High quality audio playback requires faithful reproduction of low, middle, and high frequency portions of audio. Low frequency sound playback on small devices such as mobile phones is difficult because of the relatively small size of the transducers used and other constraints. This disclosure describes a charging stand with a built-in speaker that receives and plays low frequency portion of audio from a phone coupled to the stand. The speakers in the phone are utilized for playback of other portions of the audio. Low frequency audio content is obtained using a low pass filter on the phone and is sent via a wireless link, such as Bluetooth or NFC. This provides is a less expensive mechanism for audio playback than speakers or stands that reproduce the entire frequency range of audio.
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Zevola, Luigi, "Wireless charging dock with low frequency speaker", Technical Disclosure Commons, (December 11, 2019)