A stereo pair refers to a set of two audio speakers or images that work together to create a three-dimensional sound or visual experience. Full definition
Most likely, a group or stereo pair setting may have been changed. (polkaudio.com)
It doesn't do stereo pairing, per se, but will help you get a bigger sound across more of your home. (pocket-lint.com)
And if you're going to do that, why not go the full Monty and add a true stereo pair of speakers in the form of the Edifier Luna e25 HD. (techhive.com)