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Better heat dissipation, to air or to the mounting, on the Kenwood?

I measured both "on the bench" more or less -- completely exposed on the nav table on my boat. The cases look pretty unremarkable and similar....

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Uneven current? Perhaps the Kenwood draws peaks of 4A with a very low duty cycle (i.e. averaging a very low current -- probably a switch-mode PSU would do this), the JVC's current is steady, and your ammeter isn't averaging the Kenwood current in the way you might hope?

Peter

Now I hadn't even thought of that. I've got a decent Fluke DMM, but I have no clue about cycling and averaging with respect to different PSUs. I suppose one "real world" way to figure that out is hook 'em both up and see how long each one takes to completely kill a Type 27 deep-cycle battery!
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Jim


'Tis the exceptional fellow who lies awake at night thinking of his successes.