Inputs
| Model | E2 Gen 2 | E2 | E2 Jr. | S3–4K | S3–4K Jr. | EX |
| Input cards | 8x | 8x | 4x | 3x | 2x | 2x |
Each Gen 1 card accommodates either 4x HD inputs, 2x 2560 x 1600 inputs, or 1x 4K input. Each Gen 2 input card accomodates 2x 4K input.
The EX expansion box does not ship with cards; cards must be purchased separately. Each EX expansion box has two general purpose card slots, each of which may support any E2 input or output card.
| Card type | Connector Type |
| HDMI™/DisplayPort input card (Gen 1) | 2x HDMI™ 1.4 connectors 2x DisplayPort 1.1 connectors |
| Dual Link DVI input card (Gen 1) | 2x Dual Link DVI-D connectors |
| SDI input card (Gen 1) | 4x BNC connectors supporting 3G-SDI |
| HDMI™ 2.0 input card (Gen 2) | 4x HDMI™ 2.0 connectors |
| Quad Channel DisplayPort input card (Gen 2) | 4x DP 1.2 connectors |
| Tri-Combo input card (Gen 2) | 1x DP 1.2 connector 1x HDMI™ 2.0 connector 4x BNC connectors supporting 12G-SDI |
| Genlock input | 2x BNC connectors (Input and loop output) Supports black burst* and tri-level analog signals |
Depending on the model, each Event Master processor is shipped with the following input cards:
| Model | Inputs via input cards |
| E2 Gen 2 |
|
| E2 |
|
| E2Jr. |
|
| S3–4K |
|
| S3–4K Jr. |
|
| EX |
|