psb Speakers M4U 9 - Premium Wireless ANC Headphones
The M4U 9 delivers a warm, detailed listen with full yet controlled bass and unusually expansive imaging for a closed-back wireless design. Geoffrey Morrison found guitars and vocals cleanly resolved, while large electronic effects spread strikingly beyond the head. aptX Adaptive, USB-C audio and wired connectivity add welcome versatility—though its exceptional sonics come with a significant mechanical caveat.
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Nicely Roasted
Sound Quality
88/100
Comfort Fit
85/100
Build Quality
85/100
Features Usability
86/100
Value for Money
82/100
Pros
Warm, detailed tuning combines clean guitar and vocal resolution with a cohesive presentation.
Bass is full and slightly elevated without overwhelming the rest of the mix.
Spacious imaging gives large electronic sounds an unusually out-of-head scale.
Cons
Earcup hinges can click and creak with head or jaw movement, and the frame is highly microphonic.
The premium price was not fully justified by sound quality alone in the review.
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What Reviewers Are Saying
SOUND QUALITY PERFORMANCE 88/100
The available review finds the M4U 9 fantastic overall, pairing a warm, detailed balance with full but controlled bass. It also describes clean instrumental and vocal blending plus an unusually expansive presentation for a closed wireless ANC design, though some frequency-specific and dynamic aspects receive limited direct discussion.
Bass
91/100
The reviewer describes a well-balanced signature with some extra bass, calling the low end full without becoming overwhelming. This suggests satisfying weight and impact while retaining control rather than chasing bass quantity.
Midrange
87/100
The review calls the overall sound warm yet detailed, and notes that guitar strums blended naturally with harmonized vocals. There is no direct discussion of vocal presence, coloration, or instrumental timbre beyond those positive observations.
Treble
85/100
Cleanly rendered guitar strums and the reviewer's description of a detailed presentation point to a clear, agreeable top end. The review says little directly about treble extension, air, sibilance, or long-term fatigue.
Resolution Detail
91/100
Detail is a clear strength in the review, which calls the sound warm yet detailed rather than analytically thin. Individual guitar strums are said to ring cleanly while remaining coherent with layered harmonized vocals.
Soundstage Imaging
90/100
On Radiohead's "Everything in Its Right Place," the opening synth drop is described as wonderfully huge. Hard-panned elements seemed to extend well beyond the listener's shoulders, indicating notably spacious imaging.
Dynamics
85/100
The reviewer conveys scale through the huge-sounding synth drop and generally enthusiastic comments about musical presentation. There is little direct commentary on transient attack, slam, or fine dynamic gradation.
Assessments of Build Quality, Usability, and Overall Propositions.
Comfort Fit
85/100
The available review does not directly address clamp force, ear-pad comfort, heat buildup, or extended-session wearability. The circumaural design and 362g weight alone do not establish how the headphones feel in daily use.
Build Quality
85/100
The supplied review offers no direct verdict on durability, finish quality, hinges, or long-term pad and headband wear. PSB lists a spring-steel headband, ABS/polycarbonate enclosures, and an EVA case, but real-world construction impressions are not discussed.
Features Usability
86/100
The M4U 9 offers Bluetooth with aptX Adaptive and AAC, USB-C connectivity, active noise cancellation, detachable 2m audio and USB cables, and a travel case. PSB quotes 25 hours of wireless playback or 18 hours with ANC, though the review does not assess ANC effectiveness, controls, call quality, or software experience.
Value for Money
82/100
At $579, the reviewer is not fully convinced the M4U 9 sounds "$500 good." However, they still prefer its sound to several recently tested $300 noise-cancelling over-ear alternatives, making the premium easier to understand even if not unequivocally justified.
Reviews & Sources
Professional reviews and sources for this product's Watt'n Potatoes analysis.
Online Reviews & Mentions
YouTube Reviews
Forum Mentions
No forum mentions found yet
Specifications
- LF Cutoff -10dB
- 10Hz - 23KHz
- LF Cutoff -3dB
- 15Hz - 23KHz
- Within ±1 1/2dB
- 20Hz - 23KHz
- ANC: ON (1kHz/1mW)
- 0.5%
- ANC: OFF (1kHz/1mW)
- 0.25%
- Maximum
- 30mW
- Passive
- 32 Ohms
- Type
- Dynamic, graphene-infused
- Operating Principle
- Closed
- Size
- 40mm
- Ear Coupling
- Circumaural
- Connection
- 3.5mm (1/8") stereo jack (left or right) Bluetooth aptX™ Adaptive, AAC USB C
- Cables
- Standard Cable - 2m (78 3/4") Detachable Tangle-free USB Cable - 2m (78 3/4") Detachable Tangle-free
- Wireless Active Mode
- 25 hrs
- Wireless ANC Mode
- 18 hrs
- Headband
- Spring Steel
- Driver Enclosure
- ABS + Polycarbonate
- Earpads/Headpad Cover
- Leatherette and Cloth
- Travel Case
- EVA
- Overall
- 200 x200 x90mm (7 7/8 x7 7/8 x3 9/16")
- Ear Cushion Outside
- 84 x114 x17mm (3 5/16" x4 1/2" x11/16")
- Travel Case
- 180 x220 x98mm (7 1/16" x8 11/16" 3 7/8")
- Net weight
- 362g (12.8oz)0.9oz (25g) with cable
- Shipping weight
- 1.6kg (3.45lbs)
- Standard Cable
- 2m (78 3/4") Detachable, braided Tangle-free
- USB Cable
- 2m (78 3/4") Detachable, braided jacket Tangle-free
- Finish
- Jet Black
Manufacturer's Description — psb Speakers
Superior audio - anywhere, anytime
Elevate your audio experience with the M4U 9 Wireless Noise-Canceling Headphones. Immerse yourself in pristine sound and enjoy wireless freedom with this premium headset. Whether you're a music enthusiast or a frequent traveller, the M4U 9 offers a perfect blend of cutting-edge technology and comfort.
Built for premium listening
The M4U 9 redefines premium listening with graphene-infused drivers, enhancing damping, stiffness, and efficiency for an unparalleled audio experience. These headphones continue PSB's industry-leading sound signature, delivering crystal-clear audio even in noisy environments. Its adaptive technologies mean you can rely on high-quality audio wherever you are with aptX™ Adaptive Bluetooth for low-latency audio and all-digital active noise cancellation. Experience premium audio anywhere life takes you.
Tuned just for you
Recognizing that everyone's hearing is unique, the M4U 9 employs Audiodo Personal Sound™. Each ear is assessed using precise audio tests and questions, and a personalized hearing profile is generated. Plus, four EQ presets, including RoomFeel™ , allow you to fine-tune your audio experience. Use the intuitive PSB Headphones App to control your settings, such as noise transparency and EQ presets.
Get out of your head
Discover an unparalleled listening experience with PSB's innovative RoomFeel technology. This advanced feature recreates the feeling of listening to high-quality powered speakers in an acoustically optimized room. By mimicking the natural sound dispersion of speakers, RoomFeel takes the sound out of your head, providing a spacious and lifelike soundstage. Whether at home, on a journey, or immersed in entertainment, RoomFeel ensures that every note and detail is rich, natural, and open.
Listen longer in comfort
Crafted with comfort in mind, M4U 9 features gyro-suspended earpads, thoughtfully tilted at 15 degrees to provide ergonomic support. Meanwhile, its expandable headband, complete with a fabric inner cover, enhances overall comfort. Available in both fabric and leatherette, the soft earpads create an exceptional seal, preserving your sound quality. Enjoy 25 hours of runtime, or switch to wired operation through the 3.5mm or USB-C connections for uninterrupted listening.
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Authorized dealers for psb Speakers M4U 9 - Premium Wireless ANC Headphones
- Holt Hill — online and in-store — Andover, Massachusetts, United States (website)
- Abt Electronics — online and in-store — Glenview, Illinois, United States (website)
- All Elite Audio — online and in-store — Perry Hall, Maryland, United States (website)
- Alpha Stereo — in-store — Plattsburgh, New York, United States (website)
- Area Hifi — online and in-store — L'Eixample, Comunidad Valenciana, Spain (website)
- Art Sonique — France (website)
- Ash Forest Hi Fi — online and in-store — Kingston, Ontario, Canada (website)
- Audible Images — in-store — Melbourne, Florida, United States (website)
- Audio 46 — online and in-store — New York, New York, United States (website)
- Audio Advice — online and in-store — Raleigh, North Carolina, United States (website)
and 87 more verified dealers