Streaming upgrade from Cambridge Audio cxn v2

I have a great sounding system with ayre integrated and sonus faber serrafino speakers. The streamer/dac is by far the cheapest part of the system with the Cambridge Audio cxn v2. I’m wondering if upgrading the streamer/dac would give a step function improvement or if the cxn is already good enough and the improvements will be subtle at best. My dealer is recommending the ayre qx8 but I’ve not yet listened to it. Any thoughts for a streamer/dac that would give me a step function improvement for around $6000 new or used.?