The styles , To me the SD series sound like a pretty good live band , but Audya sounds like a great live band. The Audya is way more in your face with drums that just have the dynamics of a really good drummer that sounds so good. Now this is only my opinion but just listen to SD9 16 beat ballad then to Audya, Rock styles etc. and compare, to me , a big difference, plus I like the looks of Audya over SD series. I think many others will agree also. Be blessed and hope for Audya return.

Gordon. , Mr. G.
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Mr. G ,OASYS , KRONOS ,Jupiter 80 , AUDYA 5, Midas Venice ,Danley Labs sm-60f's ,Danley TH mini subs, QSC KW 122's,118 sub , Senhieser and Heil , Audix VX-10 , TC_Helicon ,ZOOM 9200, Lexicon ,Alesis ,AKG solid tube ,AB international Power Sub3600