I switched out the single JBL speaker for a set of JBL stereo speakers and still pick up the hum. Twisted all the connectors, piddled here and there, still can't remove the buzz in the audio. Had the 3G hotspot stop working for awhile, had to reset all three laptops.
Beautiful weather, winds died down from a buffeting head/side wind.
I should have brought a multiple CD changer instead of this old Nakamichi single player. Oh, someday it will work fine and keep going all day.