Some brief observations, after a year with the PX and a month with the XM3:
- The PX sound nice and balanced after burn-in, and have a wonderfully detailed midrange; however, the mid-centric signature, wide soundstage, and soft treble produce a somewhat boxy, artificial presentation.
- After burn-in but without EQ, the XM3 is too bass heavy. With modest EQ (via the Sony app, if you’re using AAC), the XM3 sounds fantastic: it’s like they combine the detailed midrange of the PX but with the fun dynamics and extension of the P7W. EQ-ing down the bass also improves layering tremendously.
- ANC on the PX is somewhat effective, and sounds pretty good when set to Office. ANC on the XM3 is exceptional and does not noticeably affect the sound signature regardless of the intensity.
- The PX is disappointing when plugged in due to the amount of hiss introduced (especially with sources like a Dragonfly Red), and in my experience, the audio doesn’t sound much better anyway.
- The XM3 doesn’t exhibit any noise when an aux cable is connected, and audio quality does improve, but it’s still quite bass heavy and continues to benefit from source EQ.
- I don’t know how I ever got used to the PX earcups and headband—the XM3 is impossibly comfortable by comparison.
- I miss the auto-pause function of the PX. It worked 90% of the time for me and was quite convenient. The touch controls on the XM3 are good, and similarly work most of the time, but they aren’t as effortless as the PX.
I’m a longtime B&W fan as I appreciate their quality materials and house sound, but the flat/boxy presentation of the PX always bugged me to the point of overshadowing its technical ability. For that reason the P7W remains my favorite B&W headphone.
The XM3 is my first pair of Sony headphones, and although they’re too bass heavy out of the boxy, with some EQ they sound excellent. Combined with how comfortable and lightweight they are, I don’t find myself reaching for the PX anymore.