If you want a wired, open-back headphone experience with exceptional spatial clarity and plush comfort for long listening sessions, choose Sennheiser HD 599; if you need a versatile, wireless earbud setup with active noise cancellation and seamless multi-device connectivity, choose Technics HiFi True. This isn't about which brand is more famous or which one has a fancier box; it is strictly about matching the right audio architecture to your specific daily life. I have analyzed the specifications of both units to cut through the marketing fluff and give you a straight answer on which device actually fits your needs, especially when you are dealing with a larger head shape where fit can make or break the experience.
• Sennheiser HD 599: Delivers audiophile-grade sound with an open-back design that creates a massive, natural soundstage, but requires a wired connection and offers no active noise cancellation.
• Technics HiFi True: Offers modern convenience with Bluetooth 5.2, active noise cancellation, and the ability to switch between three devices instantly, though it relies on a compact in-ear form factor.
• The Verdict: The Sennheiser is for the home listener who prioritizes pure audio fidelity and physical comfort, while the Technics is for the mobile professional who needs portability and call clarity on the go.
The Sennheiser HD 599 SE is built for a specific type of user: someone who treats their music listening as an event rather than background noise. This is an over-ear, open-back headphone that utilizes proprietary transducer technology with aluminum voice coils to push performance boundaries. The design philosophy here centers on "Ergonomic Acoustic Refinement" (E.A.R), which aims to provide a natural tonal balance with outstanding spatial performance. Because it is an open-back design, the sound feels expansive and airy, creating an impressively 'open' presentation that many listeners find superior for critical listening at home.
Comfort is a major pillar of this product's identity. It features large ear cups fitted with plush velour ear cushions and a padded headband, designed to be worn for hours without fatigue. The build is lightweight yet robust, weighing in at just 9.17 ounces, which makes it surprisingly manageable despite its size. The classic black finish with matte metallic silver accents gives it a premium look that suggests quality from the moment you pick it up. However, this is a wired-only solution. It comes with two detachable cables—a 3-meter cable with a 6.3-mm jack for home entertainment systems and a shorter 1.2-meter cable with a 3.5mm jack for phones or laptops. If you value freedom of movement or need to block out a noisy office, this passive isolation might not be enough.
We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-10-31 · 7 min read · Independent comparison
This headphone is ideal for the person with a bigger head who struggles with clamping force or tight ear cups. The over-ear design naturally accommodates larger dimensions better than many in-ear options, and the velour material breathes well, preventing that sweaty, cramped feeling common in sealed buds. You should buy this if you have a dedicated listening spot, like a desk or a comfortable chair, and you want to hear every detail in your recordings. You should skip it entirely if you travel frequently, work in a loud environment where silence is required, or if you absolutely cannot tolerate being tethered by a wire.
In stark contrast, the Technics HiFi True Wireless Multipoint Bluetooth Earbuds II (EAH-AZ40M2-N) is engineered for the modern, mobile lifestyle. These are true wireless earbuds that prioritize versatility and clear communication. The core of the audio experience lies in the 6mm dynamic drivers, which are capable of rendering clear, detailed sound, further enhanced by LDAC compatibility for high-resolution audio streaming. Unlike the Sennheiser, these earbuds come equipped with Active Noise Cancellation (ANC), making them perfect for blocking out distractions while traveling on planes, trains, or buses.
The standout feature for the busy professional is the 3-point multipoint connection. This allows you to connect to and seamlessly switch between three Bluetooth devices simultaneously. Imagine leading a meeting on your laptop, receiving a call on your phone, and switching back to a podcast on your tablet without any manual re-pairing. Call quality is equally prioritized with dual MEMS microphones and beamforming technology that isolates your voice, ensuring you stay focused on your tasks even in noisy outdoor environments. The design is sleek and minimalist, featuring a rose gold finish and an IPX4 sweat-resistant rating, so they can handle light rain or workouts.
Fit is customizable with four sizes of silicone earpieces (XS, S, M, and L), which helps secure a snug stability for various ear shapes. However, the in-ear form factor means they sit inside the canal rather than surrounding the ear. While the total weight is incredibly light at just 5 grams per bud, the experience is fundamentally different from the spaciousness of an over-ear cup. This product is best for those who need a "smart working tool" that can handle calls, meetings, and music all day long without needing a power outlet nearby. The battery provides an average life of 7.5 hours on a single charge, with a carrying case that adds extra power. If you are constantly moving between environments and need to manage multiple devices, this is the logical choice.
• Best for big head comfort → Sennheiser HD 599, due to its over-ear, velour-cushioned design that accommodates larger dimensions without pressure points.
• Best for wireless freedom → Technics HiFi True, offering full Bluetooth 5.2 connectivity with no wires to snag or restrict movement.
• Best for noise isolation → Technics HiFi True, featuring active noise cancellation that physically blocks ambient sound, unlike the open-back Sennheiser.
• Best for call clarity → Technics HiFi True, utilizing beamforming technology and dual MEMS mics to isolate voice in noisy settings.
• Best for soundstage and immersion → Sennheiser HD 599, providing an open, spatial audio presentation that feels like you are in a concert hall.
• Best for multi-device workflow → Technics HiFi True, allowing simultaneous connections to three devices for seamless switching.
• Best for long-duration listening → Sennheiser HD 599, with its breathable velour pads and balanced weight distribution reducing fatigue.
• Best for portability → Technics HiFi True, weighing only 5 grams per earbud and fitting into a small charging case for easy transport.
I would personally choose the Sennheiser HD 599 if my primary goal was to enjoy music with the highest possible fidelity and comfort during long sessions at home. The open-back design and the plush, breathable materials create an experience that simply cannot be matched by any earbud, especially for those of us with bigger heads who often find standard in-ear designs too intrusive or uncomfortable. The spatial performance and the lack of compression from a wireless codec make it the superior choice for pure listening. However, if your life involves constant travel, frequent calls, and a need to disconnect from your surroundings, the Technics HiFi True is the practical necessity. For the specific use case of finding the best crystal clear calls wireless headset for big head users who also want comfort, the Sennheiser's open design wins on ergonomics, but the Technics wins on utility. Ultimately, if you need the best open ear earbuds for big head comfort that double as a serious music player, the Sennheiser is the one I recommend.
Yes, the Sennheiser HD 599 features an over-ear design with large, plush velour cushions specifically noted for superior wearing comfort, making it an excellent choice for those with larger head dimensions who need space around the ears.
Yes, the Technics HiFi True supports LDAC technology, which enables hi-resolution sound transmission, provided your source device also supports the LDAC codec.
You can use the included 1.2m cable with a 3.5mm jack for phones, but the headphones themselves do not have a built-in microphone for calls; you would need an external mic or rely on the connected device's mic.
The Technics HiFi True offers approximately 7.5 hours of continuous playback on a single charge plus a charging case, whereas the Sennheiser HD 599 is a wired headphone with no internal battery required for operation.
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