I don't know if this was the case "back when", but nowadays the pro version does not have detachable cables. The difference is that the cable is coiled (and I t

I don't know if this was the case "back when", but nowadays the pro version does not have detachable cables. The difference is that the cable is coiled (and I think a bit longer) and some parts (that do not affect the sound signature) are of slightly higher quality.