Aurex AD-4 Automatic Dynamic Range Expansion System

This Aurex AD-4 is a noise reduction system with Adres noise reduction, it was first sold by Aurex in 1980 and discontinued 3 years later in 1983.

The main AD-4 features are.

Level meters used on the Aurex AD-4 noise reduction system are analog needle VU reading meters.

The Toshiba Adres noise reduction system used in the Aurex AD-4 expands the tape playback dynamic-range greatly right across the frequency range reaching an incredible 100dB at 1kHz. Signal-to-noise ratio is improved dramatically: by 30dB at 10kHz eliminating all tape hiss, and 17dB at 100Hz.

For undisturbed listening a jack connector for a pair of headphones is supplied. Connection to other audio components for plaback can be achieved by a RCA cable and recording from a source by a RCA cable.