I'd say that connections 1 and 5 ("I") are inputs. There's a notation on the board that the input is "bi-wire" (presumably to support a bi-amp configuration).
All of the connections labeled "E" are common connections.
The connection labeled "T" goes to the tweeter. This half of the board is configured as an LC high-pass filter — capacitor in series, inductor in parallel with the load.
The connection labeled "B" goes to the bass driver. This half of the board is configured as an LC low-pass filter — inductor in series, capacitor(s) in parallel with the load.
- 1 and 3 are the input from the amplifier for the tweeter
- 2 and 4 go to the tweeter itself.
- 5 and 6 are the input for the woofer (bass)
- 7 and 8 go to the woofer itself.
If you are single-amping this, then you can connect 1 and 5 together, as well as 3 and 6.