Looks like Sony just contracted out to an ex Polk Engineer for the Es line....
http://www.stereophile.com/content/sony-es-ss-m9-loudspeaker
So really its like a re badge and a Sony product in name only.
Would be the same if they bought out the design of my speakers
and slapped the Sony name on them......that doesnt make it a Sony product,
only a Sony purchase, with the rights to brand it.
It would've been a smart move on their part, it complimented their price point in electronics.
I have no Sony products, I did, but they priced themselves out of my market.
The products I had for the most part worked well and lived long.