Pedal Output Impedance

Discussion in 'Effects [BG]' started by Killens84, May 30, 2018.


  1. Killens84

    Killens84 Supporting Member

    Sep 3, 2008
    Mississippi
    I recently bought a Way Huge Pork Loin, and just saw in the manual where it says the output impedance is < 25k ohms. That’s quite a bit higher than most other high-quality pedals I’ve seen. That makes me a little worried about high-end loss when the pedal is active, since I run a 15-20 foot cable to my amp after my pedalboard. Is the output impedance in the manual accurate, is it a typo, or am I reading that wrong? Here’s the link to the manual...
    https://vidweb.aws.marketlive.com/jimdunlop_vid/text/content/pdp/manuals/WHE201.pdf
     
    Last edited: May 31, 2018
  2. I have the Pork Loin. I'm not really tech savvy enough to say if the output impedance is correct. However, to my ears, the Pork Loin sounds fantastic with a bass guitar. I don't notice any high end loss at all. Of course, you may find otherwise. Let me know what you find out.
     
    Killens84 likes this.
  3. Killens84

    Killens84 Supporting Member

    Sep 3, 2008
    Mississippi
    Anyone? Just curious if the Pork Loin output impedance is actually that high.
     
  4. jw23mind

    jw23mind Supporting Member

    Jan 16, 2017
    Reading MA
    Yes it is, at the midpoint of the volume control. At either end, the impedance drops (down to a couple hundred ohms at full volume). This is because it uses a 100k volume pot, like a big muff. At midpoint you have a voltage divider of 50k in parallel with 50k, yeilding 25k output impedance.
     
    jwr and boomertech like this.
  5. Killens84

    Killens84 Supporting Member

    Sep 3, 2008
    Mississippi
    Wow, that’s interesting. So as long as my volume control is in the lower or higher end of its range, the output impedance will be low? I think my volume knob is only around 8:00 or so. It’s pretty low, because that’s where I achieve unity gain. Maybe 9:00 at the most.
     
  6. boomertech

    boomertech Frank Appleton Commercial User

    Apr 8, 2009
    Syracuse, NY
    Designer/Owner of FEA Labs
    Very good!:thumbsup:

    It's worth noting that placing the level pot at the output is fairly common with a lot of pedals. The output pot on the Pork Loin can be changed to a 5K or 10K for lower output impedance, because the output opamp (LM833n) can drive 2K loads without difficulty.

    -Frank
     
  7. JKos

    JKos Supporting Member

    Oct 26, 2010
    Torrance, CA
    Yep. And, even your bass.

    To the OP... Don't overthink it! If it sounds good, it is good!

    - John
     
    Last edited: Jun 4, 2018
  8. Killens84

    Killens84 Supporting Member

    Sep 3, 2008
    Mississippi
    Thanks for all the input. I ended up ordering a TC Electronic Bonafide buffer to put after the Pork Loin, which is at the end of my signal chain. It’s 1 meg input, and 100 ohms output. That’ll give me peace of mind, if I’m plugging into a passive DI or running a long cable to my amp. It was probably ok without the buffer, but my analytical side likes for the numbers to look good.
     
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    Here are some related products that TB members are talking about. Clicking on a product will take you to TB’s partner, Primary, where you can find links to TB discussions about these products.

     
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