If you don’t solder the RCA or phone jacks onto the HiFiBerry PCB, you can use small RCA jacks mounted on the top of an existing plastic Raspberry Pi case. Just drill two holes into the case, mount the RCA connectors, and connect them by short wires to the L/GND/R connector on the Raspberry Pi board. Note, that in our example, there are no video-out, line-out and USB connectors on the board. But this will also work with a fully populated board. We just used one of our test boards where some connectors had been removed before.