different layout, without the volume knob, enough room such that I can stick another 9v battery in series, which I'm going to attempt tomorrow. I bought it because of this thread specifically, thanks for sharing.
My first headphone amp, and it's hell of a bang for the buck, especially since the AKG K271 are power hungry, and a bit bass shy compared to others, my EQ on my Iriver H120 doesn't have enough oomph for my tastes, but this does the job perfect...
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