The HB 596 HD DI has 4 separates sonar beams ...
2 for DI and 2 additional beams for 2d...:
Down Imaging® w/ DualBeam PLUS™
w/SwitchFire™
200 kHz / 28° @ -10db this is 2d
455 kHz / 16° @ -10db this is 2d
455 kHz / 75° @ -10db this is DI
800 kHz / 45° @ -10db this is DI
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The Elite 5x DSI has 2 DI sonar beams...:
Operating Frequency...:
455kHz this is DI
800kHz this is DI
Rickie