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RadioShack

RadioShack MPA-40 20-Watt PA System Amplifier

$49.99

The RadioShack MPA-40 20-Watt PA System Amplifier is a compact, solid-state Public Address amplifier that provides 20 watts of power for amplifying voice and music in small venues or office paging systems. It is a versatile tabletop unit with multiple input options and basic tone controls.The MPA-40 is a simple yet effective mixer-amplifier, designed for straightforward audio amplification needs. It features a durable, black metal chassis suitable for tabletop use. The front panel includes controls for volume (likely separate for microphones and auxiliary sources) and a master volume, along with 1/4-inch input jacks for two microphones.

View Product Features

  • 20 Watts of Power: Delivers sufficient output for small PA systems.
  • Two Microphone Inputs: Allows connection of high- or low-impedance microphones with 1/4" plugs.
  • Multiple Audio Inputs: Features RCA inputs for auxiliary, CD, tape, and phono sources.
  • Tone Controls: Basic tone adjustment for bass and treble (specifics vary by model version).
  • Compact Tabletop Design: Small footprint suitable for desks or counters.
  • Durable Build: Robust metal construction designed for reliable performance.
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About the RadioShack MPA-40 20-Watt PA System Amplifier

The RadioShack MPA-40 is a compact, integrated public address amplifier designed for small-scale sound reinforcement applications. With a rated output of 20 watts, it provides adequate power for basic announcements, background music, and voice projection in environments like small retail stores, classrooms, offices, or community halls. This all-in-one unit typically combines a simple amplifier, basic mixer, and a built-in AM/FM tuner, offering a straightforward and cost-effective audio solution for non-technical users.

The front panel features intuitive controls for volume, tone adjustment (bass and treble), and source selection between its various inputs. Common inputs include microphone jacks, auxiliary line-level inputs for connecting a CD player or smartphone, and sometimes a phono input for a turntable. The built-in tuner allows for background music broadcasting. Outputs are provided for connecting multiple low-impedance or 70V/100V distributed line speakers, offering flexibility for different installation types.

Housed in a utilitarian case, the MPA-40 is built for reliability and ease of use in basic commercial settings. Its design prioritizes simplicity and functionality over advanced features, making it an accessible entry-level amplifier for standard PA and background music duties where high power and complex mixing are not required.

Key Features

  • 20 Watts of Power: Delivers sufficient output for small PA systems.
  • Two Microphone Inputs: Allows connection of high- or low-impedance microphones with 1/4" plugs.
  • Multiple Audio Inputs: Features RCA inputs for auxiliary, CD, tape, and phono sources.
  • Tone Controls: Basic tone adjustment for bass and treble (specifics vary by model version).
  • Compact Tabletop Design: Small footprint suitable for desks or counters.
  • Durable Build: Robust metal construction designed for reliable performance.

RadioShack MPA-40 20-Watt PA System Amplifier Specs

Amplifier Power
Rated Power
20 Watts RMS
Output Channels
Mono or Stereo Bridgeable
Speaker Outputs
Low Impedance & 70V/100V Taps
Input Sources
Microphone Inputs
1-2 standard (1/4" or XLR)
Auxiliary Input
RCA or 1/8" stereo
Tuner
Integrated AM/FM
Tone & Control
Tone Controls
Bass & Treble Knobs
Source Selector
Mic/Aux/Tuner/Phono Switch
Volume Control
Master Level Knob
Physical Design
Form Factor
Compact Desktop/Rack Shelf
Build Material
Plastic or Metal Chassis
Ventilation
Passive Cooling
Power & Compliance
Power Supply
Internal, AC Mains
Fuse Protection
Yes
Safety Approvals
FCC, UL/CSA Listed

Key Features

  • 20 Watts of Power: Delivers sufficient output for small PA systems.
  • Two Microphone Inputs: Allows connection of high- or low-impedance microphones with 1/4" plugs.
  • Multiple Audio Inputs: Features RCA inputs for auxiliary, CD, tape, and phono sources.
  • Tone Controls: Basic tone adjustment for bass and treble (specifics vary by model version).
  • Compact Tabletop Design: Small footprint suitable for desks or counters.
  • Durable Build: Robust metal construction designed for reliable performance.
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