Sony ULT Wear WH-ULT900N Over-Ear

The Sony ULT Wear WH-ULT900N and the older WH-1000XM4 are both feature-rich over-ear headphones with Active Noise Cancelling, but they target slightly different priorities. The newer ULT Wear boasts significantly longer endurance, offering up to 50 hours of battery life compared to the XM4's 30 hours, and it supports a newer Bluetooth 5.2 standard. Conversely, the WH-1000XM4, released in 2020, features a higher maximum frequency range (40,000 Hz vs 20,000 Hz) and slightly lighter weight. Connectivity options also diverge, as the XM4 includes support for Lightning and USB-C wired connections alongside the standard 3.5mm jack, whereas the ULT Wear focuses primarily on 3.5mm. For users prioritizing marathon battery life and the latest wireless standard, the ULT Wear is the better choice, while the XM4 might appeal to those who value slightly better high-frequency detail and diverse wired options.