I still have a pair of ADS L1290ii that I used for a couple of years. I used a MINIDSP to biamp them driving them with a total of 350 Watts per channel while they sounded OK I could never get the sound out of them that I liked. My other system used Dahlquist DQ12s and dynaco tube amps and I preferred the open baffle sound opposed to the sealed boxes even though the ADs had much better bass. I have replaced the ADS with SpeakerLab corner horns and a SET amp. I prefer this to any of my other systems.
It may be the amplifiers which are the same vintage as the speakers (Luxman and SAE) but I just couldn't make it work for me.
The ADS are going up for sale.