If you want superior battery life, over-ear comfort for long sessions, and a foldable design for travel, choose Sennheiser M4; if you need immersive spatial audio with head tracking, true wireless convenience for active use, and seamless connection to three devices simultaneously, choose Technics Reference Class Hi-Fi.
• Sennheiser M4: Delivers an exceptional 60-hour battery life and plush over-ear comfort, but its bulky form factor makes it impractical for intense physical activity or running.
• Technics Reference Class Hi-Fi: Offers cutting-edge Dolby Atmos with head tracking and a lightweight in-ear design perfect for movement, yet the shorter 10-hour per-charge runtime requires more frequent top-ups.
• The Verdict on Fit: The Sennheiser is the ideal choice for commuters, office workers, and audiophiles who prioritize sound isolation and endurance, while the Technics earbuds are the clear winner for athletes, gym-goers, and anyone needing a discreet, multipoint sports headset for exercise.
The Sennheiser Momentum 4 Wireless headphones are engineered for the listener who refuses to compromise on battery longevity or wearing comfort during extended listening sessions. With a massive 60-hour battery life, these over-ear headphones eliminate the anxiety of finding a power outlet mid-day. Whether you are on a cross-country flight, working through a marathon workweek, or simply enjoying a weekend of deep immersion into your favorite albums, the ability to play for up to 60 hours before needing a charge is a game-changer. The fast-charge feature further cements this utility; a mere 10-minute charge provides six hours of playback, making them incredibly resilient against forgetful mornings.
For those who value a secure, pressure-free fit, the design of the M4 stands out. The low-friction hinge mechanism allows for easy adjustment without pinching, while the cushioned headband and soft earpads ensure that even after hours of wear, there is no fatigue. The 42mm transducer system delivers what Sennheiser calls their signature sound, offering deep, immersive music with crystal-clear dynamics. This is particularly appealing to travelers and professionals who need to block out ambient noise completely. The Adaptive Noise Cancellation automatically adjusts to your environment, ensuring that whether you are on a noisy train or in a bustling coffee shop, your focus remains on the audio.
We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-10-28 · 7 min read · Independent comparison
However, the Sennheiser M4 is not designed for everyone. Its over-ear form factor and weight of 293 grams make it cumbersome for high-intensity activities. If your primary goal is to run, cycle, or hit the gym, these headphones will likely feel heavy and prone to slipping. They lack the sweat-resistant, lightweight profile required for a dedicated bluetooth headset for exercise. Furthermore, the 10-meter Bluetooth range, while standard for many premium headphones, might be limiting compared to the latest 5.3 connectivity found in some competitors, though it remains sufficient for most personal use cases within a home or office.
The Technics Reference Class Hi-Fi earbuds are built for the modern listener who demands the latest in spatial audio technology and absolute freedom of movement. These earbuds utilize advanced AI technologies to adapt sound to your environment, creating an unrivaled listening experience that feels tailored to the moment. The standout feature here is the Dolby Atmos integration with head tracking. As you turn your head, the soundstage shifts accordingly, placing instruments and voices precisely where they should be in space. This level of immersion is transformative for movie lovers and gamers, making it feel like you are inside the scene rather than just listening to a recording.
For the active user, the design philosophy of the Technics AZ100 is clearly prioritized around mobility. At 1.76 ounces total weight, they are significantly lighter than traditional over-ear options, featuring a lower-profile shape that fits ear contours better than bulkier predecessors. This improved fit ensures stability during movement, making them a strong candidate for those seeking multipoint sports earbuds for exercise. The ability to connect to three devices simultaneously via 3-point multipoint connection means you can seamlessly switch between your phone, laptop, and tablet without manual re-pairing. This is crucial for professionals who juggle multiple workflows or students managing different devices throughout the day.
The audio quality itself is driven by magnetic fluid drivers, which provide low distortion and accurate bass reproduction. This technology ensures smoother mid-to-high frequencies and a wide dynamic range, delivering the clarity expected from a "Reference Class" product. The adaptive noise-cancelling technology responds dynamically to your surroundings, while the Voice Focus AI chip ensures your voice comes through clearly during calls, even in windy or noisy environments. While the 10-hour battery life per charge (extending to 28 hours with the case) is less than the Sennheiser's 60 hours, it is still substantial enough for a full day of use, provided you remember to place them back in the case overnight.
• Best for Battery Life → Sennheiser M4: With 60 hours of continuous playback versus 10 hours, the M4 wins decisively for long-haul travel or days away from a charger.
• Best for Spatial Audio & Immersion → Technics Reference Class Hi-Fi: Only the Technics offers Dolby Atmos with head tracking, creating a 3D soundscape that the M4 cannot replicate.
• Best for Active Use & Exercise → Technics Reference Class Hi-Fi: The lightweight, in-ear design and secure fit make these the only viable option for running or intense workouts.
• Best for Multipoint Connectivity → Technics Reference Class Hi-Fi: Support for three simultaneous connections beats the single-device focus often seen in older models, ideal for multitaskers.
• Best for Call Clarity → Technics Reference Class Hi-Fi: The dedicated Voice Focus AI chip specifically targets voice isolation for clearer conversations in noisy settings.
• Best for Comfort During Long Sessions → Sennheiser M4: The padded, over-ear design with a low-friction hinge offers superior relief for all-day wear compared to in-ear tips.
• Best for Portability & Case Size → Technics Reference Class Hi-Fi: The compact charging case and wireless charging capability offer greater convenience for on-the-go lifestyles.
• Best for Audiophile Customization → Sennheiser M4: The integrated equalizer and Sound Personalization features allow for deeper tweaking of the 42mm driver output.
In my opinion, the decision ultimately hinges on how you plan to use these devices in your daily routine. If your priority is purely passive listening—commuting, working at a desk, or traveling—and you want the longest possible battery life without interruption, the Sennheiser M4 is the superior engineering marvel. However, for the specific use case of exercise and active mobility, the Technics Reference Class Hi-Fi is the undeniable winner. Its combination of Dolby Atmos, head tracking, and a stable, lightweight fit makes it the perfect bluetooth headset for exercise, offering a level of engagement and freedom that over-ear headphones simply cannot match. I would buy the Technics earbuds if I wanted to stay connected and immersed while moving, as they represent the future of active listening.
Yes, the Technics Reference Class Hi-Fi are designed with an improved fit and lightweight profile specifically for active use, making them suitable for running and gym sessions. The Sennheiser M4, being over-ear headphones, are generally too bulky and heavy for high-intensity exercise.
The Sennheiser M4 offers a significantly longer battery life of up to 60 hours on a single charge, whereas the Technics earbuds provide 10 hours of playback per charge, extending to 28 hours with the included charging case.
Yes, the Technics Reference Class Hi-Fi features 3-point multipoint connection, allowing you to pair with three devices simultaneously and switch between them effortlessly. The Sennheiser M4 focuses on single-device Bluetooth connectivity.
Both models feature adaptive noise cancellation, but the Sennheiser M4's over-ear design typically provides stronger physical isolation from external noise due to the seal created by the ear cups, which can be advantageous for very loud environments like airplanes or trains.
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