I'm delighted with some new equipment that have opened up my HD650s tremendously:
— Ray Samuels RSA SR-71B (6/2013), which is claimed as the most powerful portable amp. I use balanced and unbalanced outputs, and find them both delightful. I'm literally left with nothing specific to criticize, no particular frequency range that is weak, no type of music that doesn't work beautifully. I'll say more in a dedicated thread.
— Perhaps more on topic, I now have two Cardas cables that are as transparent (and good value) as anything I've tried. One is a Cardas Clear Light with 1/8" unbalanced cable, 1 meter. It branches into two at my chest and those cables are small, just like those on the Cardas Ear Speakers (see the animation on Youtube or Cardas.com). Very easy to pack and take on the street or into waiting rooms. Also, more rugged than it looks, with a strong covering.
— The other cables is a balanced Cardas Clear (twice copper, but not the cost, of the "Light" version), 1.5 meter. It looks beautiful and handles very well. This version is a moderate improvement, but not earth-shaking... unless you have a balanced amp as I now do. I sent some of the camera-style connectors that RSA uses along with wiring diagrams to Cardas, and they are now looking at offering these on a regular basis. I hope they talk to Ray about this... a great combination.
I find with this setup, the space is more delineated, tonality is more realistic, detail is enhanced. Instead of bass, I hear drums and guitars. Instead of midrange, I hear real people singing (Amber Rubarth on Chesky), horns playing nearby in my room (Bill Berry's For Duke) or in a hall (several, including Harry James on Sheffield). Treble extension isn't something I think about... instead I hear the various orchestral and jazz percussion instruments (Exotic Dances from the Opera, Chesky). I hear finger cymballs with not only their peculiar harmonics, but the clap as air is captured between them and the slip and release of that air. I hear high-hat taps that sound different with each tap, and which make clear when the drummer lifts slightly off the pedal (Dire Straits, You and Your Friend). The cables, the amp, the D/A (Meridian... surprisingly clean and musical after break-in) all sound their best. And the HD650 are beyond what I'd heard before, except much more expensive, non-portable systems. I don't plan to buy any desktop equipment... this is now my primary system. (Music fed from iTunes library through Pure Music with oversampling enabled, on a 2007 MacBook Pro; files played are 320kbps MP3, 16/44, and up to 24/192 native through the Meridian. I stopped using any EQ at all in Pure Music... not needed).
With these, I do not miss the euphony of my beloved tube amps, and certainly am glad I got rid of my early WA6 by Woo Audio... a beautiful sound, but very little transparency into the recording, hence ultimately boring.
More later in separate threads, with pics. I'll link to them here when done.