Vintage JBL L-80T's ("T" denotes titanium dome HF transducer) soon to be replaced by Egglestonworks Andra II's. Marble stand weighs 397 lbs. (totally dead to any vibrations in my situation). 1/4" threaded rod, nuts and washers, Michael Green designs 2" solid steel spike footing and top caps, also Michael Green cable grounds. This design is not mine. Michael Green in the mid/late 90's originated this design with his 'clamprack'. The credit goes toward him. Thank you Michael. Sorry for the blurry pic.