the A8 was looking at RCA input, fake got red colour line for positive, ori got no difference, both +ve and -ve is black line
RA40 no idea la, the A8 also was from the net, other DLS dealers help pun the pics up on DLS website
only advise i can give is to buy from reputable shops who are authorised dealers. if u buy 2nd hand, make sure got distributor's sticker, and then maybe u can call them up to check against the serial number