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Polk Audio F/X Wireless surround Home Audio Speaker …
https://www.newegg.com/polk-audio-f-x-wireless-surround/p/N82E16882290218
Amazon.com: Customer reviews: Polk Audio F/X Wireless ...
https://www.amazon.com/Polk-Audio-Wireless-Surround-Sound/product-reviews/B0049Z89MS
In 2013 I bought, for $145, the innovative Polk wireless F/X back-channel speaker. It worked beautifully and supplemented my other speakers well, providing lower-volume sound effects for 7.1 surround source material. It was especially good for sports-crowd noise and background cross-channel "movement." Then the wireless transmitter failed in 2018.
PolkAudio Wireless Surround F/X — Polk Audio Forum
https://forum.polkaudio.com/discussion/100074/polkaudio-wireless-surround-f-x
Polk's "Polk Digital Logic" DSP is used to simulate the surround speakers for a 5.1 or 7.1 system. While this might seem to be a bit ambitious, remember that surround bars are usually trying to completely enclose the listener in sound. The Wireless Surround F/X only has to cover half that area which should be considerably easier.
Amazon.com: polk audio surround sound speakers
https://www.amazon.com/polk-audio-surround-sound-speakers/s?k=polk+audio+surround+sound+speakers
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