Developed by AMS (Advance Music Systems), which was founded in 1979 by two Aerospace engineers in England, the DMX 15-80S is a stereo delay / pitch-shifter unit was used extensively on records from the 1980s and is still widely used today.

One of the main uses of this device was as a stereo widening effect on vocals. Here, essentially the unit is acting as a mono-to-stereo pitch-shifter/delay. On both the left and right channels, the signal is delayed different amounts between 5 and 30 milliseconds so one channel is a little ahead of the other, and then one side is pitch-shifted down a few hundredths of a semitone and the other is shifted upwards. The delayed left and right signals then appear hard left and hard right and the vocal will appear to be spread across the stereo image. The unit is also great for adding width on an entire mix.

Inputs: 2 XLR inputs, electronically balanced, 10K impedance.

Outputs: 2 XLR outputs, electronically balanced, 150 ohms impedance.

Maximum gain: 20 db. Maximum output level: 24 dbV.

Distortion: Less than 0.035% at 1khz full output.

Dynamic range: 90 db.

Frequency response: 20 Hz to 18 kHz -3db, + 0db

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