TRUTHEAR Zero Blue 2 Wired Headphones (blue)

Dual Dynamic Drivers

TRUTHEAR Zero Blue 2 wired in-ear headphones are designed for dynamic, detailed sound and a well-controlled frequency response across the full range. They use two dynamic drivers, measuring 10 mm and 7.8 mm, with a redesigned acoustic chamber, nozzle and driver components. The design focuses on improved efficiency, reduced distortion and natural sound reproduction. The 3D-DLP-printed housings are manufactured by HeyGears, and the detachable cable is made from copper and silver-plated copper. The headphones are suitable for everyday listening and more demanding use, such as monitoring. A microphone cable for calls and gaming is available separately.

The redesigned 7.8 mm driver reproduces midrange and high frequencies. It features an internal magnetic system, a flexible polyurethane suspension and an LCP (liquid crystal polymer) dome diaphragm. Compared with the previous model, the magnet diameter is approximately 25% larger and the dome surface area approximately 50% larger. The high-frequency conductive structure has also been modified to improve efficiency and sensitivity at the top of the range, supporting smooth, transparent treble, extended frequency response and high resolution.

Stronger Bass Foundation

The low frequencies are handled by a modified 10 mm dynamic driver with a finely tuned solid-silicone suspension, an LCP dome diaphragm and a voice coil made with thin wire. Its redesigned bass tuning system works with a low-distortion crossover network, similar to the solution used in the Zero Red series. Compared with the original Zero, this design reduces nonlinear distortion and gives the bass greater depth and a clearer, more energetic character.

Precise Frequency Division

The acoustic chambers and crossover system were redesigned using experience gained from earlier TRUTHEAR headphones with dual dynamic drivers. The design aims to improve both drivers’ efficiency while keeping each within its selected frequency range, significantly increasing the sensitivity of the complete system. A filtered nozzle, precisely manufactured by HeyGears using 3D-DLP technology, works with a hybrid, multi-stage crossover to help the headphones’ performance match the design specifications more closely.

Clarity and Detail

Development focused on increasing overall efficiency while maintaining excellent linear and nonlinear distortion performance. In selected frequency ranges, nonlinear distortion is lower than in the Zero Red series, helping preserve a clean background and reproduce fine details clearly. The frequency response is tuned for a broad range of listening preferences, with an optimised response in the lowest bass below 50 Hz and a smoother transition through the midrange. The treble is matched to the HRTF amplitude response, maintaining high sensitivity above 10,000 Hz.

Vivid, Coherent Sound

Compared with the first Zero model, the Zero Blue 2 incorporates changes that affect both measured performance and the listening experience. It delivers a more dynamic and lively sound than the Zero Red, while the efficient high-frequency driver helps reveal subtle details in recordings and mixes. The headphones also have a consistent phase response across the frequency range. Minimising phase distortion helps maintain natural sound perception, and the increased number of internal conductors is intended to improve sound quality.

3D-Printed Housings

HeyGears manufactures the housings using precise 3D-DLP printing. The Zero Blue 2 retains stylistic references to the original Zero, with a redesigned outer panel. The optimised resin allows material thickness to be reduced locally inside the chamber without compromising structural integrity. The nozzle size and support angles have also been adjusted with comfort during extended use in mind. The skin-friendly housings are designed for multi-hour listening sessions.

Detachable Cable

The headphones use a detachable cable with 0.78 mm 2-pin connectors. The included improved, two-conductor coaxial cable combines high-quality copper and silver-plated copper. Its increased number of internal conductors is designed to enhance transmission performance, while the cable construction helps minimise tangling during everyday use. A microphone version is also available with a 3.5 mm plug, 0.78 mm 2-pin connectors and an oxygen-free copper microphone cable, as used with the TRUTHEAR Gate model; this cable is not included.

Included in the Set

• TRUTHEAR Zero Blue 2 earbuds
• Standard 3.5 mm cable
• Silicone ear tips: 3 pairs (S, M and L)
• Foam ear tips: 3 pairs in size M
• Foam ear tips: 1 pair in size S
• 5 Ω impedance adapter
• User manual

Specifications

• Manufacturer: TRUTHEAR
• Model: Zero Blue 2
• Drivers: 10 mm + 7.8 mm dynamic
• Diaphragm: Composite diaphragm made of liquid-crystal-infused LCP in a silicone suspension and liquid-crystal-infused LCP in a polyurethane suspension
• Impedance: 5.8 Ω ± 15% at 1 kHz
• Sensitivity: 119.5 dB/Vrms at 1 kHz
• THD: <1% at 1 kHz
• Frequency response range: 20–41 kHz (IEC 61094, free field)
• Effective frequency response range: 20–20 kHz (IEC 60318-4, -3 dB)