Very interesting. I've been using the Music Reference Pot-in-the-Box today (just got it) with the CAT JL2 and it blew me away how good this thing sounded in absolute terms, and ridiculous for $135. I've got the RM9 MKII coming next week and am eager to try it with the passive; I did not get a chance to try it with the RM10 MKII which I just sold this week, a very sweet 35 watts. I know me, and if this passive works wonders with the RM 9, I'm going to start thinking about stepped attenuators, transformer/autoformers....