I have a set of LEs. As far as I know, it is a slight mod on the regular ADK A51s mics. It is a matched pair (matched by B&K), has bass roll off and -10 db pad.
The A51s is their standard studio mic methinks...
The Hambrg and Vienna I think are variations of the A51s. They feature slightly different electronics.
I have no idea of the actual technical differences...
I did see the the TL series is offered in a TL matched pair set... Nice!
Look for JP Geraud, he's a ADK guru...
Terry