The SoundTube MA3501t audio distribution amplifier is a high performance audio amplifier that is designed for continuous use in commercial applications. The high efficiency Class “G” amplifier design offers high performance in a compact design and utilizes 2 large and efficient toroidal transformers. The power transformer's very high current design for sustained high power output and can operate with multiple input mains voltage and is thermally protected. The audio output transformer is a very low distortion design that provides very clean audio output at high power levels for 25V, 70V or 100V audio distribution systems. The MA3501t amplifier also has a direct speaker output option that bypasses the transformer for those applications where it is necessary to operate 4-16 ohm speaker systems.

Flexible audio inputs connections offer both balanced and unbalanced audio signals. The switchable peak limit anti-clipping circuit to help keep the audio clean and undistorted at high output levels and also a switchable high pass filter to avoid over driven bass distortion and speaker line transformer saturation from low frequencies. The MA3501t also provides the installer with remote turn on and off provisions that can either be switched by an external 12VDC source with loop through provisions or set to a program input sensing position that provides turn on and standby operations in the presents or absents of an audio signal. Both of the remote features mute the amplifier audio output when no signal is present to avoid any stray hum or noise being reproduced in the standby mode.

• Efficient Class G high current mono-block 350 W amplifier
• Large Toroidal power transformer and audio output transformer
• Taps for 25V, 70V, 100V and bypass
• Balanced inputs (Euroblock) and unbalanced inputs (RCA)
• Euroblock outputs
• All controls located on rear panel
• 30 Hz – 35 kHz +/- 0.5 dB frequency response
• User-selectable limiter
• 3-position subsonic filter
• Automatic music sensing
• 12V trigger for remote activation/deactivation
• Overload, short circuit and heat protection along with peak output protection

Tech Sheet

Installation Guide