BOYA BY-K4 Professional 3.5mm TRRS (Female) to Type-C (Male) Audio Adapter

Bridge the gap between your professional analog microphones and modern digital devices with the BOYA BY-K4. This ultra-compact, high-fidelity audio adapter converts an analog 3.5mm input signal into a digital USB Type-C output. Engineered specifically for content creators, vloggers, and mobile journalists utilizing Type-C Android smartphones, tablets, the iPhone 15/16 series, and Type-C iPad Pros, the BY-K4 integrates an active digital-to-analog converter (DAC) circuit. It allows you to plug standard TRRS shotgun mics, lavaliers, and wireless receivers directly into your USB-C device for crisp, low-latency recording without encountering hardware configuration errors or sudden audio dropouts.

Technical Specifications

BOYA BY-K4 Pros and Cons

Pros

• Studio-Grade DAC Signal: Features an active digital processing chip that minimizes interference, radio frequency hiss, and line degradation, keeping vocal tracks clean.
• Universal Type-C Compatibility: Works flawlessly across modern Type-C Android platforms, MacBooks, Type-C iPads, and iPhone 15/16 series devices.
• Port-Strain Minimization: At just 6.0 cm long, the ultra-short cable reduces physical leverage and downwards tension on your phone’s internal Type-C port connection point.
• No App Setup Needed: Works immediately out of the box with standard Type-C system utilities, including native camera apps, third-party video apps, and livestream feeds.
• Robust Shielding Profile: Lined internally with a braided copper mesh matrix that rejects electromagnetic signals radiating from nearby cellular antennas.

Cons

• TRRS Input Dependency Only: Designed specifically for 4-pole TRRS smartphone microphones; requires an additional standard TRS-to-TRRS adapter patch cable to accept 3-pole TRS camera mics.

• No Charging Passthrough Port: Occupies the entire phone port exclusively for audio tracking, meaning you cannot charge the smartphone battery while recording is active.

BOYA BY-K4 Variations and Price Guide

BOYA BY-K4 Suitable Application Areas

• Mobile Vlogging & Content Creation: Allows TikTokers, Instagram creators, and vloggers to connect standard lapel clip mics directly to their Type-C devices for professional dialogue audio.
• On-The-Go Field Interviews: Enables mobile journalists (MoJo) to record broadcast-clean field interviews using a professional handheld or shotgun mic attached to a smartphone rig.
• Remote Podcasting & Livestreaming: Ensures stable, low-latency microphone feeds for podcast hosts or guest contributors streaming audio directly via social media channels.
• University Lecture & Meeting Capture: Pairs with portable omnidirectional microphones to capture clear, uncompressed digital backup audio tracks directly into Type-C storage files.

Verdict

The BOYA BY-K4 is an essential, high-quality accessory for mobile filmmakers and content creators who rely on Type-C devices for daily shoots. By featuring a high-performance architecture, double-shielded cable design, and built-in DAC audio conversion, it provides a highly stable connection that cheap generic dongles simply cannot replicate. It represents a small, low-cost investment that guarantees reliable, noise-free sound.