Hi there - I have Devialet 800 and wonder if anyone knows if it works well with the Vandy powered sub models (e.g. Model 5a carbon, Quattro Wood CT)? What does the 5a do better than the Quattro Wood CT and what does the 5a do worse than the Seven Mk II? I mostly listen to vocals, orchestra, violin, piano and from time to time pop. Thanks a lot, everyone.