The Excelon decks have built in controls that will alter the settings on an Excelon amp, and the amps will send info on it's operating status back to the deck for display on the screen. Had them on my last couple of decks, never had an Excelon amp to play with, so.....

If you're interested, more info can be found here.

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BigRedGuy
Still bumpin' after all these years
Kenwood/AudioControl/Orion/JL Audio/Lightning Audio