I have just hooked up my brand new Hypex As.2.100D Class D amplifier to my vintage 70s Tandberg TL3520s. I use the TL3520s as "Mains" or "music appreciation speakers" in my studio workspace. They are excellent on revealing poor compression and harsh mixes. I run a digital SPDIF signal from my RME FF800 to the as2.100D which powers both speakers. A totally noiseless system when running Idle. Actually less hiss than on my Neumann KH120s! I need to find some casing for the amp before I take some pictures. But here are a few picture of the speakers and amp in question.