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Oppo HA-1 Impressions Thread

Discussion in 'Headphone Amps (full-size)' started by aamefford, May 7, 2014.
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  1. docBliny
     
    Personally, I've noticed more details on high gain, but have then realized it's purely because the volume is louder unless I pull out the decibel meter and level match. I prefer to stick to normal/low gain with the HD800s to remove the unnecessary gain and keep the noise floor down (whether perceived or not). Going over 50% with with balanced is too loud for me.
     
    //TB
     
    zilch0md and Smarty-pants like this.
  2. jonstatt
     
    In a purely analogue domain, it is better to use the lowest gain possible to optimise the noise floor. Using a balanced connection optimises the noise floor further. But whether you are at the top or bottom of the volume control is irrelevant.
     
    In the digital domain it gets more complicated because digital volume controls sometimes have issues with resolution at low volumes. But this does not apply here.
     
    zilch0md and Smarty-pants like this.
  3. Roscoeiii
    Another reason that low gain could be preferable, provided that you have enough, is that attenuators tend to at their weakest near the lowest parts of the dial. That is where you are more likely to find channel imbalances. 
     
    zilch0md likes this.
  4. mrscotchguy

    Speaking of which... Any imbalance issues with the HA-1? I got rid of my Schiit for my PS Audio GCHA due to my low volume listening habits. I've haven't read any issues so far...
     
  5. sidrpm
    Just heard that it's here and available for demo very soon (perhaps tomorrow Tuesday onwards).
     
  6. rgs9200m
    I'm just wondering if the HA-1 DAC is the basically the same as the BDP105's DAC, which sounds very nice, especially with DVDs,  but is not really too close sonically to my EMM XDS.
     
  7. x RELIC x Contributor

    Yes it's the same.

    From Oppo Digital's website:

    ....... "The same ESS 9018 Sabre32 Reference DAC and output driving stage used in OPPO audiophile Blu-ray players ensure extremely low noise and low distortion performance.".......

    Edit: Not sure if they've tweaked the implementation though.
     
  8. akhyar
    Marvellous.
    Will check their FB page for updates on the amp
     
  9. Stereolab42
     
     
    Two observations:
     
    1. Playing a zero-bit track, on my 40-ohm 1540s, there is no noticeable noise anywhere on the dial on low or high-gain. With the exception of the highest setting on high-gain, 6db, where I can barely hear some noise in an absolutely quiet room.
     
    2. Playing with various test tracks, I cannot detect a right/left-channel volume imbalance at any location on the dial, including one step up from silence (-60db).
     
    This is a sick amp for the price. The only major issue I can think of is the constant 40-watt power consumption courtesy of class A. If you are not annoyed by having to turn it on/off, or are willing to put it on a motion-detector power-strip so it goes on/off automatically when you're in the room (you can buy these on Amazon), then that's a moot point. The on/off cycles may shorten the lifetime of the unit, but this is a $1200 amp, not a $5000 amp, it doesn't have to last 20 years.
     
  10. x RELIC x Contributor

    I switch mine on/off all the time. What degree does this shorten the lifespan? Honest question.

    Btw, I'm still impressed by this amp every day, very happy with this purchase.
     
  11. Stereolab42
     
    I've seem more than a few people claim that on/off cycles on electronics tend to stress the components, but not being an EE, I can't discuss intelligently exactly why. I think relays are a factor -- I believe they are the source of many of the clicks you hear when turning a unit on/off or changing inputs. But now that I think about it, heat is also a stress on components, and the HA-1 does run hotter than most (though not nearly as hot as many *cough* tube amps *cough*). Again, at this price point, I don't think lifetime is as much of a worry as it is to those shopping nosebleed boutique brands.
     
  12. sidrpm
    It's confirmed....demo is up and ready NOW at Funan Song Bros.....do post your impressions after you have tried this bro.
     
  13. akhyar
     
    Thanks for the update bro.
    Will try to bring along my LCD-X with balanced cable this weekend to Song Bros.
     
  14. Pier Paolo
    I will be in Miami next august and I could buy the oppo there.
    Could you help me in find a retailer?
    TKS
     
  15. Smarty-pants

    Why not just but it direct from Oppo Digital in the USA and have them ship it to your residence?
    Just contact their support for details on how that works.
     
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