Mine might have said reference 4. I did not have them for long and don't remeber RS 4 or reference four, but I know there was a 4 in there! I picked them. up re-foamed them and sold them. I have several pairs of various Infinity speakers, but there was something about them I didn't like. Actually, I'm partial to two way speakers and not three ways. 99% of my speakers, and I own 20 pair or so are two ways. I'm probably the odd man out, but I like the lows and highs to be emphasised, and the mids to be somewhat flat. I'm just weird!