In subjective listening tests. natural sound sources were presented to subjects as vertically-oriented phantom images from two layers of loudspeakers. ‘height’ and ‘main’. Subjects were required to reduce the amplitude of the height layer until the position of the resultant sound source matched that of the same source presented from the main layer only (the localisation threshold). https://safeersappliancers.shop/product-category/hide-built-in-60cm-a-electric-single-oven-stainless/