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output dynamics management

Discussion in 'Amps and Cabs [BG]' started by johnsonabq, Dec 29, 2017.


  1. johnsonabq

    johnsonabq Watch out where the huskies go... Supporting Member

    Dec 12, 2011
    Albuquerque, NM
    Looking at the block diagram for my MB Subway D-800+ I see something called "Output Dynamics Management". Can someone explain exactly what this is? Is it some sort of compression? Thoughts? thx

    MB-output.jpg
     
  2. /\/\3phist0

    /\/\3phist0 ( ͡° ͜ʖ ͡°) mmm Woody! Supporting Member

  3. two fingers

    two fingers Opinionated blowhard. But not mad about it. Gold Supporting Member

    Feb 7, 2005
    Eastern NC USA
    Yup. @johnsonabq one of Mesa's design engineers is our own @agedhorse ..... kind of a handy guy to have around in more ways than you can imagine. He can't camp out here all day. But he swings by often. He should be able to clear this up for you.
     
  4. two fingers

    two fingers Opinionated blowhard. But not mad about it. Gold Supporting Member

    Feb 7, 2005
    Eastern NC USA
    It looks like a simple switch going to ground. Possibly a bleed resistor that changes the impedance? That's just my own spitballing. Pure speculation on my part.
     
  5. agedhorse

    agedhorse Supporting Member Commercial User

    Feb 12, 2006
    Davis, CA (USA)
    Development Engineer-Mesa, Product Support-Genz Benz
    There is circuitry that senses as the power amp is getting close to rated power. As the power amp gets close to the beginning of saturation, this circuit block emulates the various ways the signal might behave if the class D amp was in fact a tube power amp. This includes gain droop, distortion harmonics, symmetry and recovery without the pumping and spongy feel normally associated with traditional VCA's, LDR's or FET gain cells. The 2 ohm switch simply re-scales the circuit.
     
  6. BassmanPaul

    BassmanPaul Inactive

    You heard it right from the Horse’s mouth! He did design the amp after all. :D
     
  7. johnsonabq

    johnsonabq Watch out where the huskies go... Supporting Member

    Dec 12, 2011
    Albuquerque, NM
    Thanks for the quick reply. It sounds like the Advanced Power Management that TC Electronics uses. Or is that a different beast?

    PS... I find that 2 ohm switch to be very handy.
     
  8. agedhorse

    agedhorse Supporting Member Commercial User

    Feb 12, 2006
    Davis, CA (USA)
    Development Engineer-Mesa, Product Support-Genz Benz
    TC's take is quite different, and their's is done in DSP.

    The Subway's management is all analog, and transparent until reaching rated power.

    There are many different ways to skin this cat, different solutions for different players.
     
    AstroSonic, Passinwind and johnsonabq like this.
  9. johnsonabq

    johnsonabq Watch out where the huskies go... Supporting Member

    Dec 12, 2011
    Albuquerque, NM
    Thank you sir.
     
  10. Primary

    Primary TB Assistant

    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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