BSS Audio FDS-355 OMNIDRIVE Owner's Manual - Manual (Page 7)

7
Automatic Phase Compensation
Automatic phase compensation is employed in the FDS-355 to maintain zero
phase difference between adjacent bands, even in 4 and 5-Way systems,
where the phase errors due to the effects of closely spaced crossover filters
can be significant. Phase compensation helps you to keep the response of the
system with the minimum of 'fiddle factor' adjustments.
Headroom Management System (H.M.S)
Headroom Management System manipulates the gain structure to make
maximum use of the dynamic range of critical components, resulting in lower
noise levels with sensitive amplifiers, where limiter thresholds are low.