New, 10' Double Helix Cable, headphone cables (Sennheiser HD-650 headphones) have arrived and here's my first impressions.   Flat, neutral, not as bright, loudness attenuated by 1-2db.   ???   That said, my reference piece is K.D.Lang: "Hallelujah."   Lot's of piano chords, bass kick drum, subtle cymbals and an incredibly wide ranging voice.   I had to crank the volume an additional +2db to allow for the attenuation and switched out the cables a half-dozen times or so for what I considered a fair listening secession.  Even checked...