{"type":"video","version":"1.0","html":"<iframe src=\"https://www.loom.com/embed/815444292e2345be878312f972d2be68\" frameborder=\"0\" width=\"894\" height=\"670\" webkitallowfullscreen mozallowfullscreen allowfullscreen></iframe>","height":670,"width":894,"provider_name":"Loom","provider_url":"https://www.loom.com","thumbnail_height":670,"thumbnail_width":894,"thumbnail_url":"https://cdn.loom.com/sessions/thumbnails/815444292e2345be878312f972d2be68-42e14d5960ff54a8.gif","duration":634.28,"title":"Reference Tension vs Effective Stiffness Explained","description":"This Loom explains how reference tension and effective stiffness determine a racket’s real string bed performance over time. The speaker says players and technicians should communicate reference tension by setting the machine to 44, while effective stiffness depends on the reciprocal of string bed stiffness measured by devices such as the RDC and Flex4 (for example 24.8 on RDC and 22.9 on Flex4). They emphasize that the string bed stiffness or ASPS in pounds is the benchmark because string tension and stiffness decrease after leaving the shop, changing tomorrow and beyond. An example setup uses main tension 37.4 pounds and cross tension 23.4 pounds. The speaker also mentions measuring via equipment like StringSense and similar machines."}