Cons: Would prefer more upper treble extension

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I have the H40 too.
I use Neutron Player with my portable DAP and sometimes I use the EQ (10 band graphic) to increase the upper treble extension and decrease the low frequencies a bit.
So the H40's original frequency curve modified and much closer to the Harman-Kardon curve.

Thanks for the review!

Thanks for the reply! I'm not all that into EQ'ing. I used to do it alot but part of the fun for me is finding the products that suit me as sold.