What is the difference? SDA CRS/CRS+

I will be picking up a like new pair of SDA CRS speakers Friday. I have a pair of SDA SRS 2.3tl's that have been giving me smiles since 1998 when I got them from my uncle.
I was reading up on the CRS and see several mention the CRS+ Is this a factory different model, or an upgrade CRS? Thanks for the help.

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