Bowers & Wilkins PI3 vs Sennheiser MM 400-X – Specs, Price & Comparison (2026)

A measured feel. Hear and be heard. World-first fully active 2-way wireless earbuds. This is Bowers & Wilkins Dual Driver technology. No matter what youâ€™re listening to, or watching, or playing, hear what you were meant to hear. If you stay out longer than expected and need a little more from your PI3 a 15 minute quick charge will carry your adventure for another two hours.

- CD quality audio â€“Featuring the apt-XÂ® codec, the headsets can connect wirelessly to any BluetoothÂ® apt-XÂ® enabled devices, such as the new Apple computers and selected Creative and Samsung music products - Wireless freedom â€“ BluetoothÂ® 2.1 guarantees hands-free convenience without wires and the advanced A2DP profile for Stereo BluetoothÂ® delivers optimized hi-fi stereo sound - Invisible microphone â€“ with high-performance sound quality for clear conversations - Direct cable option â€“ for use on airplanes, with an airline adapter included - Easy headset controls â€“ in one intuitive cluster - Sennheiser sound quality â€“ hi-fi headphone drivers ensure superior dynamic range, detail and excellent bass - Wearing comfort â€“ padded ear-cushions provide an excellent soft fit, even on long trips - Easy-2-GO â€“ the headset folds into a compact bundle for travel and storage, while the headband is metal-reinforced for durability - Flexible â€“ replace the battery with a s

Key Differences

There is a noticeable difference in weight (105 g vs 31 gm), which may affect comfort during extended use. The driver size differs between the two (NA vs 9.2 mm), which can influence sound depth, bass response, and overall audio clarity. Battery life varies between the two (10 Hrs music, 20 Hrs talktime vs 8 Hours), which affects how long you can use them on a single charge. The frequency response differs (15 Hz - 22000 Hz vs 10 Hz - 30000 kHz), which can influence how well the headphones reproduce lows, mids, and highs. Sennheiser MM 400-X and Bowers & Wilkins PI3 offer different noise cancellation capabilities (NA vs Active), which can impact how effectively they block external noise. In general, both options are suitable for everyday use including music, calls, travel, and work-from-home scenarios. Impedance levels vary (32 Ohms vs 32 ohm), which can affect compatibility and audio output when used with different devices. Sennheiser MM 400-X and Bowers & Wilkins PI3 are premium wireless headphones designed to deliver high-quality sound along with advanced features like noise cancellation and long battery life. Sennheiser MM 400-X uses Bluetooth BluetoothÂ® Version while Bowers & Wilkins PI3 supports Bluetooth 5.0, which can impact connectivity stability and efficiency.

Verdict: Both models are competitive, and your decision should be based on your usage needs and preferred features.

Top Differences

Battery Life: 10 Hrs music, 20 Hrs talktime vs 8 Hours
Noise Cancelling: NA vs Active
Driver Size: NA vs 9.2 mm
Bluetooth: BluetoothÂ® Version vs 5.0
Weight: 105 g vs 31 gm

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Key Differences

Top Differences