Back in 1987 or 88 I sold my Quad II rig in order to buy my first PC, I wish I still had it
The electrostatic speakers where awesome but you needed a large room because they had to be 3 feet away from the wall to get the bass to reflect properly.
The picture on Wikipedia is just of one channel, there was an identical amp for the other.
You would have to spend a big chunk of change to buy that system today.
http://en.wikipedia.org/wiki/Quad_Electroacoustics