This page is as up-to-date as possible, but recipes are subject to change, especially between updates. It is worth noting that all recipes here assume that you have the previous tier spawner in the recipe, e.g. a tier 1 requires a broken spawner, and a tier 4 requires a tier 3. The main difference between each tier is the number of spawners that can be placed within the activation radius increases along with the spawn rates (more mobs per spawn and more frequent spawn attempts.) Also, when placing spawners, you must place the highest tier spawner last in order to take advantage of the maximum amount of allowed spawners in the activation radius.