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Cypher Labs Theorem 720

Discussion in 'Portable Headphone Amps' started by drsheep, Sep 3, 2013.
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  1. Poimandres
    Does anyone have the 13's? I was wondering how it paired with them and if there was any hiss. Also is there any benefit in going balanced with the 13 or 16 fp's?
     
  2. shigzeo Contributor
    It has everything to do with how sensitive you are and your gear is to hiss. Some people aren't bothered by it. That said, the JH13Pro are less sensitive than a lot of earphones. I hear hiss from them with a number of sources but they are very good at suppressing the worst of it from every amp.
     
  3. Poimandres
    I decided to go for it and ordered a theorem today from TTVJ.  Very much looking forward to it.  How does the dac compare to the clas db?
     
  4. midnightwalker
     
    Small/Acceptable hiss with 16's using single end. 
     
  5. Cotnijoe
     
    looking forward to your impressions =)
     
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  6. Ultrainferno
     
    It's the same DAC as the db and R, it's different from the original solo
     
  7. Poimandres
    Thanks, I knew it was the same dac I was wondering how the theorem dac sq compared to the db. I may be wrong but I thought that the implementations were different.
     
  8. shigzeo Contributor
    They are both top notch in their fields. Theorem relies on another output source, so the two (as independent units) can perform differently. I've found the Theorem's output to outperform most amps out there, so it is truly mated to a great output. You'd have to spend a lot more on an analogue output system for the dB to reach the same level. 
     
  9. Poimandres
    Thanks. Does the dac in the theorem get power from the internal battery and not externally from usb?
     
  10. Ultrainferno
    Correct, it's not USB powered
     
  11. rmilewsk
    The 720 hissed with the JH 13 pro's for me. See my review earlier in this thread.
     
  12. shigzeo Contributor
    It's not a for your or for her thing: every source hisses. It is outed by sensitive output devices. Some people are not bothered by it. Amazingly, some people get on with the likes of the AMP3Pro. The Theorem is of course a lot less hissy but as you said, it makes noise. Fortunately it is neutral noise and totally liveable. 
     
  13. fiascogarcia
     
    Shigzeo,
    What do you mean by neutral noise?  Thanks.
     
  14. rmilewsk
    The hiss was not from the source but from the Theorem 720 as I verified by trying the exact same setup on another amp without any hiss. I was bothered by the hiss.The hiss was neither neutral nor livable for me. Which is why I sent the 720 back.
     
  15. shigzeo Contributor
    I'm sorry, I was vague. I meant that the noise has no peaks or troughs; as long as your batteries are charged, it is a constant volume that doesn't change on cable wiggles or the volume of the music played from the source. It is exactly the sort of noise that you want- if you have to have it. My Walkmans and AMP3Pro not to mention one or two other amps, have noise that modulates even when you are not touching the chassis or twiddling the volume pot. Those non-neutral noise signatures are annoying.
     
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