PSB M4U 9 Wireless ANC Headphones

PSB M4U 9 Wireless ANC Headphones at Vinyl Sound Buffalo NY

The PSB M4U 9 are over-ear wireless noise-canceling headphones built around 40mm graphene-infused dynamic drivers, delivering the acoustic detail and tonal accuracy of PSB's loudspeaker lineup in a closed-back circumaural headphone. Available at Vinyl Sound in Buffalo, New York, the M4U 9 combines all-digital active noise cancellation, Bluetooth aptX Adaptive and AAC, Audiodo Personal Sound personalized hearing profile technology, and PSB's proprietary RoomFeel EQ preset — a DSP mode that reproduces the spatial presentation of loudspeakers in an acoustically treated room. Battery life is 25 hours in wireless active mode and 18 hours with ANC engaged. Wired operation via 3.5mm or USB-C is available for uninterrupted listening when the battery is depleted. The gyro-suspended earpads are tilted 15 degrees for ergonomic fit over extended sessions, and the spring steel headband with fabric inner lining accommodates a wide range of head sizes. Available in Jet Black, with leatherette and cloth earpad options and an EVA travel case included. The M4U 9 is part of Vinyl Sound Buffalo's full headphone collection, which covers wireless, wired, and noise-canceling headphones from leading audio brands.

Graphene-Infused Drivers and Active Noise Cancellation

Graphene is a single-layer carbon lattice with a higher stiffness-to-mass ratio than aluminum, titanium, or conventional mylar — the three most common headphone diaphragm materials. When infused into the M4U 9's 40mm dynamic driver diaphragm, graphene increases cone rigidity and reduces resonance at high frequencies, allowing the driver to reproduce transients and fine detail with less breakup distortion than conventional polymer or metal diaphragms. PSB's all-digital active noise cancellation applies digital signal processing to microphone feedback and feed-forward noise sampling, eliminating broadband ambient noise across the frequency range where ANC is most relevant — aircraft cabin drone, commuter rail, and open-plan office noise. Total harmonic distortion at 1kHz/1mW measures 0.25% with ANC off and 0.5% with ANC engaged, placing the M4U 9 at the low end of THD measurements for wireless ANC headphones at its price point.

Audiodo Personal Sound, RoomFeel, and PSB Headphones App

Audiodo Personal Sound is an in-app hearing assessment that delivers a series of tones and calibration questions through the headphones, generates a personalized hearing profile specific to each ear, and applies a custom EQ correction to compensate for individual hearing variation. This is distinct from manufacturer-set EQ presets, which apply a fixed curve regardless of the listener's actual hearing response. Four EQ presets are available through the PSB Headphones App, including RoomFeel — PSB's proprietary DSP mode that mimics the natural sound dispersion characteristics of loudspeakers in an acoustically optimized listening room, producing a wider and more open soundstage presentation than conventional headphone playback. Noise transparency and EQ settings are controlled directly through the PSB Headphones App for iOS and Android.

Specifications

Frequently Asked Questions

What does graphene-infused mean in the PSB M4U 9 drivers?

Graphene is a one-atom-thick lattice of carbon atoms with an exceptionally high stiffness-to-mass ratio — stiffer than steel and lighter than aluminum. When infused into the M4U 9's 40mm dynamic driver diaphragm, graphene increases cone rigidity without adding significant mass. A stiffer, lighter diaphragm resists flex and resonance at high frequencies, which allows the driver to reproduce high-frequency transients and fine detail more accurately than a conventional polymer diaphragm that begins to flex at the upper end of the audio range. This is the same engineering principle applied in PSB's Synchrony series loudspeaker tweeters, translated to headphone driver design.

What is Audiodo Personal Sound in the PSB M4U 9?

Audiodo Personal Sound is a hearing profile system built into the PSB Headphones App. When activated, it plays a calibration sequence of tones and frequency sweeps through the headphones and asks a series of perceptual questions. The app analyzes the responses for each ear independently and generates a custom EQ correction profile that compensates for that listener's individual hearing variations. Because hearing sensitivity is not uniform across people or across frequencies, a personal profile produces more accurate tonal balance than a fixed factory EQ curve applied identically to all listeners. The profile is stored in the app and applied whenever the M4U 9 is connected.

What is RoomFeel technology?

RoomFeel is a proprietary PSB DSP preset that applies a frequency and spatial processing curve designed to replicate how a loudspeaker in an acoustically treated room sounds — specifically the way room reflections, speaker dispersion, and low-frequency room support combine to produce a natural, open soundstage. Standard headphone playback places the acoustic image inside the listener's head, which sounds unnatural compared to loudspeaker listening. RoomFeel's DSP corrects for this by adding controlled early reflections and frequency shaping that shift the perceived acoustic image outward, producing a presentation that is closer to seated loudspeaker listening. RoomFeel is one of four EQ presets available in the PSB Headphones App.

What Bluetooth codecs does the PSB M4U 9 support?

The M4U 9 supports Bluetooth aptX Adaptive and AAC. aptX Adaptive is a scalable codec developed by Qualcomm that adjusts bit rate from 279kbps to 420kbps depending on connection quality, and supports low-latency modes for video synchronization. It provides higher audio quality than standard SBC, aptX, or aptX HD at typical listening distances. AAC is the preferred codec for Apple devices including iPhone, iPad, and Mac, and provides better audio quality than SBC on those platforms. For sources that support neither aptX Adaptive nor AAC, the connection falls back to standard SBC.

How long does the PSB M4U 9 battery last?

The M4U 9 delivers 25 hours of battery life in wireless active mode without ANC engaged, and 18 hours with active noise cancellation running. When the battery is depleted, the headphones can operate in passive wired mode via the included 3.5mm detachable cable without any amplification, or in active wired mode via USB-C for full DSP, EQ presets, and ANC functionality while charging simultaneously.

Can I use the PSB M4U 9 wired?

Yes. The M4U 9 includes two wired connection options. The included 2-meter detachable braided 3.5mm cable allows passive wired listening — signal passes through the drivers without any amplification or DSP processing, compatible with any device with a 3.5mm headphone output including older smartphones, portable audio players, and aircraft seat audio jacks. The included 2-meter detachable braided USB-C cable provides active wired operation with full DSP, EQ presets, ANC, and simultaneous charging from a USB-C source such as a laptop or power bank. Both cables are detachable and tangle-free.

Where to buy PSB M4U 9 headphones in Buffalo NY?

The PSB M4U 9 is available from Vinyl Sound, an authorized PSB Speakers dealer in Buffalo, New York. Vinyl Sound carries PSB's full speaker and headphone range, with in-store demonstrations available by appointment and free shipping across the continental United States. Contact Vinyl Sound Buffalo by phone or email to purchase the M4U 9 or compare it with other PSB headphone models.