Alto TS212s User Guide - vague description

From the user guide
"11. Extended LF: Press this switch to enable or disable the extended low-frequency response of the subwoofer. When enabled, the light will be on, and the subwoofer will play frequencies higher than its crossover frequency."

This description is a bit vague, what exactly does "the subwoofer will play frequencies higher than its crossover frequency" mean? Does it mean the subwoofer will play full range or just a bit higher than the standard crossover frequency?
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