I got my AKG K1000 from HeadRoom during their sale this past April, and I used it at first with a pair of ASL Wave monoblocks. I loved the sound, and immediately stopped using the Sennheiser HD600 and Grado SR325s that I previously used. Since then I've considerably upgraded my system; i.e., I now use an ASL AQ-1005DT amplifier, which I equipped with super high quality tubes, and a Marantz SA8260 SACD player. The sound of the K1000 is even more fabulous now, and it's the only headphone that I use in my main system. For added base I sometimes use a nearby powered subwoofer, although it really seems unnecessary because I get lots of base from the K1000. All in all, I highly recommed the K1000, because it's absolutely wonderful.