Philips Fidelio M1
I received the Philips Fidelio M1 today, and I am astounded at the sound. Whereas the L1 has a high fidelity treble response (despite a rather emphasized bass), the M1 has essentially no treble. I compared the M1 to the L1, and then I compared the M1 to the v-moda M-80 which has a recessed treble compared to all of my best headphones. The M1 sounds like its treble is 20 db down compared to the M80, and far worse compared to the L1 and Shure 1840, to name a couple of hi-fi headphones. I've seen a couple of frequency response curves on the M1 that suggest the treble isn't that bad, so perhaps this is a quality control issue? The drivers are perfectly matched in output and there's no indication that they're not working correctly.