Inside the headphones, a hybrid system with 10 radiators is controlled by a specially designed crossover. It uses a 4-band frequency crossover for air conduction drivers (DD, BA and EST) and an independent 2-band crossover for BCD drivers. The dynamic driver provides dense, "solid" bass, two armature radiators are responsible for the mid-frequency range, two more BA drivers form a clear response in the HF region, and a pair of EST radiators provide outstanding expansion in the ultra-high frequency range.