The Blue RCA is Tellurium’s entry level RCA given 4.5 stars
for sound quality by HiFi Choice in 2012 because they had designed it
specifically to work with Blue speaker cable, not as a stand alone product. Tellurium
viewed it as a failure on their part, so they put significant time and
resources into developing the Blue RCA further and the new version leaves the
old Blue in its wake in terms of performance.