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Volume changes when switching what you're listening to | Acoustic Wave® system II
acoustic-wave®-system-ii
Acoustic Wave® system IISold from 2006 - 2017

Volume changes when switching what you're listening to | Acoustic Wave® system II

Volume level decreased when switching from FM source to AM.

This is normal operation as AM signals are inherently lower in volume. This is due to a lower signal to noise ratio then FM.
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Volume changes when switching what you're listening to | Acoustic Wave® system II