ONIX, SOLIX, APEX, HELIX G2N, G3N, G4N in 8” and larger have a dedicated DI piezoe ...
DI is wide (side to side) and narrow (front to back) and needs movement to create a discern-able image ...
A stationary DI will show targets as horizontal lines across the screen (because the beam is repeatedly hitting the same target over and over) ...
Rickie