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NEW Vali Schiit AMP!!!

Discussion in 'Headphone Amps (full-size)' started by lff, Oct 9, 2013.
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  1. Mshenay
    meh 6.5 ohms... maybe. My AUdio Technica W1000x is 42oms... so that's about 7x as much as the output of the Vali... should be 8 or the out put of the amp should be 1/8 of the headphones in put...
     
    Oh wait nvm I'm going to use a 75ohm INteconnect between the Headphone and the amp, that should solve any mis match issues
     
    for a low impedance headphone I'd get ur sef like a $20 impedance adapter. A few reputable sellers are on ebay or the DIY guys might be able to build you one as well.
     
  2. SMG52
    Impedance adapter....? Link please...[​IMG]
     
  3. Mshenay
  4. MickeyVee
    So, basically your asking for a Bifrost Uber with Gen 2 USB only on a Modi package.. Would be a perfect match for the Vali.  I'm in!!
     
    Quote:
     
  5. FLguy
     
    Well, I understand that this (impedance adapters) may be a bit of a controversial topic, but those considering use of an impedance adapter may be interested in this thread:
     
              Impedance Adapters/Cables | Explained & Listed:
              http://www.head-fi.org/t/601669/impedance-adapters-cables-explained-listed
     
    I noticed that there is discussion of the possibility of damage to some amplifiers.  I'm not smart enough to know whether that's real or not, and if it is, with which amps it would or could apply.  Maybe someone(s) more knowledgeable than me will clarify whether this would or could apply to the Vali or not...
     
    JoeKickass likes this.
  6. Mshenay
    Good point, wonder if Schiit could make some kind of adapter to reduce the gain of the Vali. 
     
  7. manbear
    If you're interested in impedance adapters, there's a good discussion going on in the speaker amps for headphones thread. Unless I'm mistaken, the "er4 p to s" type adapters have resistors in series, hence they will affect the damping factor of dynamic headphones. Mind you, this doesn't necessarily matter that much. While they can change the frequency response of a dynamic headphone, the change might not sound objectionable. I have one of these adapters in 300 ohms, and I thought it sounded great with my Q701 and Emotiva Mini-x speaker amp. However, planar headphones are immune to this changing damping factor effect, so they work great for planars.
     
    If you don't want to affect damping factor on dynamic headphones, you will need to get more complicated with a multi-resistor network. This will allow you to present a suitably low impedance to the headphones. 

    Also, you can find the max output power into your headphones with a single series resistor in each channel (e.g. the er4 p to s type adapter) using the formula (((max amp voltage)*(headphone impedance)) / (adapter impedance + headphone impedance))^2  / (headphone impedance). Check out the speaker amps thread for more formulas, like for decibel attenuation.

    You can also get RCA attenuators on the amp's inputs. I'm not sure how these affect the sound in regards to the input impedance of the amp and the output impedance of your source, but it doesn't seem like they would affect the damping factor of the headphones.
     
  8. leesure

    The Vali will drive the Audeze cans nicely, but it's underpowered fir the HifiMan offerings.
     
  9. TMRaven
     
    What does this distortion sound like to you?
     
  10. JoeKickass
    I've been posting this link over and over, but head-fi already has a great thread on balanced attenuation and making attenuating adapters:
    http://www.head-fi.org/t/198828/the-hissbuster-for-sensitive-headphones
     
    And it has listed combinations of resistors for attenuating the signal without changing the impedance that the amp and headphones "see" so there should be zero risk to the equipment involved. I don't think you can just throw a 75 ohm resistor in line with the signal and call it a day like the one on ebay...
     
  11. hmorneau
    "When an amplifier is pushed to create a signal with more power than its power supply can produce, it will amplify the signal only up to its maximum capacity, at which point the signal can be amplified no further. As the signal simply "cuts" or "clips" at the maximum capacity of the amplifier, the signal is said to be "clipping". The extra signal which is beyond the capability of the amplifier is simply cut off, resulting in a sine wave becoming a distorted square-wave-type waveform."
     
    I think it sum up what I mean by distortion, in fact it's more "clipping" according to wikipedia.
     
  12. SMG52
    Any experience in how much background 'noise' (gain hiss or whatever) there is when driving the low impedance, efficient LCD-X headphones?
     
  13. purrin
     
    LOL. Just one (of the two) power transformers in the Mojo probably weights 5x the weight of the Vali.
     
    oswalakhil likes this.
  14. purrin
     
    I didn't hear any noise. But it didn't seem like a good match. LCD-X was lethargic from Vali. Figure 8 ohms output Z and 22 ohms nominal Z of LCD-X getting too close for comfort. I had better results from a portable with low output Z, i.e. UHA-6S.
     
  15. wes008
    But what does it sound like to YOU?  We all know what clipping technically is.  We want to know how the Vali sonically performs with the T1.
     
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