How high above the floor should the speaker be mounted?
Originally designed to stand on three small wooden feet that held it about 4~5inches of the floor and tilted backwards, the original speaker can (of course) be mounted on stands that raise it higher. I have stacked Quads that have the lower of the pair in each stack at ~35.5cm (14 inches) above the floor. This can, in some rooms, improve the width of image and height of image at the expense of some depth. However, the depth can be regained by using adequate acoustic treatment within the room. Peter Walker had a definite opinion about the height of the ESL 63 above the floor also.