Using Loudspeaker Properly
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Its original use is to protect the speakers from frequencies it cannot handle.
When used correctly flat f response can be achieved, however only at pre-defined direction. Normally the on-axis (speakers' head on)
They are also split into levels of how fast it cuts out sound i.e. xdB/oct slope, e.g.
Finally the slope family i.e. how the slope looks like or behave: -
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