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Ampex Master Equalization Curve (AME)

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  • Ampex Master Equalization Curve (AME)

    Around 1958, Ampex developed an equalization curve which strove to provide a wider dynamic range and improved signal to noise ratio in an era before the development of noise reduction techniques. This curve was referred to as the Ampex Master Equalization Curve (AME) and was designed to be superimposed on the Standard NAB (IEC2) 15 ips equalization curve. In other words, it was a separate system used on top of the NAB EQ curve for 15 ips reel to reel tapes.

    This curve will reverse the AME curve. Again, it is not to be used as a stand-alone EQ curve. Your Reel to Reel machine will have to properly decode the Standard NAB 15 ips curve first before you apply this. All modern professional reel to reel decks reverse the NAB curve as a standard feature but I know of none currently marketed that reverse the AME curve.

    This curve provides the best accuracy when used with transfers operating at 96 kHz sampling rates. It is within around 2 dB of the theoretical curve over the entire audio spectrum from 20 Hz to 20 KHz. The accuracy is slightly reduced when using 44.1 or 48 kHz Sample rates.

    Download this curve into your Paragraphic Equalizer using the Manage Presets feature in your Diamond Cut software.

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    Last edited by Craig Maier; 07-30-2019, 02:42 PM.
    "Who put orange juice in my orange juice?" - - - William Claude Dukenfield