The FP410 uses Shure IntelliMix® to dramatically improve audio quality by providing greater gain-before-feedback, reducing the pickup of ambient noise and reverberation, and virtually eliminating comb filtering effects. IntelliMix® combines three key features: NOISE-ADAPTIVE THRESHOLD activates a microphone for speech but not for constant room noise; MAXBUS limits the number of activated microphones to one per talker; LAST MICROPHONE LOCK-ON keeps the most recently activated microphone open until a newly activated microphone takes its place.