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ASUS Launches Essence III Preamplifier, USB DAC and Headphone Amplifier

Discussion in 'News' started by Cristian_25H, Oct 16, 2013.

  1. Frederik S Staff

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    ASUS did a good job with the design of the Essence One and if this new design indeed features those op-amps and a step attenuator it will be very very interesting.

    Now all we need is the price!
     
    10 Year Member at TPU
  2. 1d10t

    1d10t

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    Welcome aboard to TPU :)
    So Asus decided to dump NE 5532 and switch to AD827.It appears Asus try to address some harsh sound over the previous Essence.
    AD797 :eek:
    One of the rarest and the best opamp out there...is it AD 797 BRZ or AD 797 ANZ?
     
  3. BachAudioDK New Member

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    Thank you!

    Well the AD1955 eval board uses the PDIP version of AD797, so I think it must be the ANZ version. See attached picture.

    I think the AD827SQ would be better as I/V converter opamp due to the much faster settling time and larger slewrate (300V/us vs. 20 V/us of AD797 vs. 9V/us of NE5532)

    I would say that my personal choice for I/V would be a passiv resistor I/V stage.
    On both my Essence One and Essence STX soundcard I have replaced the I/V opamp with passive resistor I/V with negative current bias to V- so the Vout is centered to approx zero volt. This gives a very pleasant and airy treble in my ears. Very close to my analog LP setup.

    I would recommend you to read Nelson PassĀ“s thoughts on using Opamps as I/V converter, vs. discreet I/V.

    https://www.passdiy.com/gallery/other/zen-i-v-converter

    Im a bit concerned that the Essence III would cost a lot more that I can afford at the moment :eek: and I hate to sell my Essence I to upgrade ;) (you can never get too many amplfiers :roll: )

    EvalKitAD1955.jpg
     
  4. Random Murderer

    Random Murderer The Anti-Midas

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    Agreed.
     
  5. gungstar

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    please share details about this mod: photos, parts you used
     

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