I am totally NOT surprised. Grado customer service is lacking. Their information machine in general is bad. For example, the paperwork that comes with these cartridges is just the old Prestige1 paperwork, so it's wrong. The resistance readings, for one, are different. The listed reading in the spec sheet is 475 ohms, but the cartridge reads about 680 ohms, which is probably the most major change/difference of the two series. Secondly, Grado gives out the same paperwork for all models. I have a Green1, Blue1, Gold and now Black2 for which I have original spec paperwork. The paperwork specs are all the same despite them all having differing specs when found online.