RDL STM-3 – High-Gain Mic Preamp, 45 to 75 dB Gain is backordered and will ship as soon as it is back in stock.
Shipping Availability*
Shipping Availability*
Free Ground Shipping on Most Orders Over $250.00
Looking for the best price or expert advice? Give us a call at 1-888-230-3661 or use the Live Chat below. Buying 1 or 100, you may qualify for greater savings beyond the advertised price.
What is the RDL STM-3?
The RDL STM-3 is a low-noise microphone preamplifier for surveillance, commercial sound, broadcast and recording where higher than normal gain is required. Gain adjusts from 45 to 75 dB.
How does it work?

It accepts high or low impedance microphones and provides two outputs that can be wired balanced or unbalanced. Filtered 24 Vdc IEC phantom capability is available for condenser microphones. The supply input operates from 24 Vdc, and operation from 12 Vdc is possible with 6 dB less headroom. Each output drives high or low impedance loads, and a 24 Vdc supply such as the RDL PS-24AX 24 Vdc power supply is recommended. STICK-ON modules mount in the RDL STR-19B racking system or on a rear rack rail with the RDL ST-RRB1 rear rack rail kit.
What are the key features?
- High gain range — Gain adjusts from 45 to 75 dB for distant or low-output microphones.
- Low-noise design — Low noise and distortion suit surveillance and broadcast pickup.
- Two outputs — Two outputs provide +4 dBu balanced or -10 dBV unbalanced levels.
- Phantom capability — Filtered 24 Vdc phantom supports condenser microphones.
- RF-filtered inputs — Input filtering helps reject radio frequency interference.
At Creation Networks, we do everything we can to create an excellent customer experience. This includes fast shipping and easy returns.
- Most in-stock orders placed Monday-Friday ship within 24-48 hours. General restrictions apply; please see our full shipping policy here.
- We offer a 30-day return policy from the delivery date on many products. Product restrictions apply. Restocking fees for the return of open-box items. Please see our full return policy here for more information.
Nationwide Audiovisual Services, Design, Installation & Support
Creation Networks is a trusted nationwide partner for complete audiovisual solutions — delivering expert AV system sales, professional design, programming, installation, and ongoing support to organizations across the United States.
From Microsoft Teams Rooms and enterprise video conferencing to LED video walls, live streaming production, and hybrid collaboration systems, we provide end-to-end AV integration using premium, certified technology from industry leaders including Crestron, Q-SYS, Shure, Extron, and Absen.
Whether you operate a single location or manage facilities nationwide, Creation Networks ensures your AV systems are designed for reliability, scalability, security, and long-term performance — helping your organization communicate more effectively and operate at peak efficiency.
CREATION NETWORKS — A PARTNER YOU CAN TRUST SINCE 2006
























