Designed for musicians who need strong low-end without losing clarity.
The BK Audio J4 PRO is built for those who want a powerful, warm, and character-rich sound while maintaining the fidelity and precision that define BK Audio.
With a 4-driver Balanced Armature architecture (2 Low, 1 Mid, 1 High), it delivers extended response—solid bass, articulate mids, and brilliant highs—creating an immersive, dynamic, and perfectly balanced listening experience.
Crafted with BK Audio 3D precision technology, the J4 PRO Custom Mold ensures an anatomical fit, superior acoustic isolation, and exceptional comfort. It’s the ideal choice for bassists, drummers, and stage musicians who need power and detail at the same time.
Two dedicated low-end drivers deliver deep, powerful bass with precise control and no distortion—perfect for musicians who want punch, warmth, and presence.
Its 4-driver system maintains articulate mids and sparkling highs, achieving a natural and accurate sound across the entire frequency spectrum.
Made with BK Audio 3D technology, it molds perfectly to the ear canal, providing maximum comfort and full sonic immersion.
Built with hypoallergenic medical-grade resin and customizable finishes (clear, metallic, glitter, or BK Audio solid colors).
| Specification | Detail |
|---|---|
| Driver Configuration | 4 × Balanced Armature (2 Low, 1 Mid, 1 High) |
| Crossover | 2-way passive |
| Frequency Response | 20 Hz – 20 kHz |
| Sensitivity | 104 dB SPL / mW |
| Impedance | 21 Ω |
| Noise Isolation | −26 dB (passive isolation) |
| Connector | 2-pin 0.78 mm universal |
| Cable | Premium braided 8-core, 150 cm, detachable |
| Construction | Medical-grade hypoallergenic resin with BK Audio 3D technology |
| Weight | ~6.9 g per earpiece |
1 pair of BK Audio J4 PRO Custom Mold In-Ear Monitors
150 cm premium braided cable (8-core)
Custom BK Audio hard protective case
Professional cleaning accessories
Custom Mold models do not use eartips, as they are handcrafted to perfectly fit the customer’s ear canal.
Images are for illustration purposes. Colors, finishes, and designs are fully customizable.
Manufactured with BK Audio 3D precision technology 🇲🇽
Production time: 4-6 weeks
1 year on drivers
1 month on mold fit
1 month on cable (manufacturing defects only)
Warranty does not cover damage caused by water, sweat, or excessive volume.
The BK Audio J4 PRO combines powerful low-end, precise mids, and detailed highs into the perfect blend of strength and definition.
Ideal for musicians who want monitoring with character, punch, and professional accuracy in every performance.
BK Audio J4 PRO — Precision-crafted with 3D technology for musicians seeking energy, detail, and total comfort.
