hypex 502

Long time lurker, first time post. Is it normal to hear an audible hum (only from the right speaker) from the Hypex Ncore NC502MP modules? I recently purchased a Audiophonics LPA-S500NC, a French made stereo amplifier that utilizes the Hypex Ncore NC502MP module. My set up is as follows...

Selling a new Ghent audio Hypex 502MP amplifier. Just built it for fun. Features 1. Air gapping wires, 2. Ton of thermal paste (Arctic MX-4), 3. Ring connectors for proper grounding, cable harnessing. Purrs like a tiger, 0 noise and thermal paste works really well keeping it cool. Selling...