Dynamics Plug-Ins : Dynamics III : Dynamics III Shared Features and Controls : Dynamics III LFE Enable

Dynamics III LFE Enable
(Pro Tools HD and Pro Tools with Complete Production Toolkit Only)
The LFE Enable button (located in the Options section) is on by default, and enables plug-in processing of the LFE (low frequency effects) channel on a multichannel track formatted for 5.1, 6.1, or 7.1 surround formats. To disable LFE processing, deselect this button.
 
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The LFE Enable button is not available if the plug-in is not inserted on an applicable track.