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Surround back speakers
The THX Surround EX format adds new “Surround Back” (SB) channels to the conventional 5.1-channel system. This makes it easy to achieve
sound positioned directly behind the listener, something that was previously difficult with sources designed for conventional multi surround
speakers. In addition, the acoustic image extending between the sides and the rear is narrowed, thus greatly improving the expression of the
surround signals for sounds moving from the sides to the back and from the front to the point directly behind the listening position.
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