Key Features：

1. Innovative Stacked Dual-Dynamic Drivers Structure – Top and bottom stacked cavity structure delivers superior acoustic performance. Side-by-side structure compared – stacked design optimizes driver integration and sound coherence.

2. Two Versions Available – Harman Target & Improved Bass – Harman Target Version (31-35Ω): Based on the Harman FR curve, enhancing low-frequency sensitivity and dynamic performance – seamless mid and high frequency alignment. Improved Bass Version (16-20Ω): Enhanced low-frequency response for more powerful bass impact.

3. 4-Switch Tunable – Adjustable Low & High Frequencies – Built-in professional-grade filters with four toggle switches. Customize your sound: Switch 1 On (bass +1dB), Switch 1&2 On (bass +2dB), Switch 1&2&3 On (mid-high +1dB), Switch 1&2&3&4 On (overall +2dB). Tailor your listening experience to your preference.

4. Flagship Performance at Entry Price – Competes with products priced 6-65 times higher. Castor ($21+) vs FH*S P*O ($190+), Z*R ($1370+), NS*0 ($130+) – exceptional value without compromising sound quality.

5. 2DD Configuration – Powerful & Detailed – Dual dynamic drivers deliver full, rich sound with powerful bass and detailed highs. Versatile performance suitable for all music genres.

6. Flat Transparent Black Cable – 3.5mm Gold-Plated Plug – Premium flat transparent black cable with excellent durability. Gold-plated plug ensures stable, lossless signal transmission.

7. Wide Frequency Response – Extended frequency range captures every detail from deep bass to sparkling highs. Easy to drive with smartphones and portable players.

Detailed images：

Introduction to the Two Versions of Castor

Harman Target Version

With the Harman FR curve as its tuning target, whether it's in terms of parameter performance or sound perception, it outperforms most flagship products from other brands

Harman Target with Improved Bass Version

Based on the Harman FR curve, enhancing low-frequency sensitivity and dynamic performance, achieving an unstoppable low-frequency experience. Simultaneously, the mid and high frequencies seamlessly align with the Harman FR curve

KZ-Castor

Tuning Adjustable Dual-Driver IEM

Challenging all flagship products in the HIFI industry with its formidable strength

Harman Target Version

Built upon the acclaimed Harman FR curve within the HIFI community, and pushing beyond its boundaries!

In the past two years, many audiophiles have been pursuing a higher degree of adherence to the Harman FR curve. Many brands have used the Harman curve as a reference to launch their flagship products. Due to the challenging nature of acoustic tuning involved in achieving the Harman curve, many brands only fine-tune their flagship products to a relatively high degree of adherence. On the other hand, some lower-priced products, constrained by technology and cost, do not follow the Harman curve style in their tuning.

KZ-Castor breaks through traditional acoustic tuning methods by innovatively adopting a dual-dynamic driver acoustic design. This approach has resulted in the perfect Harman curve that outperforms flagship products from other brands.