If you want long battery life, seamless multipoint connectivity, and a lightweight on-ear design for library study sessions, choose Sony WH-CH520L; if you need customizable retro aesthetics, interchangeable ear pads, and distinct EQ modes to tailor your sound, choose We Are Rewind EQ-001.
• Sony WH-CH520L: The standout strength is its massive 50-hour battery life and Bluetooth multipoint connection, while the trade-off is the lack of active noise cancellation and an on-ear fit that some may find less isolating than over-ear models. This pick is for the serious student or commuter who needs headphones to last all day without charging.
• We Are Rewind EQ-001: Its biggest advantage is the unique retro styling with three interchangeable ear cushion colors and dedicated EQ modes, but it sacrifices battery longevity with only 12 hours of playback and lacks advanced connectivity features like multipoint pairing. This choice fits the listener who prioritizes personal style and specific sound profiles over endurance.
The Sony WH-CH520L is built for people who treat their headphones as essential tools for focus and endurance. In a library setting, where silence and concentration are paramount, this model offers a practical solution that prioritizes uninterrupted listening. With a battery life that stretches up to 50 hours on a single charge, you can go weeks between charges during typical use, making it ideal for students or remote workers who might forget to plug in every night. If you do run low, the quick charge feature is a lifesaver; just ten minutes of charging provides roughly 90 minutes of playback, ensuring you aren't stuck waiting for a full cycle before getting back to your work.
Comfort is another major pillar for this headphone, especially for those wearing headband headphones for library sessions that last several hours. The manufacturer specifies a lightweight design weighing only 310 grams, paired with soft ear pads and an adjustable headband. While these are on-ear headphones rather than over-ear, the rounded earpiece shape and polyurethane materials are designed to reduce pressure points. However, potential buyers should note that they rely on sound isolation rather than active noise cancellation. If your library environment has sudden bursts of noise or if you prefer to be completely isolated from the world, this passive isolation might not be enough, but for general ambient noise reduction, it performs well.
We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-10-29 · 7 min read · Independent comparison
Connectivity is where this unit truly shines for the multitasker. The inclusion of Bluetooth multipoint connection allows you to pair two devices simultaneously, such as a laptop and a phone. You can listen to music from one device and seamlessly switch to a call on the other without unpairing. This is crucial for anyone managing multiple streams of information. The Digital Sound Enhancement Engine (DSEE) also helps by restoring high-frequency details in compressed audio files, which is helpful if you stream music or podcasts frequently. For someone looking for a reliable, no-fuss companion that stays charged and connected, the Sony WH-CH520L is a robust contender.
The We Are Rewind EQ-001 caters to a very different buyer: someone who views headphones as a fashion statement and a personalized audio experience. The defining feature here is the ability to swap out the ear cushions. You get three distinct colors—orange, yellow, and black—allowing you to match the headphones to your mood, outfit, or the decor of your room. This level of customization is rare in the budget-friendly wireless market and makes the EQ-001 stand out visually. For a student who wants their tech to reflect their personality, having the option to change the look of the headphones is a significant draw.
Audio control is another area where this model carves out its niche. Instead of relying solely on a generic app, the EQ-001 comes with three physical equalizer modes: Signature, Balanced, and Bass Boost. This means you can instantly switch the sound signature depending on whether you are listening to classical music, podcasts, or heavy bass tracks. While the frequency range covers the standard 20 Hz to 20,000 Hz, the ability to manually boost the bass or balance the treble gives you more immediate control over the listening experience. The built-in digital MEMS microphone ensures clear calls, and the single-click "GO" button simplifies management of music, calls, and voice assistants like Siri or Google Assistant.
However, the trade-offs become apparent when considering extended use. The battery life is rated at 12 hours, which is respectable but significantly shorter than the Sony alternative. If you plan to wear these for a full day of studying or working without access to a power outlet, you will likely need to recharge them mid-day. The retro theme and plastic construction give it a distinct feel, but the shorter battery and lack of multipoint connectivity mean it is best suited for single-device users who value style and sound tuning over all-day endurance.
• Best for battery life → Sony WH-CH520L. With 50 hours of playtime compared to 12 hours, the Sony model is the clear winner for marathon listening sessions.
• Best for visual customization → We Are Rewind EQ-001. Only the Rewind offers interchangeable ear pads in orange, yellow, and black to change the look.
• Best for multitasking → Sony WH-CH520L. The Bluetooth multipoint connection lets you stay connected to two devices at once, a feature the Rewind lacks.
• Best for sound shaping → We Are Rewind EQ-001. The three dedicated EQ modes (Signature, Balanced, Bass Boost) offer instant tonal shifts without needing an app.
• Best for comfort duration → Sony WH-CH520L. The 310g weight and on-ear design are optimized for long wear, whereas the Rewind is heavier at 0.1 kg.
• Best for quick recharging → Sony WH-CH520L. A short 10-minute charge yields 90 minutes of use, whereas the Rewind requires a full 2-hour charge time.
• Best for retro aesthetic → We Are Rewind EQ-001. The vintage styling and color options appeal to those wanting a nostalgic vibe.
• Best for hands-free calling → Sony WH-CH520L. While both have microphones, the Sony includes noise-canceling technology for calls to reduce ambient noise.
For most people, especially students or professionals spending long hours in a library, I would buy the Sony WH-CH520L. The sheer convenience of a 50-hour battery and the ability to connect two devices simultaneously solves the two biggest pain points of daily headphone use: forgetting to charge and managing multiple gadgets. While the We Are Rewind EQ-001 offers fun customization and good sound modes, the 12-hour battery limit and lack of multipoint connectivity make it less practical for heavy daily use. If you need a reliable tool for productivity and long study sessions, the Sony is the smarter investment.
Yes, both models work well in libraries. The Sony WH-CH520L uses sound isolation and a lightweight on-ear design, while the We Are Rewind EQ-001 offers an over-ear fit that naturally blocks more ambient noise. Neither has active noise cancellation, so they rely on physical design to create a quiet zone.
No, the We Are Rewind EQ-001 has three built-in EQ modes accessible directly via the controls. The Sony WH-CH520L allows for deeper customization through the Sony Headphones Connect app, but basic sound quality is ready out of the box.
The Sony WH-CH520L is much faster for quick charging, providing 90 minutes of playback from just 10 minutes of charge. The We Are Rewind EQ-001 requires a full 2-hour charge cycle to reach its maximum capacity, making it less flexible for rushed mornings.
Both support the standard frequency range of 20 Hz to 20,000 Hz. The Sony WH-CH520L includes DSEE technology to enhance compressed audio files, which can improve the clarity of streaming content. The Rewind focuses on tone balancing with its specific EQ modes rather than file enhancement.
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