From the sanders website (with my comments in green)
This price includes:
*Electrostatic Speakers with 1) aluminum bass driver and 2) revised transmission line This means two panels and two bass units. In combination their stated frequency response is 20Hz to 27kHz +/- 2dB
*Magtech Amplifier...
The speakers are the panels plus the bass units.
When you say "without subwoofers" are you referring to the bass units? If so, I don't think it's really possible (or sensible) to buy the panels on their own. All the wiring and panel mounting and step up transformer (to supply voltage to the...
Sanders takes directionality and runs hard with it. They are deliberately designed to beam as *much* as possible
https://3d3a.princeton.edu/sanders-sound-systems-model-11