The In-Ear Monitor CONCERT are assembled by combining eight Balanced Armature type receivers with a three-way cross-over. They have a dual driver subwoofer that reproduce balanced and full-bodied low frequencies, dual receivers dedicated to the mid-range that makes a clear and dynamic sound, a double tweeter emitting high crystal clear frequencies and a super tweeter. The result is an acoustic immersion that conveys every detail and emotion in the listener. The sound quality is excellent and makes In-Ear Monitor CONCERT professional systems dedicated to very demanding musicians and entertainers. The isolation of about 26dB from the outside allows you to listen securely at a lower volume. Like other In Ear Monitors, they are compatible with wireless transmission systems and portable media devices.