It should be obvious that they are or not. Just as Ben had said also the dust cap for the driver should have Proac on it. If none of these exsist I would say first of all, who is the guy? Are they for sale here at AG? I would go with your gut.
How can I tell if authentic ProAc 2.5 or knockoffs
I have a chance of buying a pair of used Proac 2.5 for a good price, but there are nothing on the speakers that say the are 2.5s. No ProAc logo on the tweeter, no sticker or serial # on the back. I know there are some DIY kits out there, so I just want some inputs from you guys...Thanks.