It sounds like its coming from the BB, and goes away a bit after 30 mins riding. It's most likely exaggerated by the frame being carbon and sounds like a bag of spanners for those first 30 mins.
However the BB "feels" as smooth as silk. Wheels are fine, cassette is on tight and the whole bike is 6 months old/done 3000k approx. Only makes a noise when under normal load and the wheels are actually turning.
It's an OEM FSA Gossemer BB30 fwiw...