
STM-1 Comparison
| photo | price | summary | rating |
|---|---|---|---|
![]() | $95.00 | Condition is Open box, Radio Design Labs RDL STM-1 Microphone Preamplifier , shipping cost = $8.25 | 100.0% |
| photo | price | summary | rating |
|---|---|---|---|
![]() | $92.50 | Condition is New, Radio Design Labs RDL STM-1 Stick-On Single Channel Microphone Preamplifier, shipping cost = $14.00 | 100.0% |
![]() | $109.00 | Top Pick! Condition is New, RDL STM-1 Microphone Preamplifier - 50 dB Gain, shipping cost = $16.72 | 100.0% |
![]() | $125.00 | Condition is New, RDL STM-1 Microphone Preamplifier 50 dB Gain Phantom 24V Balanced, shipping cost = $5.62 | 100.0% |
![]() | $154.46 | Condition is New, RDL STM-1 Microphone Preamplifier - 50 dB Gain, FREE SHIPPING | 99.8% |
![]() | $185.36 | Condition is New, RDL STM-1 Microphone Preamplifier 50 dB Gain Phantom 24V Balanced, FREE SHIPPING | 99.8% |
![]() | $208.81 | Condition is New, RDL STM-1 Stick-On Series Microphone Preamplifier - Power Supply Not Included, FREE SHIPPING | 99.3% |
| photo | price | summary | rating |
|---|---|---|---|
![]() | $50.00 | Condition is Used, RDL Radio Design Labs STM-1 Stick-On Microphone Preamplifier (58.75-279-8), shipping cost = $17.21 | 98.1% |

The RDL STM-1 Microphone Preamplifier from Radio Design Labs is a high-performance, studio-grade microphone preamplifier designed for professional recording applications. This compact, yet powerful unit delivers exceptional audio quality, making it an ideal choice for recording studios, broadcast facilities, and live sound applications.
At its core, the STM-1 employs a transformer-coupled, discrete Class A circuit topology, which provides a warm, rich sound with minimal distortion. The preamplifier features a wide gain range of 0 to 72 dB in 3 dB increments, allowing users to easily adjust input levels for various microphone types and recording scenarios. The input impedance is a standard 1500 ohms, making it compatible with most dynamic, ribbon, and condenser microphones.
The STM-1 boasts a low noise floor of -128 dBV, ensuring that the microphone's natural sound is captured without unwanted noise. The phantom power supply is switchable between 12V, 24V, and 48V, accommodating a diverse range of condenser microphones. The preamplifier also offers an 80 Hz high-pass filter and a -20 dB pad, providing additional flexibility in handling difficult input sources.
The front panel of the STM-1 features a clear, easy-to-read VU meter, which displays the input level in real-time. The unit also includes a phase reverse switch, allowing users to correct phase issues and ensure accurate sound reproduction. The preamplifier is housed in a rugged, 1U rackmount enclosure, with gold-plated XLR inputs and outputs for reliable connectivity.
The RDL STM-1 Microphone Preamplifier is a versatile and reliable solution for capturing high-quality audio, offering a rich, warm sound, a wide gain range, and a low noise floor. Its robust design, combined with its user-friendly features, makes it a popular choice among audio professionals and enthusiasts alike.
RDL STM-1 Microphone Preamplifier: A Comprehensive Analysis
The RDL STM-1 microphone preamplifier is a popular choice among audio professionals due to its robust construction, versatile features, and high-quality sound. In this analysis, we will examine the pros and cons of investing in the RDL STM-1 microphone preamplifier to help you make an informed decision.
Pros:1. Superb Sound Quality: The RDL STM-1 delivers exceptional sound quality with a low noise floor, making it an excellent choice for recording vocals, instruments, or live performances. Its high-headroom design ensures that the microphone's natural character is preserved, enabling engineers to achieve superior results.
2. Versatile Inputs: The preamplifier supports a wide range of microphone types, including dynamic, condenser, ribbon, and even line-level sources. This versatility makes it an ideal solution for various recording and live sound applications.
3. Durable Construction: The RDL STM-1 features a rugged steel chassis, ensuring that it can withstand rigorous use in professional environments. Its industrial design is not only visually appealing but also built to last.
4. Easy-to-Use Controls: The preamplifier offers a simple, intuitive layout, making it easy for users to access essential features such as phantom power, polarity reversal, and input impedance.
5. Affordable: Given its high-quality components and robust design, the RDL STM-1 offers exceptional value for its price point. It is an excellent option for studios and live sound applications where multiple microphone preamps are required.
6. Low Power Consumption: The RDL STM-1 consumes minimal power, making it an eco-friendly choice for those concerned about energy efficiency.
Cons:1. Limited Equalization: The RDL STM-1 does not offer an equalizer or other tonal shaping features. This may be a drawback for some users who require more precise control over the sound.
2. No DI Input: The preamplifier does not include a direct input (DI) for connecting instruments directly. This may be a limitation for live sound applications where a DI is necessary.
3. Lack of Remote Control: The RDL STM-1 does not offer remote control functionality, which may be a disadvantage for users who require hands-free operation.
Conclusion:The RDL STM-1 microphone preamplifier offers exceptional sound quality, versatile inputs, durable construction, and easy-to-use controls at an affordable price point. Its limitations, such as the lack of an equalizer, DI input, and remote control, may be inconvenient for some users. However, considering its strengths, the RDL STM-1 is an excellent choice for studios, live sound applications, and audio professionals seeking a reliable, high-quality microphone preamplifier.
Recommendation:If you are looking for a high-quality microphone preamplifier with exceptional sound quality and versatile inputs, the RDL STM-1 is an excellent choice. Its rugged construction, easy-to-use controls, and affordability make it a popular option for audio professionals and hobbyists alike. However, if you require additional features such as equalization, a DI input, or remote control, you may want to consider alternative options to meet your specific needs.
Details:
It is a product of the Rdl brand, known for producing high-quality audio equipment.
specifications audioproequip:
- brand: Rdl
- mpn: Stm-1
- model: Radio Design Labs Rdl Stm-1
- part type: Radio Lab Microphone
- features: Microphone
returns audioproequip:
- policy: no returns
seller audioproequip:
- rating: 97.0%
- # reviews: 322
- city: morristown, new jersey
offer audioproequip:
- best offers: true
- prices: $50.00–$208.81
- item condition:
- Open box
- New
- Used
- started: february 27, 2025
- sold #: 19
- in stock #: 5
- options: ship-to-home
- availability: in stock
shipping audioproequip:
- class: standard
- transit: 4-9 days
- carrier: usps
- type: calculated
- service: usps ground advantage
general audioproequip:
- category: Musical Instruments > Pro Audio Equipment Parts
payments audioproequip:
- wallet: google-pay
- credit card: mastercard
- other
Also Viewed:
- STACR1: RADIO LAB, Rdl
- ST-GCA3: RADIO LAB LEVEL CONTROL AMPLIFIER, Rdl
- ST-VCA2: RADIO LAB CONTROL AMP, Rdl
- STD-600: RADIO LAB, Rdl
- RDL-RLC-10R: REMOTE RADIO LAB LEVEL CONTROL ROTARY, Rdl
- STA-1: RADIO LAB AMPLIFIER, Rdl
- ST-PD5U: RADIO LAB, Rdl
- ST-PA2: RADIO LAB AMPLIFIER, Rdl
- RLC2: REMOTE RADIO LAB LEVEL CONTROL, Rdl
- RU-VCA1D: RADIO LAB ATTENUATOR, Rdl
- ST-LCR2: RADIO LAB, Rdl







