But wait, remove the grilles and ... what's all this?

If we zoom in, we see what that Ocelot connects to and where the hole beside the sub-woofer goes. In addition to those ADI products, I see he has a WaterBug too!

Zoom in further and we see John's home-built relay board. Each of his 8 SECU16 outputs connects to a relay to provide isolation and increase their current carrying capacity to 10A each.