SoundTube SA502
SoundTube 2x50watt Class D AMP


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The SA502 is 50-watt per channel (4 ohm) Class D amplifier with maximum gain of 34 dB. Input options include balanced stereo euroblock, unbalanced line level mini jack, and a stereo speaker level (amplified) euroblock input for applications with low wattage speaker outputs. The SA502 has three operating modes: stereo, dual mono, or bridged mono. In stereo, each input channel flows directly to its corresponding output channel. In dual mono, the left input is fed to both output channels. In bridged mono, the left input is fed to the bridged output. System includes selectable 12-32 v external trigger input or auto standby to conserve energy

Small, powerful and cost-effective, the SA502 is engineered for external amplification with SoundTube and other high-fidelity speakers. Additional applications include digital signage, education, point of purchase, museums, surgical centers, AV carts or any application where a small amplifier is needed to boost a limited source output (e.g., computers, A/V projectors, etc.).


  • Frequency Response(-3 dB)  20 Hz - 20 kHz
  • Max Gain  34 dB (8 ohm)
  • Power per channel @ < 10 % THD  55 watts (8 ohm) 2 x 70 watts (4 ohms)
  • Power per channel @ < 1 % THD  50 watts (8 ohm) 65 watt (4 ohm)
  • Bridged mono power @ < 1 % THD  90 watts (4 ohm)
  • Power Supply/Requirements  32 v DC, 3.75A
  • Signal to Noise  > 83 dB (50 watts)
  • Input Impedance  47 kohm line level, 600 ohm balanced
  • Input Sensitivity  0.5 v line input
  • High-pass filter (F3)  120 Hz (12 dB per octave) selectable
  • Height  30.5 mm (1.2 in.)
  • Width  99.1 mm (3.9 in.)
  • Length  101.6 mm (4.0 in.)
  • Weight - amp only  0.26 kg (0.56 lbs)

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