Sony WH-1000XM6 vs Sennheiser Momentum 4: Which Headphones?

These two premium wireless headphones sit at opposite ends of a similar ambition. Sony's WH-1000XM6 is the 2025 flagship, refining the class benchmark and priced to match; Sennheiser's Momentum 4 Wireless has been the pragmatic value champion since 2022, trading its forebears' leather-and-metal luxury for technology and a lower price. Both offer active noise cancelling, multipoint and long battery life, but they make very different trade-offs. This comparison draws on the complete published tests of both models; Truthful Reviews has not bench-tested either pair itself.

Design and Comfort

The XM6 keeps Sony's familiar slim-armed look but corrects the previous generation's biggest flaws: it returns to a folding design with reinforced stainless-steel hinges, feels more secure on the head even during brisk walking, and at 250 g remains one of the lightest premium headphones going. The finish is a little light for the money — mostly ordinary plastic that shows fingerprints — and the headband, though deeper, is less padded than before. The Momentum 4 made the opposite journey, shedding the Momentum line's steel and leather for good-quality plastic; the name appears only inside the left cushion. It does not fold but its cups rotate flat into a rigid case, and at 290 g it is heavier than the Sony yet judged comfortable and well-balanced, better than average for long sessions. Both lean on rubberised synthetic-leather pads that trap some heat.

Sound Quality

Both are technically excellent and closely matched, with the difference being one of character. The XM6 carries 30 mm carbon-fibre dome drivers and a tuning reworked by renowned sound engineers, and the published test praised its precise, natural midrange — a deliberate lift around 1.5 kHz for body and clarity, natural highs without excessive brilliance, and faithful timbres — while noting its bass runs a little too generous, favouring the sub, and that its soundstage is not the widest. The Momentum 4 uses a 42 mm dynamic driver and delivers a warm, round, polyvalent sound: strongly marked bass that stops short of the deepest frequencies, recessed and even highs with none of the sharp treble peak of its rivals, and a composure that handles difficult, aggressive material better than the Sony. The verdict on the Sennheiser was that it aligns with the recent Sony technically at a meaningful saving; the XM6 is the more refined and detailed listen, the Momentum 4 the warmer, more forgiving one. Both sound poor in passive wired mode.

Noise Cancelling

This is the Sony's decisive win. The XM6 moves to a QN3 processor described as seven times faster than the XM5's, paired with twelve microphones against the older model's eight, and was judged to have the most versatile noise cancelling on the market: best-in-class in the deep bass, strong up to 400 Hz, reaching around 35 dB at 250 Hz, flattening urban rumble, wind and nearby engines into a genuine bubble of silence. The Momentum 4 is a very good 2022-class performer — uniform, with well-attenuated bass — but its own test placed it behind even the XM5, particularly on voices around 500 Hz to 1 kHz, where it manages 15-20 dB against the Sony's 25-30 dB, and it is more sensitive to fit. Against the newer XM6 the gap is wider still. For silence, the Sony is comfortably ahead.

Calls and Transparency

Here the Sennheiser strikes back. Its microphones were rated among the rare few usable in all conditions: intelligible even on a busy street, with noise reduction dosed so it neither intrudes nor swallows the voice, bar a little wind saturation. The XM6 improves on its predecessor with six external call microphones and is now intelligible in noise, but the published test found the voice veiled with persistent artefacts, leaving it below the competition. On transparency the roles reverse: the XM6's mode is much improved and lets you follow a conversation naturally, near the level of an AirPods Max, while the Momentum 4's is only correct, over-isolating above the upper mids.

Connectivity

The two pick different ecosystems. The XM6 carries Sony's LDAC alongside SBC and AAC, and adds LE Audio with the LC3 codec and Auracast reception — a first for a Sony headphone — though multipoint still needs an awkward power-cycle to re-pair, and, surprisingly, there is no audio over USB-C. The Momentum 4 forgoes LDAC for AptX Adaptive (and AptX/AptX HD), a pragmatic choice that keeps multipoint always available with rock-solid stability and excellent range, and it does allow combined audio-and-charging over USB on a computer. Both include a 3.5 mm analogue input, though the Sennheiser repeats its awkward 2.5 mm headphone-side socket.

Battery Life

The Momentum 4's headline number is extraordinary. Where the previous Sennheiser managed around 17 hours, the Momentum 4 was measured between roughly 58 and 63 hours with cancelling on — a near-quadrupling, and far beyond the field. The XM6 is merely good by comparison: rated at 30 hours with cancelling and measured at about 36 h on, 47 h off, itself an improvement on the XM5 but less than half the Sennheiser. If time between charges is what matters, nothing here touches the Momentum 4.

Which Should You Buy?

Choose the Sony WH-1000XM6 if you want the best of the class and will pay for it: the most versatile noise cancelling on the market, a precise and refined sound, LE Audio and a foldable, secure premium build — accepting merely good battery life, a finish that feels light for the price, call microphones that still trail the best, and no USB-C audio. Choose the Sennheiser Momentum 4 Wireless if value and stamina lead: an extraordinary ~60-hour battery, class-leading call quality, a warm forgiving sound that aligns technically with the Sony, and AptX connectivity — all at a significant saving, accepting noise cancelling a clear step behind and a less natural transparency mode. The Sony is the flagship for silence and refinement; the Sennheiser the smarter buy for battery, calls and the money.