We have a ex-demo set of these superb speaker decoupling platforms for sale. System enhancer and helps greatly with floor and room issues.
Improved bass definition, clarity, smearing greatly reduced. A few light scratches on the top plates, else very good condition.
Plate size (406mm w x 460mm x 75Kg) fits just about most speakers in the UK £545 ono

http://www.coherent-systems.co.uk/contact.asp