Dan.m:I which to purchase a DAC to sit between my ZP90 and amplifier. The ZP90 has opitical, coax and usb outs.
No it doesn't, there's no USB connections on any Sonos Zoneplayer. There's two ethernet ports but they aren't the same thing.
Which connection do people recommend - What are the advantages of each?
Well, in theory optical won't suffer from electrical interference but coax doesn't require the two stages of electrical to optical conversion and back again that the optical connection does. I've tried both, couldn't hear any difference to be honest.
What would be a sensible amonut of money to spent on connecting cables?
Worms.
Can.
Opened.
I will probably go for a DACmagic or beresford Caiman. Do people think that this £200 well spent?
I would say so but it will depend a little on what amp you've got.
Would I also notice an improvement if i connect my Arcam alpha one CDP to either of these DAC's? Is it correct that arcam are about to bring out a DAC.
Yes they are, £300 apparently.