qdc / 4Pro

＜＜February 2026 New Product！＞＞The 4Pro is a universal IEM featuring 4BA drivers, celebrating the brand's 10th anniversary, and is multi-use with a unique single-rod linked filter that allows for switching between three modes: Hifi, Studio, and Live.

■ Unique Single-Rod Linked Filter Technology Supports 3-Mode Switching
・The 4Pro features a unique single-rod linked filter technology, supporting multi-use. A single switch allows you to switch between professional sound settings—"Hifi" for listening, "Studio" for studio monitoring, and "Live" for live monitoring—while achieving improvements in tonal balance, bass depth, high-frequency extension, and expanded range. It provides users with a multidimensional experience and extremely simple operation.

■Japan-Exclusive Design
・The 4Pro for Japan is a Japan-exclusive design. It features a fully clear shell and faceplate to showcase qdc's unique, beautiful shell processing technology. The silver edges and 4Pro logo add accents, further highlighting the beauty of the IEM itself.

■Newly Developed Cable and 2-in-1 Multi-Plug
・The 4Pro cable uses a newly developed silver-plated 4C single-crystal copper cable. It combines durability and ease of handling, delivering low-loss transmission and a neutral sound. The connector uses a QDC 2-pin connector, highly reliable for professional use. The plug features a newly developed screw-lock type for secure connection and a 2-in-1 multi-plug that allows easy switching between 3.5mm unbalanced and 4.4mm balanced connections. The 4Pro for Japan uses an L-shaped plug for both 3.5mm and 4.4mm connections.

■Newly Developed Carrying Case and New Packaging
- The 10th anniversary model, the 4Pro, comes with a wide range of accessories and a newly developed carrying case. It also comes in special new packaging.

Specifications
■Product Name: 4Pro
■Driver: BA type (Customized BA)
■Number of Drivers: 4BA / 4 Drivers (Single Side)
■Type: Closed-back
■Frequency Response Range: 10-30,000 Hz
■Input Sensitivity: 105-108 dB SPL/mW
■Impedance: 10-23 Ω
■Noise Reduction: 26 dB
■Cable
・4Pro Cable: Silver-Plated 4C Single Crystal Copper (Approx. 120 cm)
・Connector: QDC 2-pin (0.78 mm)
・Plug (L-Shaped): 3.5 mm, 4.4 mm
■Accessories: 4Pro Cable, 3.5 mm Unbalanced Adapter (L-Shaped), 4.4 mm Balanced Adapter (L-Shaped), 3.5 to 6.35 mm Adapter, QDC Tips Includes: 3 pairs of soft-fit silicone ear tips (S/M/L), 3 pairs of silicone double-flange ear tips (S/M/L), flight adapter, cable clip, cleaning tool, and original carrying case.
■Country of Origin: China
■Manufacturer's Warranty: 1 year for the product, 6 months for the cable and accessories.
*The warranty period for this product begins from the date of purchase. Please be sure to keep your receipt, invoice, and dated receipt.
*Images and specifications are subject to change without notice to improve performance and quality.
*The above specifications are based on information current as of January 2026.