I got both the RX1 and the BK's last week. To me, and all of this is subjective: RX1 is decent -- tight bass, not overwhelming, good resolution, good soundstage, clear. However, I find the mids a bit thin and 'tinny', and so I EQ them to sound richer. The BKs: another league all together in air between the instruments and richer mids; cohesive yet large soundstage. But, I found it to be VERY BRIGHT. Yikes, peaky at between 7-10 khz -- still the highs are sweet!. Yep, I eq these as well (thankfully I bought them for my work and not for portable use). I use thick and think foam covers, plus the eq to tame the brightness. But I love the sweetness, the separation of instruments yet cohesiveness. Bass is there, but not too deep nor too overwhelming, like the RX1. With the covers and the EQ, I am very very pleased with the BKs.