Tarquinh:
On the other hand a macmini plus DAC is a lot cheaper.
Also, it has a clumsy interface, and I'm not sure how easy it would be to replace the drives when they fail.
Sound-wise it will be different from your Marantz. Whether it will make your system "sing" depends what you mean by that. Given your other thread, I'm not so sure.
I have been wondering that because im not sure it will alter the woes i mentioned in my other thread as you said. It wont change the inherent character of the amp but it would probably allow it to work at its best which is what i meant by sing. Not sure about the macmini thing because i dont think any amount of dacs ( not even a naim nDAC) would change the mac into an audiophile grade component, but its an interesting point about the dac route. This is why i asked for all opinions so many thanks.