This is true. The safety brake needs to be very close to the blade. Sawstop offers brakes for 10 in and 8 in blades (usually a dado blade). Sawstop has great customer service. Call them to confirm.
Brian Johnson
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This discussion on Lumberjocks is about this issue and has a simple solution.
https://www.lumberjocks.com/topics/181682
It also looks like it would be dangerous if the safety mechanism were triggered while using a fretting blade.
Steve