ARC LS-15 versus LS-16

Can anyone tell me the difference between the Audio Research LS-15 and LS-16. What are the sonic characteristics of each? Thanks.
From what I was told, the LS-16 has Infini caps, a removeable power cord and an HT bypass. Other than that they are the same. Some LS-15s have the cap update so sonically they should be the same. I own an LS-16 and I'm very happy with it.