Been giving a ton of ear time to the Sony WF-1000XM4s these past few days and I’m more or less convinced that I won’t have to buy anything else for a while.
Sony’s claim that these IEMs will last for 8 hours of battery life on a charge with ANC on is legit. Connection stability has been rock solid with zero disconnects or dropouts. The buds themselves feel well made. and are light and small enough that having them in my ear doesn’t feel any different from having a bog standard IEM in my ear, except sans cables.
Now, as for my sound impressions. I’ll be upfront and tell you that these aren’t really going to satisfy you if you’re looking for treble energy. That means cymbals are just kind of “there”. They sound fairly closed in and don’t really give much in the way of air or perceived soundstage. Yes, you can use the EQ, but then you just made the XM4s sound a tad more shrill than they did before, so if that’s a dealbreaker then that’s a dealbreaker.
The XM4s weren’t made to do brilliance and splash. They were made to provide what is, to my ears, an amazing bass response and warm, engaging, mids, with the highs as more complementary and “in the background” rather than a point of focus. The degree of bass energy and visceral, thumping sensation that the XM4s provide surpasses anything I’ve heard before (even the Arias), be it wired or wireless. Despite this, the XM4s somehow avoid sounding bloated or muddy; in fact, they are resolving enough that you can tell when you’re listening to a lossless Red Book file versus a YouTube rip. Neither male nor female vocals suffer from recession; instead, they are very much front-and-center and details like the vocalist taking a breath are actually audible.
Of course, the elephant in the room, assuming you haven’t been turned off by the treble, and aren’t just completely closed to the idea of Bluetooth audio, is the price. These aren’t cheap, but you’d never know it by the slightly flimsy charging case lid and the barebones, recycled-paper package that you get that is comparable to KZ’s bargain basement offerings. I wouldn’t call these a value for money purchase, but as someone who enjoys the Sony house sound, needs a solution for commuting and work that has ANC and is as unobtrusive as possible, and wants it to just work (tm), I have few regrets.