Not very familiar with the ad3 chip,but dusty vawter still does upgrades and repairs on AA gear.I believe the company is Channel Islands Audio in califournia.Hope this helps.
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the revision ad or ad3 is the same thing (previous versions were called revision a and revision b). i have both the revision b chip and the revision ad or ad3 chip which is the one currently installed. i would've gladly answered your question had you asked me. i purchased the most current chip from hcm audio who if you go to their website is the contact for dusty vawter of channel islands audio mentioned above. i'm sorry i wasn't clear enough to you, i tried to tell you everything i knew about the unit. going over our emails, the first email i sent to you mentioned that the chip was in fact the ad revision and was the most recent. i'm not here to screw people over just to unload a few pieces of gear now that i don't need them. if you have any other questions please email me and i will try my best to answer them for you.