One of the things I love about the HD650 is its ability to properly reproduce 3D holographic imaging with respect to binaural recordings. I'm curious to hear a headphone that does a better job and wonder how the HD800 performs in this regard. One of my favourite listening experience with the 650 is listening to binaural recordings of thunder, rain, or field recordings of large spaces - you close your eyes and are transported.
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I have tried HD 800 at a meet, using several source-chains, and I was about ready to buy it once. Actually the HD 800 does have a more expansive (and expensive, LOL) soundstage than the HD 600 & 650. That's one of its' main strengths, as it should be with it's price tag of 3-4x more than the 650, and being it's still Sennheiser's top-tier headphone. It's other main strength is all in the highs. It's a very analytical, revealing and treble focused headphone. But it was strange that when A/B comparing the HD 800 to the Stax SR-009 (both properly driven), the treble quality of the 800 wasn't in the same league as the 009, making the former sound a bit artificial and metallic in the highs by comparison - yet comparing the treble of the 800 to most other headphones under $2,000 the 800 still leads the way in 3D soundstage and treble. I chose however not to buy it because it's somewhat too analytical and bass-shy for me.
I find that
interesting that somebody else on head-fi enjoys listening to something other than music with their hi-fi gear. For me personally, only about 40% of what I listen to is what is known as "music". The other great deal of what I enjoy listening to on a day-to-day basis is
experimental noise. Many vast permutations / combinations of drone, power ambient, field recordings, musique concrete and sound effects in general. I started recording sound effects at around age 5 and now am a sound-design artist (but that's a whole other story). In general I would like to point out that it doesn't have to be "music" to satisfy your ears.
Music in general follows standard formulas of rhythm, melody, chorus, beats / bars, etc., whereas abstract noise can implement sounds from any source, for any length and with any combinations of layering and modifications of any sounds, without having to follow the constraints of popular rhythms and vocals, etc. - allowing a more free flow of thought and excursion. Anyway without getting too deep into the sources where you can enjoy these sonic abstractions, some of the best ones that come to mind are:
* Rare Frequency on WZBC
* Genetic Memory on KTRU
* The Bene Gesserit Beatbox with Muad dib on KFJC
* Under the experimental and minimal categories of Free Music Archive
(With the exception of the last one, these are all weekly commercial-free college radio shows that can be streamed / stream-ripped or downloaded as a podcast). The 650's seem to give a pretty immersive experience with noize as well.