Amplifier porn

Discussion in 'Power Amps' started by 9suns, Jan 24, 2018.

  1. AdvanTech

    AdvanTech Friend

    Pyrate BWC
    Joined:
    May 13, 2016
    Likes Received:
    1,667
    Trophy Points:
    93
    Location:
    NYC
    I'd be so happy with 40lbs. Mine is 90 and I don't know how I could have unboxed and got it into place without years of deadlifting.
     
  2. yotacowboy

    yotacowboy McRibs Kind of Guy

    Pyrate Contributor
    Joined:
    Feb 23, 2016
    Likes Received:
    10,682
    Trophy Points:
    113
    Location:
    NOVA
    Home Page:
    Yo dawg, I heard you like heatsinks, so I put heatsinks in your heatsinks!
     
    • Like Like x 3
    • Epic Epic x 2
    • List
  3. Armaegis

    Armaegis Friend

    Pyrate BWC
    Joined:
    Sep 27, 2015
    Likes Received:
    7,461
    Trophy Points:
    113
    Location:
    Winnipeg
    I just grabbed this pic of the XA30.8 from 6moons...

    [​IMG]

    I'll bet that's 60 lbs of transformer right there.
     
  4. Cspirou

    Cspirou They call me Sparky

    Pyrate
    Joined:
    Sep 27, 2015
    Likes Received:
    8,200
    Trophy Points:
    113
    Location:
    Northwest France
    Must have a high pound per watt ratio
     
  5. Armaegis

    Armaegis Friend

    Pyrate BWC
    Joined:
    Sep 27, 2015
    Likes Received:
    7,461
    Trophy Points:
    113
    Location:
    Winnipeg
    In the absence of other metrics, weight isn't a terrible spec to gauge an amp by.
     
    • Like Like x 6
    • Epic Epic x 2
    • List
  6. Armaegis

    Armaegis Friend

    Pyrate BWC
    Joined:
    Sep 27, 2015
    Likes Received:
    7,461
    Trophy Points:
    113
    Location:
    Winnipeg
    I am proposing this as a new metric to replace SINAD... kilogram per watt (because I refuse to mix imperial units with metric)
    which technically works out to something weird like seconds cubed per meter squared, but I digress.

    Starting with the SPL s800 and Benchmark AHB2 which were my two amps, then I added the Pass, Yamaha, and Ragnarok. Took the ratio to a log of base 2 because otherwise people will go omgwtfbbq over that 133. So afterwards 7.06 is still good, but not as grandiose and one could technically graph it more easily if you were predisposed to that kind of number wanging.

    Then I figured I might as well try that for headamps too. Not bad, not bad at all.

    upload_2021-9-10_11-51-32.png

    edit: sorry, forgot to mention that I have a x100 in the kg/W column just to make the numbers prettier
     
    • Like Like x 3
    • Epic Epic x 3
    • List
    Last edited: Sep 10, 2021
  7. Beefy

    Beefy Friend

    Pyrate
    Joined:
    Apr 10, 2021
    Likes Received:
    1,738
    Trophy Points:
    93
    Location:
    Canada
    What a rollercoaster ride. Metric units. Science humor. SomethingAwful references. The word 'wang'.

    What is most striking is the headamps pack way more weight-per-watt-wallop than speaker amps. Whodathunkit?
     
  8. rhythmdevils

    rhythmdevils MOT: rhythmdevils audio

    Pyrate
    Joined:
    Apr 15, 2020
    Likes Received:
    12,237
    Trophy Points:
    113
    Location:
    Bay Area, CA
    Home Page:
    [​IMG]
     
  9. Inoculator

    Inoculator Friend

    Pyrate
    Joined:
    Dec 5, 2018
    Likes Received:
    3,520
    Trophy Points:
    93
    Location:
    Tacoma, WA
    I know it is just not my cup of tea, but with that color scheme I only see this vibe

    [​IMG]
     
  10. Thad E Ginathom

    Thad E Ginathom Friend

    Pyrate
    Joined:
    Sep 27, 2015
    Likes Received:
    14,130
    Trophy Points:
    113
    Location:
    India
    Damn it, you maths people!

    Will you never stop finding things to baffle me?

    :drunk:
     
  11. Cspirou

    Cspirou They call me Sparky

    Pyrate
    Joined:
    Sep 27, 2015
    Likes Received:
    8,200
    Trophy Points:
    113
    Location:
    Northwest France
    Woo monoblocks with 2A3 tubes have got to be up there. ~30lbs per watt

    [​IMG]
     
  12. Cspirou

    Cspirou They call me Sparky

    Pyrate
    Joined:
    Sep 27, 2015
    Likes Received:
    8,200
    Trophy Points:
    113
    Location:
    Northwest France
    This is especially true for estat amps. Stax 007 on a Blue Hawaii at max volume is only 2mW 560mW
     
    Last edited: Sep 10, 2021
  13. rhythmdevils

    rhythmdevils MOT: rhythmdevils audio

    Pyrate
    Joined:
    Apr 15, 2020
    Likes Received:
    12,237
    Trophy Points:
    113
    Location:
    Bay Area, CA
    Home Page:
    i like the 70’s vibe
     
  14. Armaegis

    Armaegis Friend

    Pyrate BWC
    Joined:
    Sep 27, 2015
    Likes Received:
    7,461
    Trophy Points:
    113
    Location:
    Winnipeg
    In the speaker world, you're hovering between 2-16 ohms for the most part. That's within one order of magnitude, no problemo.

    Headphones though? We've got the RAAL ribbon at 0.2 ohms, the Audeze LCD-R at 2 ohm, "standard" headphones at 32 ohms, and then your high impedance cans at 300-600 ohms, and finally the Stax SR007 at 170k ohms. That's 4 different orders of magnitude, plus the electrostatic that's so far out it's basically a capacitor. It's practically impossible to cover such a wide range and be "good" at any of it. Headphones are weird man.

    That said, I'm actually rather surprised how little power the Stax uses even knowing the math behind it.
     
  15. Beefy

    Beefy Friend

    Pyrate
    Joined:
    Apr 10, 2021
    Likes Received:
    1,738
    Trophy Points:
    93
    Location:
    Canada
    That ain't right, surely.

    The 170 kohm is right, and say 340VRMS, it gives you 2 mA and 0.68 Watts just by ohms law.
     
  16. Cspirou

    Cspirou They call me Sparky

    Pyrate
    Joined:
    Sep 27, 2015
    Likes Received:
    8,200
    Trophy Points:
    113
    Location:
    Northwest France
    you are correct. I did P=V/R instead of P=V²/R

     
  17. Beefy

    Beefy Friend

    Pyrate
    Joined:
    Apr 10, 2021
    Likes Received:
    1,738
    Trophy Points:
    93
    Location:
    Canada
  18. Armaegis

    Armaegis Friend

    Pyrate BWC
    Joined:
    Sep 27, 2015
    Likes Received:
    7,461
    Trophy Points:
    113
    Location:
    Winnipeg
    Ah, I did not actually know what the voltage swing on the Blue Hawaii was. I just kinda napkin-math'd 100V and got 59mW and figured, eh it's probably *somewhere* around there and didn't check further lol.
     
  19. Cspirou

    Cspirou They call me Sparky

    Pyrate
    Joined:
    Sep 27, 2015
    Likes Received:
    8,200
    Trophy Points:
    113
    Location:
    Northwest France
    I usually get it right but miss a step in iOS calc sometimes. I'm pretty sure I read somewhere that STAX are usually in the 1mW range which is why I didn't question my result
     
  20. Beefy

    Beefy Friend

    Pyrate
    Joined:
    Apr 10, 2021
    Likes Received:
    1,738
    Trophy Points:
    93
    Location:
    Canada
    It advertises 1600 V P-P, so about 560 VRMS. But 340V was a nice round number to pull 2 mA.

    I think 1 mA seems more likely.
     

Share This Page