A point could be made that they don't generally need to be as good. The designer of the monitor don't have to worry about the amp he choses to be used with all kind of speakers, with all kind of impedances curves, all kind of sensitivity. He has full control on the gain structure and how volume control is implemented.. He have to choose the amp that has the single job than to push one single Driver, that is limited to a certain frequency range and which he knows exactly the behaviour because he measured it.Out of topic, but does anyone know sinad numbers for amps in active monitors? For some reason many manufactures are hiding them......for example yamaha hs8. Can't find it. Or neumann, genelec, adam......I assume better sinad more transparent they are.