update:
wait a second...
I looked some stuff up on google and happened to find this:

http://www.hbo.com/city/interiors/carrie.shtml

above the text, there is a slideshow-ish thing that allows you to see 6 pictures, the last one shows you a photo of her living room, where you can see the speakers...

http://www.hbo.com/city/cast/charact...bradshaw.shtml

next to the text there is a 'button' named 'interior zoom' which opens a pop-up, here, click 'carrie's living room', and then click on the circle around the lamp, then you can see a more detailed pic of the speakers...


this however, does not prove that the speakers are real, and as for what I could make out of them, they could be any budget monitor...

Keep them spinning,
Bert.