Harman (ok...Levinson) doesn't even spec the 532 into 4/2 ohms. That's really a departure for a company with the type of history that ML has. It's also $20K, which is a heckuva jump from the 432 - which looks to have nice build quality, large toroids, etc. I'm not making a judgement on the 532 as I have not heard it, but IMHO if it takes less (expensive) parts to make comparable products as time marches on - great - but the price should be going in the opposite direction.