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Polk Audio Signa S3 vs Vizio SB3820-C6 2.0 Soundbar (2015)
No sources that perform objective hands-on testing have deemed the Polk Audio Signa S3 worthy of being included in their Soundbar roundups, which typically isn't a good sign.
Moving on to the Vizio SB3820-C6 2.0 Soundbar: no sources that perform reliable and objective hands-on testing have included it in their Soundbar roundups, which usually means that a product doesn't make for a good purchase.
As a last step, we wanted to do a head-to-head Polk Audio Signa S3 vs. Vizio SB3820-C6 2.0 Soundbar comparison of their review performance but, unfortunately, weren't able to find any review ratings on either product.