To connect your EDGE A to your EDGE W you will need to run either unbalanced RCA cables or balanced XLR cables from the Pre Outs to the input on the EDGE W.
With this setup, you will be using the EDGE A as a dedicated Preamplifier.
Unbalanced
Balanced
Finally to achieve power syncing you will need to run the Link Wire from 'Link Out' on the EDGE A to 'Link In' on the EDGE W. This way when you turn the EDGE A On/Off the EDGE W will also.