I agree that you should define vintage.
But having had HiFi systems since the mid 70's and hearing a lot of loudspeakers, I would say any of the "L" series of speakers by ADS. These would be the "L"'s with the butyl rubber surrounds and bronze mesh grills. IMO these were the best I heard back in the day.
In fact, while waiting for a new replacement driver for one of my Viennas, I used a near mint pair of ADS L-520's for awhile in my system recently and was still amazed at how they sound.
But having had HiFi systems since the mid 70's and hearing a lot of loudspeakers, I would say any of the "L" series of speakers by ADS. These would be the "L"'s with the butyl rubber surrounds and bronze mesh grills. IMO these were the best I heard back in the day.
In fact, while waiting for a new replacement driver for one of my Viennas, I used a near mint pair of ADS L-520's for awhile in my system recently and was still amazed at how they sound.