The Heil Parametric RX Audio System is an equalizer specifically designed to pull weak signals out of HF radio. The EQ and powered speaker are sold as a kit (for now) and are also sold separately, so you can use the PRAS equalizer with another speaker you might already have. Watch the demo video for what comes in the box, and how I tune in a weak signal. The audio quality came through the video feed better than I suspected it would.
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