You mean besides the cost, the additional connection, and the loss of balanced in a component whose whole reason for being is being balanced? No. Not a one.
RCA to XLR Adapter
I have a Herron pre amp that has only RCA outputs. I'm considering buying a pair of used Merrill Audio Veritas Monoblocks that only have XLR inputs. I found these
Cardas female RCA to male XLR adapters that would allow me to make the connection. Are there any downsides to using adapters such as these?