The KZ Castor Pro Bass Up Edition headphones are professional wired Hi-Fi in-ear monitors (IEMs), specially designed for those seeking full and powerful low-end sound. They feature a dual dynamic driver configuration with two 10 mm drivers, delivering exceptionally deep bass without sacrificing clarity in the mid and high frequencies. Their acoustic tuning is based on the Harman target curve, further enhancing the dynamics of the low frequencies. With a frequency response range of 20 Hz - 40,000 Hz, sensitivity of 103 dB, and impedance of 16 - 22 ohm, they ensure a rich and detailed listening experience across every music genre.

One of the main advantages of the model is the built-in four-stage electronic filter of high precision. Through physical switches located on the body of the earphones, you can manually adjust the bass, midrange, and treble frequencies. This hardware tuning capability allows you to tailor the sound character to your own preferences, enjoying personalized audio without the use of external apps or equalization software.

The outer shell of the earphones is made of durable zinc alloy and metal elements, while the inner chamber is made of skin-friendly resin. The retail package includes a flat cable measuring 1.2 m made of oxygen-free copper (OFC) with TPE coating, gold-plated 0.75 mm connectors, and a standard 3.5 mm plug. The in-line remote integrates a microphone and a multifunction button for easy call and music playback control, while also providing effective passive noise isolation.