He claims that the only way to get real piano sound is to use headphones because crossover does similar thing.
You can use active speakers to eliminate that issue, which John Siau should be aware of. One of his customers bought 7 Benchmark DAC1's for his studio and uses them with active type speakers.
FWIW: I agree with Doug that the sound of a given transport with built in DAC may be preferred to a jitter immune DAC (and vice versa) - but that is not what I meant. Sorry but I may not have ben clear enough.