Radial Engineering StageBug SB-4 Compact Active Piezo DI

To Help Eliminate Feedback on A Live Stage, the Sb-4 Is Equipped with A High-Pass Filter and 180° Polarity Reverse Switch. the High Pass Filter Eliminates Excessive Bottom End Which in Turn Reduces Resonance that Can Cause the Instrument to Vibrate. the 180° Polarity Reverse Helps Reduce Acoustic Hot Spots on Stage by Changing the Phase Relationship Between the Pa System and Room Acoustics Which Can Combine at Certain Frequencies to Create Peaks.