Passive Volume Control for DACs/Sources

Discussion in 'Digital: DACs, USB converters, decrapifiers' started by Madaboutaudio, Dec 20, 2015.

  1. westermac

    westermac Friend

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    He's got a fever - and the only prescription is more Nobsound.

    Curious to see what @atomicbob digs up on their box as well, though I've happy with the Mackie Big Knob Passive. Channel imbalance is only present for the first few degrees of rotation, then disappears altogether by the 7:30-8 o'clock position. 2x2 balanced I/O. Its knob is big. It sounds like whatever I plug into it.

    Only potential downside is its use of 1/4in TRS jacks as opposed to XLR, which is a less common connection method in hifi world. Or the feeling of inadequacy that comes with not owning a preamp with wood trim or that spells messages with its heatsinks.
     
    Last edited: Jan 9, 2019
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  2. skem

    skem Friend

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    I once bought a Nobsound [edit: passive volume control]. It was the biggest piece of shit. Definitely the worst piece of audio gear I’ve ever laid my hands on. Pot was all scratchy and very uneven. Case lets in noise. Sounded like ass.
     
    Last edited: Jan 9, 2019
  3. JustAnotherRando

    JustAnotherRando My other bike is a Ferrari

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    I've randomly come across Nobsound whilst wandering around Hong Kong. It's usually in computer or electronic malls, and connected to cheap gear pumping out the kind of syrupy, smoothed-over sound that seems big out here. Maybe they've got a really diverse product line that includes some high quality stuff, but from my wanderings, it has struck me as exactly the kind of gear I would never buy myself.
     
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  4. Ozarktom

    Ozarktom Nobsound Fever

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  5. Ozarktom

    Ozarktom Nobsound Fever

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  6. msommers

    msommers High on Epipens

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    Someone please put this gentleman on a ban. Or an ignore function.
     
  7. Psalmanazar

    Psalmanazar Non Voting Friend

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  8. Ozarktom

    Ozarktom Nobsound Fever

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    No worries, I will put myself on ban. I came here to learn about passives. I am sorry I upset the apple cart.
     
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  9. OJneg

    OJneg The Most Insufferable

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    I admire your moxy. Shitposting in the face of all odds.

    That being said, if you are truly interested in learning about passives, maybe just buy up all the stuff you are posting and report back to us.
     
  10. Armaegis

    Armaegis Friend

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    My ears are agnostic. I only listen to sine sweeps and infrasonic whale humping.
     
  11. Psalmanazar

    Psalmanazar Non Voting Friend

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  12. purr1n

    purr1n Finding his inner redneck

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    I'll offer $300 for the Turtle to ship to @LetMeBeFrank for destruction.
     
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  13. Armaegis

    Armaegis Friend

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  14. LetMeBeFrank

    LetMeBeFrank Won't tell anyone my name is actually Francis

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    I have a few ideas...

    [​IMG]
     
  15. OJneg

    OJneg The Most Insufferable

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    *screeches in Californian*
     
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  16. atomicbob

    atomicbob dScope Yoda

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  17. Thenewerguy009

    Thenewerguy009 Friend

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    Hope no one minds me asking, but what's wrong with just music player controlling the volume like foobar?

    I'm doing that now & it seems to be working fine.
    Adding any component, no matter how transparent, to the power amp would slightly alter the sound right?
     
  18. Collusion

    Collusion Almost "Made"

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    You are wasting bit depth. Depending on how compressed your music is and what is the original bit depth, you may or may not start hearing reduced dynamics and raised noise floor.

    If you want to visualise this, turn down the contrast setting on your monitor. Like the brightness setting this one too will lower the overall brightness, but now you will notice colors turning out to be less vibrant and closer to each other, like there is a gray mist over the picture.
     
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  19. ultrabike

    ultrabike Measurbator - Admin

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    Either way things will not be fully transparent. SNR will decrease as the volume is decreased when using the pot or when using foobar.

    Again, and as mentioned before, make sure you are operating well with in the gain structure of your system.

    If you have no pot, but you have to reduce the volume with foobar quite a bit, you may indeed loose more bits that you want, and indeed you will pay an SNR penalty. If not, then life is good pot or no pot.
     
    Last edited: Jan 12, 2019 at 5:17 PM
  20. Psalmanazar

    Psalmanazar Non Voting Friend

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    If your playback program, daw, os, or drivers themselves crash and your DAC clips the input stage of your amp, which may or may not have adequate protection circuity, your tweeters can fry. Powered monitors usually have limiters that will engage should the signal or thermals get too hot.
     
    Last edited: Jan 12, 2019 at 7:45 PM

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