Meridian Unplugged - Powered by MrTechGuy.co.uk Forums Discussion Meridian - Systems IL65 Root Cause

Quick update and background:

My TV triggers a surround processor to turn on via HDMI-CEC. The processor then triggers an external relay power strip using trigger outputs. My 3x DSP5000v2's are powered by this strip and I slam them all on at once with the unit power switches always set to "on."

Nothing scientific here, but I checked the comms cables and soldered them all up like Median specs but there was no improvement- still pretty frequent IL65's on all three units. I remembered reading someplace on the internets that power quality on mains switching and startup was suspected as a root cause, so I increased the trigger delay in the processor to my relay power strip to 1s, then finally to the max of 3 seconds. This separated the startup surge of the 85" TV and the surround processor from the speakers. The result is, anecdotally, much less frequent IL65's. Pure conjecture at this point: I wonder if power quality is messing up the timing or quality of the initial EEPROM load into the microcontroller. The next time I have the speaker backs off I'll add some filtering (capacitance) to the main DSP board power rail. The idea being the capacitance will quiet and synchronize the startup of all the DSP board components.