Precision Audio and AV Interface Products

Radio Design Labs

STM-DA3 Microphone Level Distribution Amplifier - 1x3

  • Feed 1 Microphone to 3 Microphone Inputs
  • Electrical and Audio Isolation
  • Studio Quality Low-Noise, Low-Distortion Performance
  • Excellent Phase Response
  • Versatility of STICK-ON® Compactness
  • Overview
  • Specifications
  • Related Products
  • Accessories
  • Downloads
  • How to Buy
  • Product Series
  • Dimensions

The STM-DA3 is designed for use in quality commercial sound, broadcast and recording applications. The 1.2 kΩ balanced input accepts a wide variety of microphone input levels without loading professional low impedance microphones. A multi-turn trimmer is user adjustable for either gain or loss in order to match the facility standard microphone levels. Three balanced outputs provide nearly total isolation between the output lines. Unlike mic-splitting transformer systems, the STM-DA3 also provides audio isolation. In fact, the audio isolation is so good that a +4 dBu signal fed into one output is still below the noise floor on the adjacent output. Loading of one output including a direct short, has no effect on the other outputs.

The STM-DA3 is built on the electrical architecture of RDL's low-noise studio quality mic preamplifiers. Dynamic or condenser microphones may be used with the STM-DA3. Standard 24 V phantom is supplied to the input when the supply voltage is connected to the PHM terminal. Optimum operating level is set using RDL's unique Dual-LED VU meter, located adjacent to the terminal block. A green LED illuminates at 15 dB below optimum level. The intensity of the green LED progresses from minimum to full intensity over a 15 dB range. The adjacent red LED illuminates when the operating level exceeds the optimum level. This makes the STM-DA3 easy to set up without any external test equipment, and operating levels may be monitored at the module

For Mic to Line level distribution, use the RDL STM-LDA3.

Videos

Applications

Input:
1.2 kΩ balanced
Outputs (3):
-45 dBu, 150 Ω balanced
Gain Range:
17 dB (Adjustable, 25-turn trimmer)
Control Fully CCW:
Gain = -5 dB
Control Fully CW:
Gain = 12 dB
Frequency Response:
30 Hz to 20 kHz (± 0.2 dB)
THD+N:
< 0.1%
IMD:
< 0.1%
Noise:
< 80 dB (below -50 dBu output, -50 dBu input)
Headroom:
> 20 dB (-50 dBu output, -45 dBu input)
CMRR:
> 60 dB (100 Hz to 5 kHz)
Output Isolation:
> 135 dB (balanced audio)
> 150 dB (common mode)
Ambient Operating Environment:
0° C to 55° C
Power Requirement:
GROUND-REFERENCED, 24 Vdc @ 40 mA
Package Type:
Cardboard Box
Package Dimensions:
2 x 2 x 4 in.
Shipping Weight:
0.2 lbs.
WEEE weight:
0.145 lbs.
Tariff code:
8543.70.9860

Documents:
Format
PDF
CAD Files:
Format
High Res Images:
Format
Declaration of Conformity:
Format
PDF
A&E Specifications:
Format

Direct Dealer Program


Becoming an RDL direct dealer is quick and easy. To become a direct dealer, your company must meet the following requirements:

  • Must be an A/V contractor, sound contractor or system integrator

  • Must possess a current resale certificate for your state

Click here to submit a new direct dealer account inquiry.


Buy Online

STICK-ON SERIES

STICK-ONs are the original application-specific modules for the A/V, recording and broadcast industries. Module functions include signal detection, switching, pre-amplification, format conversion, line driving, power amplification, mixing, distribution, gain control, equalization, routing and more. Each STICK-ON is an ultra-compact module engineered to provide higher performance and longer life than other industry products. STICK-ON modules are solid encapsulated hybrid circuits in durable industrial black plastic enclosures (1.55", 3.94 cm x 3", 7.62 cm x 0.65", 1.65 cm) with clear bold white lettering for the terminal block connections, recessed trimming controls and switches.

Since RDL first originated application-specific modules, STICK-ONs have led the industry in economical, high-performance and cost-effective long life solutions in system designs. Multiple STICK-ON modules can be interconnected to form all or part of an A/V system. A single STICK-ON module may be mounted right where its function is needed, often to add an input, output, or gain adjustment to existing equipment. STICK-ON modules allow customizing an A/V system to precisely match users’ needs. Adding STICK-ONs to an existing system can extend system life by adding updated features, resulting in considerable cost savings. A complete range of backboard and rack mounting options is available for systems comprised of multiple STICK-ON modules.

The technology used in STICK-ON modules has been regularly updated over the years to insure industry-leading performance. Functions and features provided by STICK-ONs, since their introduction, are still available today. This continuity in product offering and support makes STICK-ON modules the preferred long-term resource for system design solutions. STICK-ON SERIES modules are designed and manufactured in the U.S.A.

STM-DA3 STM-DA3