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Cypher Labs Theorem 720

Discussion in 'Portable Headphone Amps' started by drsheep, Sep 3, 2013.
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  1. utdeep
    I've been using a recently produced Theorem for a few hours and the hiss is unbearable.  It doesn't matter if it is a LCD-3, Shure SE846, or a NAD Viso HP-50.  I tried another Theorem from a friend with the same results.  We're both returning our products.  I just don't get it.
    I noticed a little bit of hiss with a Cypher Labs CLAS -db/Duet combo and it was't much of an issue.  This hiss is ridiculous - even worse than the ALO MK3.   Compared to the non-existent noise floors of other companies, how does any company put out a product that ruins any music with silent parts?
    A non-existent noise floor should be a minimum standard that amp manufacturers should be held to.  I understand that this is a personal preference, but all the rest of the sound seems irrelevant when I feel like there is a dang mosquito stuck in my earpad. 
  2. Ultrainferno
    There's no hiss with my LCD-2 or any other full sized can for that matter
  3. utdeep
    Are you sure?  The LCD-3 is probably less sensitive than the LCD-2, and I can even hear the noise floor on it.  It drives me nuts on the SE846.   I use the LCD-3 at medium gain but I think I prefer high gain for the increased dynamics but the hiss gets worse.
    I must be the unluckiest head-fier around!
  4. fiascogarcia
    I've been so, so interested in streamlining with one of these new dac/amp combos coming out.  But it seems right now I think I'm very happy with my CLAS/RSA and CLAS/Pure II setups, because I hear nothing in the way of hiss!  Then again, I have old ears. [​IMG]
  5. singleended58
    Go with balanced connection the hiss will be much less and bearable.
  6. fiascogarcia
    Somehow "bearable" doesn't instill a lot of confidence.
  7. utdeep
    I am all balanced with both the SE846 and the LCD3. 
    I wish they had stuck the guts of the Duet into the Theorem - it has more power for the high impedence headphones and more range for the senstive IEMs.  At any rate, I prefer the headphone out of my iPhone over this noisy amp.
  8. Ultrainferno
    have you checked back with CL?
  9. singleended58
    My Theorem does not have "loud" hiss or I might get used to it since I got Rxmk3B. :)
  10. utdeep
    I don't think I need to because my impressions match up with everything others have said.  We also tried two different Theorems.  I might just be very sensitive to it.
    Unfortunately, it's a definite deal breaker.
    If you like hiss, the RXmk3b is perfect for you.  I still liked the RX though... with the HD800.
  11. Scorpion667
    Both combinations have some copper colour. Are you referring to the top or bottom one?
  12. rudi0504

    I like all In Copper Color , not The combination Color
    Or now has Gold Color look beautiful too

  13. IceClass
    Too bad it isn't available in silver.
  14. singleended58

    Are all Theorem in colors plated with copper and gold? I thought Cypher Labs using real copper or gold but the prices seeem to be the same with black aluminum (?)
  15. catcherfly
    Has anyone tried the T-Peos H-200 or H-300 with the 720. They are not crazy sensitive IEM so I'm really hoping the noise floor will be minimal. I'll be listening with an iPhone 5s, mostly electronic music
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