The Symetrix 528E is an industry standard analog voice processor with 5 major functions in a single-rack-space unit. Features: microphone preamp with a switchable 15 dB pad; front panel mic/line level switch; 48V phantom power; voice symmetry switch (phase rotator) that corrects for excessive positive or negative signal peaks; de-essing with frequency and range controls; compression/limiting with downward expansion; 3-band parametric equalization. Balanced XLR mic and unbalanced 1/4" line level inputs; balanced XLR and unbalanced 1/4" outputs; 1/4" in and out patchpoints on each section.