I own a VK3i and VK200. I'd been using the VK200 with a Blue Circle preamp with the BAT RCA to XLR adapters since March.
Before receiving the VK3i this summer Victor Khomenko advised me it would be best to run a balanced cable between them, but he also said it wasn't necessary to use balanced connections between the source and the preamp since the VK3i converted every input to balanced anyway.
I've never connected the two with an RCA cable and adapters so I can't comment on the difference, but the BAT combo sounds great connected by an XLR cable.
So in summary, from any source to BAT preamp it shouldn't matter, but from BAT pre to BAT amp people say it makes all the difference in the world.
Good luck!
Before receiving the VK3i this summer Victor Khomenko advised me it would be best to run a balanced cable between them, but he also said it wasn't necessary to use balanced connections between the source and the preamp since the VK3i converted every input to balanced anyway.
I've never connected the two with an RCA cable and adapters so I can't comment on the difference, but the BAT combo sounds great connected by an XLR cable.
So in summary, from any source to BAT preamp it shouldn't matter, but from BAT pre to BAT amp people say it makes all the difference in the world.
Good luck!