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AO-28 Preamp Frequency Response Plots, normalized to the response at 1 kHz at max gain.

These plots (especially the log plot), illustrate the loudness contour effect built into the AO-28's Expression Control circuitry.

https://lh3.googleusercontent.com/-wAJ8J8QMB0I/Vnw8TxDx4pI/AAAAAAAAFDI/XJFqel7ScBM/s732-Ic42/b3-1k.png https://lh3.googleusercontent.com/-H9cXHkULbXY/Vnw8W8fQLpI/AAAAAAAAFDY/YvEm7Xhct1I/s734-Ic42/b3-10k.png https://lh3.googleusercontent.com/-OGGLAN-alzc/Vnw8W83UsxI/AAAAAAAAFDU/koG8H2doFkc/s734-Ic42/b3-log.png

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