3) Jensen Transformer with their cables which are Canares Star Quad.Hi Jim,
First, to be sure it’s clear you can use any cable brand with the Jensen transformer. And you needn’t use the same brand for the RCA cables and the XLR cables, for that matter. The particular seller of Jensen transformers I suggested just happens to also sell many Canare cables.
I would strongly suspect that the Jensen transformer option will make the most difference, among the options you listed. And I would expect it to be more likely than not that the difference will be in the right direction, from a subjective standpoint. It is also conceivable, though, that the difference may be in the wrong direction, subjectively. But if that were to occur I would interpret it to mean that the root cause of the problem is elsewhere in the system. As I said earlier, a Jensen transformer, which would provide the BAT amp with a true balanced pair of signals, is IMO the right way to implement this kind of interface, at least within anything close to the price range you are considering.
Good luck. Regards,
-- Al