Does anyone know of a Harman kardon sound mod for the M9 ?

Does anyone know of a way to add the Harman kardon sound mod to a Verizon M9 ? As far as I am concerned the stock M9 Dolby just sucks compared to the Harman kardon sound I had on my M8. And I know its not a problem with my M9 as I have had my hands on near a dozen of them and the sound on all sucked compared to the Harman Kardon on the M8. I have even tried viper4android which is a nice mod but with it I still think the Harman kardon was a lot better. Also the M8 with Harman kardon was a lot louder with the built in boom speakers. Just would be nice to have that mod. Does anyone know anything on this ? Is it just not compatable or just does no one have any interest in doing this mod ?