Since most -if not all- sources (e.g. DAC, CD player, phono stage) have an output voltage, that's capable of driving a power amp, then what's the purpose of an active preamp?

Doesn't a passive attenuator seem like a simpler, less intrusive and 'cleaner' solution of controlling volume, instead of an active preamp?

In my particular case, I have a Croft Micro 25RSLS (line stage only preamp), a pair of Croft Series7R monoblocks and Harbeth speakers. Should I consider replacing my preamp with a passive attenuator, such as the Goldpoint SA4M?

Thanks,
Panos