Precision Audio and AV Interface Products

Radio Design Labs

ST-MA2 2 W Mono Audio Amplifier with Muting - 8 Ω

  • Single-Speaker Monitor Amplifier
  • Conferencing Monitor Amp
  • Monitor Amp with Muting and Externally Actuated Attenuation Steps
  • Fast, Silent Audio Switching
  • Multiple Control Inputs
  • Adjustable Gain
  • Overview
  • Specifications
  • Related Products
  • Accessories
  • Downloads
  • How to Buy
  • Product Series
  • Dimensions

The ST-MA2 is a compact audio monitor amplifier with control inputs to mute or reduce the gain of its output. This module may be used in conjunction with other RDL® modules to configure automatic mixing systems or may be used alone as a single-speaker monitor amplifier. The ST-MA2 is typically used to drive a small tabletop or overhead monitor speaker in a conference room, boardroom, courtroom, public forum panel or similar installation. The ST-MA2 is ideally suited for use in automatic mixing systems due to its control inputs.

The line-level input may be wired balanced or unbalanced. The audio output will drive standard speakers from 4 to 45 Ω. Normal gain is preset by means of a trimmer on the module.

For tabletop installations, use the ST-MA2 with the WDG1 and RU-SP1.

Applications

Input Impedance:
20 kΩ Balanced or Unbalanced Bridging
Input Level:
-10 dBV minimum for 2 Watts RMS output
Output Impedance:
8 Ω (will drive 4 Ω loads)
Output Power:
1.75 Watts RMS Continuous; 2 Watts RMS max.
THD+N:
< 0.5%
Bandwidth:
45 Hz to 14 kHz
CMRR:
> 60 dB (50 Hz to 120 Hz)
Residual Noise:
< -80 dB (below 2 Watts RMS)
Switching Time:
< 50 us
Attenuation (Muted):
> 90 dB (1 kHz),
> 85 dB (300 Hz to 3 kHz)
> 75 dB (20 Hz to 20 kHz)
Selectable Attenuation:
3 dB or 6 dB, each setting individually selectable using two independent inputs (connect to ground to activate, 0.3 mA)
Ambient Operating Environment:
0° C to 40° C
Power Requirement:
GROUND-REFERENCED, 24 Vdc @ 200 mA for rated output (220 mA @ 2 Watts RMS)
Package Type:
Cardboard Box
Package Dimensions:
2 x 2 x 4 in.
Shipping Weight:
0.195 lbs.
WEEE weight:
0.145 lbs.
Tariff code:
8543.70.9860

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

ST-MA2 ST-MA2