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Rodyweil

RO03 Mic Preamp,2026 Upgraded, 66db Gain, 120db EIN Ultra Low Noise, for Dynamic & Condenser & Ribbon Microphone & Instrument,with XLR/TRS/TS Line Out, Type C Power Input

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Model: RO03


Features

  • 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 version boasted a maximum gain of 75dB, which was unattainable in actual use. Moreover, severe background noise would occur when the knob was turned to around 70dB, causing great inconvenience to many users.This update sets the gain range at 19~66dB, a value that is fully achievable in real-world use. Even at maximum gain, no obvious noise is produced, making it highly practical.
  • The TS instrument input in the old version featured low impedance, resulting in signal distortion and frequency loss due to impedance mismatch when used as a DI box for instruments.This time we have increased the instrument input impedance to 1M, greatly improving performance for musical instruments. Note: The two input ports cannot work simultaneously.
  • With the rise of individual streamers, more recording scenarios have moved from traditional studios to outdoor environments. Therefore, we switched the power supply to Type-C for enhanced portability.We also replaced the old power supply scheme with a new one that offers wider compatibility, suits more power supply conditions, and reduces the chance of current noise for individual users.
  • We have also found that some noise issues are caused by improper connections. Our tests show that connecting the preamp to the XLR input of an audio interface produces higher noise than connecting to the TRS input.Therefore, we strongly recommend users connect the preamp to the TRS Line input of the audio interface with suitable cables for the lowest noise.

Description

Rodyweil is a professional manufacturer of microphone preamps, built on years of experience in analog circuit design and production. With strong engineering and manufacturing capability, we create reliable, high-performance preamps at an affordable price. From entry-level to professional grade, every Rodyweil product delivers clean, powerful sound — because great audio should be for everyone. A preamp amplifies all signals — including noise. To get a clean sound, start by improving your recording environment with basic sound treatment. Next, set your gain properly to avoid overload or distortion. Finally, use a noise reduction plugin in post-processing. With these steps, you’ll achieve a clear and professional sound.

Recommended Uses For Product: Instrument Recording, Vocal Recording


Brand: Rodyweil


Model Name: RO03


Connectivity Technology: XLR


Connector Type: USB Type-C, XLR/TRS/TS


Special Feature: 3 output simultaneous usable, EIN‑120dBV, extremely low noise‑floor, Variable gain 19~66db, with +4dbU & -10dbV output See more


Compatible Devices: Amplifier, Audio Interface, Audio Mixer, PA System, Speaker


Color: Black


Included Components: 1 * Power Adapter, 1 * Power Cord, 1 * RO03 Mic Preamp, 1 * User Manual


Polar Pattern: Unidirectional


Connectivity Technology: XLR


Connector Type: USB Type-C, XLR/TRS/TS


Special Feature: 3 output simultaneous usable, EIN‑120dBV, extremely low noise‑floor, Variable gain 19~66db, with +4dbU & -10dbV output


Compatible Devices: Amplifier, Audio Interface, Audio Mixer, PA System, Speaker


Polar Pattern: Unidirectional


Audio Sensitivity: 66 db


Impedance: 1000000 ohm


Microphone Form Factor: Handheld


Power Source: Corded Electric


Signal-to-Noise Ratio: 120 db


Number of Channels: 1


Frequency Response: 20 KHz


Audible Noise: 75 db


Item Weight: 400 g


Item Dimensions: 3.54 x 3.94 x 4.33 inches


Antenna Location: Instrument Recording, Vocal Recording


Brand: Rodyweil


Model Name: RO03


Model Number: RO03


Built-In Media: 1 * Power Adapter, 1 * Power Cord, 1 * RO03 Mic Preamp, 1 * User Manual


Manufacturer: Rodyweil Audio


UPC: 616859152007


Mfr Part Number: RO03


Color: Black


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Wednesday, Oct 14

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Top Amazon Reviews

    • Nice and quiet.
Nice and quiet. I had been using a Tascam recorder as a preamp, but had a little noise on a 50 ft. XLR run to a weatherproof box under my front deck, where I keep the dynamic mic. Decided to try this preamp, and the amplification factor is about the same, but the noise floor has dropped about 6 dB. I was pleased that the box is STEEL, because it allowed me to mount it under a shelf with magnets. de KØUNX, Jim in Jefferson County, Colorado. ... show more
Reviewed in the United States on May 13, 2025 by James J. Flannery, KØUNX
    • it's a solid microphone amp
I bought this To amplify my Sennheiser Microphones which I use with Dragon NaturallySpeaking for speech recognition. It is very solidly built and provides clean amplification. I changed out the power supply for third-party power supplies that I use with all of my audio equipment to make sure that there's no noise. The sound is very clear which is necessary for speech recognition. However, it does not provide any additional warmth like the ART preamps that I use for voice recording but it's about one third the price of those units. while the sound is a little dry, it doesn't sound unnatural on my zoom calls. I can't comment on singing are instrumental application since I don't do that. ... show more
Reviewed in the United States on January 31, 2025 by pls1
    • Nice little single channel preamp with a lot of gain, useful for low-output dynamic/ribbon mics
I was interested in trying this because it offers a lot of clean gain (75 dB) for the price, which I thought might be useful for low-output ribbon & dynamic mics. I did a little a/b test comparing the Rodyweil to the built-in preamps of a Yamaha mixer -- the Rodyweil definitely has a LOT more clean gain, which is nice and useful. I tried it with an SM57 and an sE ribbon microphone and it's loud enough for both, without needing something like a cloudlifter. I also tried the line input, and also a condenser mic with the phantom power button engaged, and both worked fine. My only complaints are (like others mentioned) the unbalanced mini jack outputs, which are a pain -- 1/4" would be a lot more useful. Also, when I tried turning the gain knob up and down, most of the action seems to happen towards the very end of the control's travel -- it's fairly quiet quiet quiet and then at the end gets REALLY LOUD, rather than a smooth transition. Also: the little spec sheet that comes in the box describes this as a "2-channel" preamp, which AFAIK usually means a stereo unit, or something with two separate inputs & outputs. This is a mono, single-channel preamp. It does have separate XLR and 1/4" inputs, and you can run a mic and a line signal through both inputs at the same time, but you've got just the one output. For the price, though, I think it's pretty good, and I'm planning on using it on various recording projects. ... show more
Reviewed in the United States on May 27, 2023 by eli c
    • Great product - OUTSTANDING customer service!
My initial impression was that the unit was well made. It's heavy, in a sturdy metal enclosure, and the switches and ports seem to be of high quality. I am using it in conjunction with a Fostex cassette 4-track, and I had some technical hook-up questions. My email was answered within a few hours, and the customer service rep was incredibly helpful. We exchanged a few emails until an optimum solution was suggested. The preamp works perfectly, and in fact even makes a very low end mic work/sound great. I am 100% satisfied with my purchase and would happily buy more products from this manufacturer. ... show more
Reviewed in the United States on December 21, 2024 by Richard G.
    • Lots of noise.
Sounded like it was picking up radio waves. Tried new cables, and different plugs, but nothing helped.
Reviewed in the United States on December 29, 2024 by J. Dodd
    • tune up
GOOD
Reviewed in the United States on July 18, 2025 by Guy Bisserette
    • So clean and tight feedback!! Love it!!!
I had to dig through a lot of junk in my shed to find my dusty ol' mic. It has a filter to keep popping and other noises you don't really want down to a minimum. I hooked up my amp to this preamplifier and voila! Gain was the first thing I noticed. No feedback, but significantly louder mic output. I love that, I usually have issues with feedback and organizing distances of my equipment to deter that. My voice came through cleaner than I had imagined. This preamp is compact as well, I could fit it in my pocket, but not with jeans on. Overall, this preamp is very nice and beneficial in many applications of use, I highly recommend getting one! ... show more
Reviewed in the United States on May 31, 2023 by Jason Sills
    • Very Noisy Preamp and Not Useable for Recording
Review Image by Sam Sam
Review Image by Sam Sam
I was looking forward to using this unit as I've only read good reviews about it. The unit itself appear to be well-built, with smooth operating buttons and knob. Then I tried to use it... First thing I noticed is that as soon as I plugged in an XLR cable from my Audio Interface to the output of the Rodyweil booster, a very loud and constant hiss was being pumped into the interface. This was even before turned the unit on. I discovered that this hiss is produced whenever phantom power is being sent from the interface. Ok I just need to remember to keep the phantom power off to the unit. Then I turned the unit on, and immediately there was hiss again... this time much quieter than with the unit off and phantom power applied, but still quite significant. I then plugged in my Shure SM7B, and I could clearly hear the mic, yet the background hiss remained, even at its lowest gain setting. I made sure it wasn't my cable or interface, by bypassing the Rodyweil booster and plugging the mic directly into the interface. The hiss is completely gone. I then tried to use the booster again and make sure all the connections were firmly plugged in, and they were. Listening carefully to the background noise, I could not only hear the hissing but other high-pitched sounds that swept from lower frequecies to higher inadible frequencies. Additionally, I noted that turning the gain control knob introduced additional static noises at times. Perhaps my unit was just defective, but it is not useable at all with the very high noise floor and strange high-pitched sweeping sounds being introduced to the mic input. I also noted that in the Q&A section, the first thing mentioned in the included sheet pictured, is a question about noise. They seem to lay blame on the environment, as if its normal with a mic booster. This is not normal. I'm returning this unit and getting a different booster. ... show more
Reviewed in the United States on July 24, 2024 by Sam Sam

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