PSB M4U TWM True Wireless Earphones

PSB M4U TWM True Wireless Planar Earphones at Vinyl Sound Buffalo NY

The PSB M4U TWM are true wireless in-ear earphones built around a hybrid dual-driver design combining a Magneto-Static planar driver for high frequencies and a dynamic planar driver for midrange and bass — a driver architecture previously found only in full-size audiophile earphones, miniaturized here to a 6mm form factor. Available at Vinyl Sound in Buffalo, New York, the TWM delivers 20Hz to 20kHz (±1.5dB) frequency response, Bluetooth aptX Adaptive with low-latency modes, Audiodo Personal Sound personalized hearing calibration, and PSB's RoomFeel DSP preset, all in an IP65-rated sealed earphone weighing 5g per earbud. Battery life is 8 hours from the earbuds with 3 additional charge cycles stored in the smart charging case for 32 hours total runtime. The case supports both USB-C wired and wireless charging. cVc (Clear Voice Capture) microphone technology reduces ambient noise during phone calls and voice calls in outdoor and noisy environments. Silicone ear tips are included in three sizes for passive noise isolation and secure fit. The TWM is part of Vinyl Sound Buffalo's full headphone collection, which covers true wireless, wireless over-ear, and wired headphones from leading audio brands.

Magneto-Static Hybrid Dual-Driver Design

Magneto-Static transducers — also called planar magnetic drivers — work by distributing a conductive voice circuit across an extremely thin, flat diaphragm suspended between two magnet arrays. Unlike a conventional dynamic driver's pistonic voice coil that pushes and pulls from a single point at the diaphragm's center, a planar driver applies driving force across the entire diaphragm surface simultaneously. This reduces the partial-mode resonances and cone flexure that cause harmonic and intermodulation distortion in conventional dynamic drivers at high frequencies, producing a more linear, lower-distortion response through the high-frequency range. In the TWM, the Magneto-Static driver handles high-frequency reproduction while a dynamic planar driver handles midrange and bass, allowing each driver to operate within its optimal excursion and frequency range. The result is a hybrid driver system that delivers the detail and transient precision characteristic of planar magnetic technology at a 6mm in-ear form factor.

aptX Adaptive, IP65 Rating, and Smart Charging Case

The TWM's Bluetooth aptX Adaptive codec scales transmission bit rate from 279kbps to 420kbps based on wireless connection quality and includes a low-latency mode for video and gaming synchronization. This places the TWM in the same wireless quality tier as the M4U 9 flagship headphones and above the aptX HD used in the M4U 8 MKII. The IP65 rating certifies full dust ingress protection (IP6X) and protection against directed water jets from any angle (IPX5), covering sweat, rain, and gym use without risk to the earphone electronics. The smart charging case holds 3 additional charge cycles for 24 hours of backup power, recharges via USB-C wired or wireless (Qi) charging, and fully recharges in 2 hours. The earbuds charge in 66 minutes from the case's internal battery. Controls on each earbud include click buttons for volume adjustment, track skipping, and call management.

Specifications

Frequently Asked Questions

What is a Magneto-Static driver and how is it different from a dynamic driver?

A Magneto-Static driver — also called a planar magnetic driver — uses a thin flat diaphragm with a printed conductive circuit distributed across its entire surface, suspended between two magnet arrays. When an audio signal passes through the circuit, the magnetic force acts uniformly across the whole diaphragm at once rather than pushing from a single point like a dynamic driver's voice coil. This distributed-force design eliminates the partial breakup resonances and cone flex distortion that occur in dynamic drivers when the diaphragm's center is driven faster than its edges can follow. Planar drivers are known for lower distortion, faster transient response, and more even high-frequency dispersion than equivalent dynamic drivers — characteristics that were previously only achievable in large full-size planar headphones. The TWM miniaturizes this to a 6mm in-ear form factor.

What is the hybrid dual-driver design in the PSB M4U TWM?

The TWM uses two different driver types for different parts of the frequency spectrum. The Magneto-Static planar driver handles high-frequency reproduction, where its distributed-force diaphragm provides detail, resolution, and low distortion at low listening volumes. The dynamic planar driver handles midrange and bass, where its greater excursion capability delivers the output level and low-frequency extension required for impactful bass and natural vocal reproduction. Each driver operates within the frequency range where its design performs best, with a crossover between them inside the earphone enclosure. This hybrid architecture is common in high-performance in-ear monitors used by recording engineers and professional musicians.

What is aptX Adaptive Bluetooth and why does it matter for earphones?

aptX Adaptive is a Qualcomm Bluetooth codec that dynamically adjusts transmission bit rate between 279kbps and 420kbps based on the wireless connection quality between the source and earphone. On stable connections, it maintains higher bit rates for audio quality; on congested or long-distance connections, it scales down to maintain reliability. It also includes a dedicated low-latency mode that reduces transmission delay for video and gaming synchronization. This makes aptX Adaptive more versatile than fixed-rate codecs like aptX HD (which cannot adjust bit rate) or standard SBC (which caps at lower quality). For sources that don't support aptX Adaptive, the TWM falls back to AAC or SBC.

Is the PSB M4U TWM waterproof and suitable for workouts?

Yes. The M4U TWM carries an IP65 rating. The "6" in IP65 indicates complete protection against dust ingress. The "5" indicates protection against water jets directed from any angle — covering sweat, rain exposure, and water splashing from gym equipment or outdoor activities. IP65 is suitable for running, cycling, gym training, and commuting in light rain. The earphones are not rated for submersion in water, so they should not be worn swimming or in direct contact with running water at close range. The silicone ear tips in three sizes provide a secure, sealed fit that maintains the earphone position during physical activity.

How long does the PSB M4U TWM battery last?

The earbuds deliver 8 hours of music playback per charge. The smart charging case stores 3 additional full charge cycles, providing 24 hours of backup power — for a total of 32 hours of listening before the case itself needs recharging. The earbuds charge fully in 66 minutes from the case. The case recharges in 2 hours from a USB-C wired connection or via wireless (Qi) charging. Battery status for both earbuds and the charging case can be monitored in the PSB Headphones App.

What does the smart charging case do for the PSB M4U TWM?

The TWM's charging case stores and charges the earbuds when not in use and carries an internal battery providing 3 additional full charge cycles — 24 hours of backup power in a compact 64 × 36 × 32mm case. The case accepts charge via USB-C wired connection or wireless Qi charging, making it compatible with smartphone wireless chargers without carrying a separate cable. The earbuds seat magnetically in the case and begin charging automatically on contact. The case also manages Bluetooth pairing state, resetting the earbuds to pairing mode when the case lid is opened with new devices.

Where to buy PSB M4U TWM earphones in Buffalo NY?

The PSB M4U TWM is available from Vinyl Sound, an authorized PSB Speakers dealer in Buffalo, New York. Vinyl Sound also carries the PSB M4U 9 and M4U 8 MKII wireless over-ear headphones for listeners who prefer a full-size form factor. Free shipping is available across the continental United States. Contact Vinyl Sound Buffalo by phone or email to purchase or for product comparison assistance.