Rodyweil RO03 Mic Preamp, 1 Input & 3 Outputs. 19-66 dB Variable gain, 5V 1A Type-C Power Input, -120 dB EIN Ultra-Low Noise, for Microphone or Instrument as DI Box

The 2026 latest version focuses on noise reduction, improving the EIN to -120dB, achieving professional-grade noise performance. When connecting the preamp to an audio interface with the proper cable (such as a 1/4 inch TRS cable), it delivers an extremely clear signal, allowing you to obtain professional recording results on a low budget.

The previous unit claimed 75dB max gain but only hit 60dB in practice with noticeable background noise — many copied versions still keep this flaw. Though the rated gain figure appears reduced, our new mic preamp works much more powerfully in actual use. It offers true usable gain up to 66dB and ultra-low noise at all gain levels.

The earlier model advertised simultaneous XLR & TS operation. Sound may come through with both connected, yet shared PCB design causes frequency loss under dual load. We reworked it to support only one active input at a time for full signal fidelity. Many replicated models are built on our 6‑year‑old PCB and keep this defect. For dual-mic recording, pick our RO03 dual mic preamp.

As live streaming and podcasting keep growing, many creators are moving their recordings out of formal studios into home, bedrooms and outdoor spaces. That’s why we equipped this mic preamp with a Type‑C 5V1A power input. It works with nearly any USB power source — regular phone chargers, power banks and more. No picky power requirements, so you can set up and record easily anywhere.

The old version claimed suitability for instrument input, yet its TS input impedance was only around 2kΩ. This low impedance fails to capture the full tonal character of instruments, especially high-impedance pickups. We’ve upgraded the TS input impedance to approximately 1MΩ. It preserves the natural tone of high-impedance instruments perfectly, and this mic preamp can also function as a DI box.