The we13a needs good feet to support the mouth. These are like originals supporting the horn at the exterior sides of the mouth. It’s strange that when you support the 13a in the middle of the mouth it affects the sound. Actually when you listen to a pair in stereo one being correctly supported and the other not you immediately hear the difference. It’s like putting a central tension point. The mouth is 62 inch (157,5cm) side and the wood is about 1″ thick and it’s supporting a great deal of the horns weight. So that kind of all puts a lot of pressure on the centre of the mouth. When supported at the exterior there is no flex at all. 13audio make the appropriate legs to support the mighty 13a.