PSB M4U TWM Wireless Earbud Headphone - Black

Planar Technology in a True Wireless Earbud

The PSB M4U TWM are true wireless earbuds built on a Hybrid Planar dual-driver design. In each earpiece, a high-frequency Magneto-Static driver works with a dynamic midrange and bass driver. They weigh 5 grams per earbud, and the smart charging case ships with them.

Bluetooth carries aptX Adaptive, AAC and SBC. Click buttons on both earbuds handle volume, track skips and calls, so you never reach for the phone. An IP65 rating covers sweat, water and dust.

A Hearing Test Built Into the App

The PSB Headphones App includes Audiodo Personal Sound. A short hearing assessment maps each ear on its own, then builds a compensation curve for the earbuds. You can switch it off with one tap and go back to the factory tuning.

Tuned Like a Good Speaker in a Good Room

PSB tunes every M4U headphone with RoomFeel. It draws on research into room gain, the warmth that room boundaries add to a speaker. The aim is an open, in-room sound that feels less locked inside your head.

The app adds Volume Dependent Compensation and four EQ presets. Digital Trends noted that RoomFeel is the default starting point, and that the other three presets build on top of it.

Numbers Behind the Design

Each driver is 6mm, in a sealed ear-coupled design. Frequency response is within 1.5dB from 20Hz to 20,000Hz. Playback lasts 8 hours per charge, with 24 more from the case. Charging takes 66 minutes for the earbuds and 2 hours for the case.

What Reviewers Are Saying

Simon Cohen, Digital Trends, March 11, 2024: "The M4U TWM deliver among clearest details I’ve ever heard from a set of wireless earbuds without sacrificing any low-end bass response."

Jesús González-Monreal, Audiophilia, October 1, 2024: "Perhaps this is the most natural listening experience I’ve had with Bluetooth earbuds." He also praised the physical buttons.

Who Are the M4U TWM Best For?

• You want detail from true wireless earbuds — a driver layout from full-size planar headphones fits in a pocket-size case
• You want sound matched to your own ears — the built-in hearing test sets each ear on its own, and one tap returns the factory tuning
• You exercise or commute — IP65 protection and 8 hours per charge, plus 24 from the case, cover a long day
• You prefer real buttons to touch panels — click buttons work with gloves on and confirm every press
• You want active noise cancelling — the M4U TWM block noise with a sealed fit and silicone tips. Noise-cancelling over-ear models from our headphones collection cover that need

How Do They Connect to Your System?

Open the case, pair over Bluetooth with your phone, tablet or computer, then install the PSB Headphones App for the hearing test and EQ. iPhones use AAC. Compatible Android phones can use aptX Adaptive.

Charge the case over USB-C or wirelessly. The case measures 64 x 36 x 32mm, small enough for a pocket. Pair once, tune once, go.

Pairs Well With

What rounds out a listening setup around the M4U TWM:

• Headphones — a full-size pair for the listening chair at home
• Headphone accessories — cases and spare tips for the earbuds
• Headphone stands — a place to keep your home pair in reach
• Earbuds — another pair for the gym bag or desk

Frequently Asked Questions

What comes in the box?

You get the earbuds, the smart charging case, three sizes of silicone tips and a USB-A to USB-C charging cable.

Do they work with iPhone and Android?

Yes. Bluetooth works with both. iPhones use AAC, and select Android phones can use aptX Adaptive for 24-bit playback.

How long does the battery last?

The earbuds play for 8 hours. The case holds three more charges, for about 24 more hours of listening.

How do I set up the personal sound?

Install the PSB Headphones App and run the hearing assessment. It builds a profile for each ear and you can save it or switch it off.

See It in Action

Tech Nuovo reviews the M4U TWM:

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Learn More

Want to learn more about true wireless earbuds, Bluetooth codecs, or getting a good in-ear fit? Visit our Learning Center for guides, tips, and expert advice.