Hi Guys,asking a question on behalf of a friend who is looking at purchasing a pair of used DD66000s. The pair he is looking at has S/N XXXXX on the rear. Upon contacting Harman they say format should be AB1234-CD1234567?. Does this sound correct to anyone here. Any DD66000 owners care to chime in regards serial numbers on their speakers please?. Much appreciated. He is looking at moving a lot of his JBL collection(1400 Array,250Ti,XPL200 etc)and grabbing these,his "Dream" JBLs.