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SoundTube - MA501T - Low-Voltage Mono Power Amplifier

SoundTube - MA501T - Low-Voltage Mono Power Amplifier

The MA501t is a low-voltage mono power amplifier engineered for use in distributed sound applications. Designed for use with SoundTube and other high-fidelity speakers, the MA501t provides 50 watts of output power at 25V, 70V or 100V. A 12V trigger is provided for auto-on/off functions. Recessed gain control is available via the front panel; this deters unauthorized tampering with levels or other settings.

The MA501t is ideal for distribution of mono audio to speakers throughout a facility. Applications include hospitality, corporate, retail, education, government, themed entertainment and other commercial applications.


  • Compact high-output, constant voltage 50 W amplifier
  • Audio grade toroidal output transformer
  • Rugged extruded aluminum housing
  • Taps for 25V, 70V, 100V
  • Balanced inputs (Euroblock) and unbalanced inputs (RCA)
  • Euroblock outputs
  • Signal sensing Auto-on or 12v trigger
  • 30 Hz – 20 kHz +/- 0.5 dB frequency response
  • Peak output detector and indicator (clipping), power LED
  • Recessed screw adjust input gain
  • 120 Hz high pass switch
  • Overload, Short Circuit, DC and Heat Protection
  • Versatile mounting options: pole, rack or chassis
  • Small size – 1.2” x 3.9” x 8”


Product MA501T - Low-Voltage Mono Power Amplifier
System Type MA501T 50 W 70V amplifier
Amplifier Power 50 watts RMS <0.5% THD
Output 25V/70.7V/100V
High Pass Filter – Switchable 120 Hz @ 12 dB/octave
Overall Response 30 Hz – 20 kHz +/- 3 dB @ 1 watt < 0.2% THD
Output Power 50Hz-20 kHz @<1% THD 50W @ 25/70/100V
Power Band Width Response 50Hz - 20 kHz +/- 3 dB
Inputs RCA Unbalanced/Single Euro Block Balanced
Maximum Input Sensitivity 500 mV for full output
THD+ Noise <.1% below rated output power
S/N >84 dB un-weighted
Input Impedance 20K unbalanced, 15K balanced
Protection Features Amplifier-Overload, Short Circuit, DC and Heat Protection Power Supply- Thermal protection, Over current protection, Short circuit protection
Front Panel Indicators Power/Standby, Clipping LEDs
Power Supply Input: 100-240VAC 50/60 HzOutput: 32 VDC @ 1.6 A
Current consumption 120V 0.6 A/AC
Operating Voltage 100-240 VAC with approved power supply
Height x Width x Depth 32.0 mm (1.25 in.) x 100.0 mm (3.9 in.) x 200.0 mm (7.9 in.)
Weight - amp only .73 kg (1.6lbs)
Packaging One per box
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