"If you can build it, than I'd recommend building two - they really don't take a lot to drive them in terms of Watts/channel. The SPUDS have a nice form factor to fit behind your Khorns, thus allowing you to move the Khorns forward about a foot and in the process potentially getting much better stereo imaging from them."
How would you go about building SPUDS behind the Khorns (assume you mean Klischorns), which I'm using as my mains? What is used as a source, is the signal to the Klipschorns split?
Also someone asked about ceiling height, which is a 9'2" suspended ceiling (seems I'm always running wires or playing).