IO AUDIO SOGNO in-ear monitors feature a 2DD+6BA configuration and a 5-way crossover. This means that each driver is responsible for a specific frequency range, for a smooth, harmonious sound.
Volare in-ear monitors from IO Audio are IEMs featuring a hybrid 1DD+4BA+4EST design. The dynamic driver handles the low frequencies and channels, while the Balanced Armature drivers the mids and the electrostatics the highs, resulting in an extended frequency response of 10Hz-40kHz.