The SD2 can address 48 fixtures. When you have more than 48 as in your case, you can combine several fixtures of the same type into one. If you have some small fixtures, 8 channels or less, combine them into small groups under one fixture number. The max channels for any one fixture is 32 so you can combine 4 - 8 channel fixtures. Read the manual section "multi fixture" in the "menu" chapter. This will explain how to set that up.
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