Reference Amp recommendations

Discussion in 'Advice Threads' started by rhythmdevils, Sep 13, 2021.

  1. Azimuth

    Azimuth FKA rtaylor76, Friend

    Friend
    Joined:
    Nov 9, 2015
    Likes Received:
    4,202
    Trophy Points:
    113
    Location:
    Nashville, TN
    Home Page:
    My bad then. In what way would you say it is not neutral?

    In just in my past experience most iFi stuff sounding fairly neutral, but maybe this Zen stuff is not in the same vein as their previous stuff.
     
  2. purr1n

    purr1n Super Friend

    Staff Member Friend BWC
    Joined:
    Sep 24, 2015
    Likes Received:
    77,540
    Trophy Points:
    113
    Location:
    Padre Island CC TX
    How much gain did you set your WHAMMY to?
     
  3. Beefy

    Beefy Almost "Made"

    Joined:
    Apr 10, 2021
    Likes Received:
    727
    Trophy Points:
    93
    Location:
    Canada
    Single board builds are convenient, but proximity of the mains transformer is always going to be an issue with the WHAMMY. When I was using an unshielded transformer in close proximity to my M3, I had a little hiss that was easy to detect with sensitive phones and IEMs, even at 2x voltage gain. Moving to a magnetically shielded transformer, and it is now dead silent, even at a higher gain.

    I'd bet building a wallwart case and umbilical to feed low voltage AC, and removing the on-board transformer, would cut the noise entirely.
     
  4. Pancakes

    Pancakes Friend

    Friend
    Joined:
    Aug 13, 2020
    Likes Received:
    560
    Trophy Points:
    93
    Location:
    Atl
    It's the default gain. Lowering it is the next thing I'll do and possibly trying Sparkos regulators.

    I've added the C2 and C7 caps (they're optional to help with stability in some op amps) but that didn't help. All internal wiring is now shielded and I've added a copper shield around the trafo. I also have a .01uf cap to try across the op amp V+ and V- per this Burson tech note https://www.bursonaudio.com/burson-ss-opamp-101-part-1-mkp-cap-tweak/
     
  5. Pancakes

    Pancakes Friend

    Friend
    Joined:
    Aug 13, 2020
    Likes Received:
    560
    Trophy Points:
    93
    Location:
    Atl
    Thanks @Beefy I'll try that.
     
  6. Beefy

    Beefy Almost "Made"

    Joined:
    Apr 10, 2021
    Likes Received:
    727
    Trophy Points:
    93
    Location:
    Canada
    Copper shielding is great for radio interference, but not magnetic. Try and find something iron-based to cover the transformer, that will tell you whether magnetic interference is an issue, and whether moving the transformer will help.
     
    • Like / Agree Like / Agree x 1
    • List
  7. rhythmdevils

    rhythmdevils Best SBAF member of all time

    Friend Staff Member Gearmaster
    Joined:
    Apr 15, 2020
    Likes Received:
    5,741
    Trophy Points:
    113
    Location:
    Bay Area
    Well I took a chance on the Monoprice Liquid Gold X and it is exactly what I wanted. I just thought I would update this thread since you all were kind enough to offer so much advice. I'm pretty sure the LauX is exactly what I was looking for and will serve me well. I just wish I could own one of the original Cavalli made ones.

    My review of the amp can be found here
     
  8. Azimuth

    Azimuth FKA rtaylor76, Friend

    Friend
    Joined:
    Nov 9, 2015
    Likes Received:
    4,202
    Trophy Points:
    113
    Location:
    Nashville, TN
    Home Page:
    The original Cavalli made ones would cost way more and be harder to repair if something went wrong. At least you have 5 year warranty. My beef with these is just like the LP...the volume pot. At least the power supply is easily replaceable.
     
  9. Ruprit

    Ruprit Rando

    Joined:
    Sep 14, 2021
    Likes Received:
    11
    Trophy Points:
    3
    Location:
    MA, USA
    I wonder if there is enough room to mod in a small, but higher quality, volume pot? Something like a TKD stepped pot. I know they make one that's pretty small. Granted, I know it would be easier said than done
     

Share This Page