Not enough information. I have no idea what a Rica is. Are you running the amp stereo, parallel (aka mono) or bridged? That will determine the proper Speakon jack to use, and how it should be wired. Also if you’re using a 3.5 mm stereo to 1/4" stereo adapter, and are using a cable with mono (TS) plug ends between the adapter and the amp, that won’t work.
Wayne A. Pflughaupt