The passive ambient feature allows environmental or outside noise to mix in with the music. Noise Isolation with the ambient port open/unplugged is reduced from the 26dB to 12dB. This feature is designed primarily to aid professional stage musicians transitioning from traditional wedge speakers to in-ear monitors. Once an artist becomes comfortable with In–Ear Monitors, the ambient port can be sealed. Our experience is less than 5% of our artists use this feature.