Still have my ADS L520 in my bedroom and use them almost every night. I still put their bass extension, imaging, and ability to play at lower volumes but still sound FULL up against any speaker south of $1000 today. Loved that they used crossover components that were good and don't change in electrical value. Just great speakers. Yeah, they only take about 50W, and maybe they won't blow you out of a large room, but for what they are, I love them.
Who uses ADS Speakers
I worked at ADS in The late 70s and Find they are one of the best home speakers ever.
I always loved their accuracy.