geworthomd
Im not following your question, a Threshold amp “VS” a Cambridge CD player? What are you looking for? The 851C is a great CD player for the money. Can’t think what 851 Series amp that has a DAC and my guess is others above are thinking you are comparing a Threshold to a Cambridge amp? Build quality of the 851 Series is very good and I question those that doubt it have seen or owned one.
if you’re simply looking for a nice amp that is reasonably priced then look at a Parasound P21+. Knew a guy that had a S/500 but it’s been too many years to recall how it sounded but I bet the P21+ will easily hold its own no problem. A used ModWright amp would be another to visit, as on the used market they are a great value.