Actually I have used my MT12A with The less expensive Energy C50's which are also rated at 89DB sensitivity to good effect (However, I felt that they were not the ideal match with my sub). Again as in your case this is a bedroom system and thus tends to get a lot of use primarily at low to moderate volume levels but I have cranked it a couple of times with the ELS3's (only 87DB sens and 4 ohm impedance usually not ideal for tubes)and was pleased with the sound. I am a big fan of EL84 amps (I own 3 at the moment)as they offer great sound and I feel the best midrange of any of the PP designs and are reasonable to re-tube. My MT12A actually replaced a Single ended ASL MG SI 15 DT integrated amp. The remote works well and as I mentioned earlier also operates the matching CD and Tuner if you so desire.
Good Luck, Jerry