List of amps with a high damping factor

Discussion in 'General Audio Discussion' started by Noisypot, Jun 24, 2018.

  1. Ds2000

    Ds2000 All About every cool stereo component. Subscriber

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    The Stax DMA-X2 lists a sampling factor of over 100 in the users manual.
     

     

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  2. acmmty

    acmmty New Member

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    Kenwood amps M1, M1A, M1D, M2, M2A, KA-990, Ka-990V and others with the Kenwood Super DLD (Dinamic Linear Drive) circuit. Damping factor 50 Hz. = 1000
     
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  3. BinaryMike

    BinaryMike Pelagic EE Subscriber

    That's an interesting point. Some of those old amps could be adjusted for positive or negative DF, with an intermediate setting that yields theoretically infinite damping. Negative DF causes the amp to actively drive the woofer cone in the direction opposite to its current motion.
     
  4. E-Stat

    E-Stat AK Subscriber Subscriber

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    Current VTL amps like the current version of mine offer variable NFB.
     
    Last edited: Jun 24, 2018
  5. BMWCCA

    BMWCCA AK Subscriber Subscriber

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    The Crown PS400 and PS200s I use in my main system with JBL 4345 and its 18-inch woofer simply say ">400".
    The Crown Studio Reference-II I use with my JBL 250Ti's says ">20,000". That's twenty-thousand!
    They all sound lovely.
    :dunno:
     
    Last edited: Jun 25, 2018
  6. goodolpg

    goodolpg Just an old fart trying to help. Subscriber

    My Rotel RB-990BX supposedly has a damping factor of 1000.
     
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  7. mars_volta

    mars_volta Super Member

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    Adcom 555 ;)
     
  8. Roboturner91

    Roboturner91 AK Subscriber Subscriber

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    A slew of Yamaha 2-channel receivers in the early to mid 90s had damping factors of 240+ and they weren't even especially high-end models.
     
  9. GD70

    GD70 AK Subscriber Subscriber

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    JVC A-X9 100wpc 200 damping factor
    JVC/Vicror M-7050 150wpc 200 damping factor.
    JVC M-L10 160wpc,200 damping factor.
     
  10. faber12

    faber12 AK Subscriber Subscriber

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    Same with my 980BX, rated 1000. Really takes hold of my 2235H and makes them behave. :)
     
  11. Bill Ferris

    Bill Ferris Super Member

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    DF can be likened to a good shock absorber.
    Some like a soft ride, and some like a sporty ride.

    Higher DF # = the tighter control of the low frequency driver, less overshoot and the quicker return to the neutral state of the driver after a musical impulse(less smear).
    Dynamic Bass impulses, IMHO/E, has always sounded better/natural with tight control, whether it be it FB or low PS impedance, or both implemented.
    As an example,I have spent plenty of HQ time mixing live music and if a kick drum doesn`t have the "similar realistic" reproduced impact effect through a decent stereo, then for me, it needs to be addressed, and that`s always been one of my many goals amongst others in a reproducing audio system, at least mine.

    However, to each their own tastes.

    Kind regards, OKB
     
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  12. acmmty

    acmmty New Member

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    The only reason to strive for a high damping factor – which can, after all, do no harm – is the
    usual numbers game of impressing potential customers with specification figures. It is as certain
    as anything can be that the subjective difference between two amplifiers, one with a DF of 100 and
    the other boasting 2000, is undetectable by human perception. Nonetheless, the specifications look
    very different in the brochure, so means of maximizing the DF may be of some interest.

    "Audio Power Amplifier Design Handbook, Fifth Edition, Douglas Self"
     
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  13. damacman

    damacman Blown and Injected Subscriber

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    Easy now. Science has no place here!
     
  14. sdw54

    sdw54 Who? Subscriber

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    My Dad's old Bogen RR550 had adjustable damping factor. Don't recall where he set it, but I experimented with it when it was passed to me (50 years ago.
    As I recall, lower damping factor resulted in more (although mushier) bass.
     
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  15. Bill Ferris

    Bill Ferris Super Member

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    My experience as well. sdw54 on my B-I-L`s restored Fisher 100 "Box Car" mono block tube amps.
     
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  16. triode17

    triode17 Super Member

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    Once again, don't forget that DF is measured at the speaker terminals. Once you add a length of wire, the DF drops dramatically, like divided by 10 ! The thickest wire would be best for tube amps because of the low DF.
     

     

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  17. BinaryMike

    BinaryMike Pelagic EE Subscriber

    I think you mean to say that DF is measured at the amplifier output terminals, not at the speaker terminals, right?

    An elegant solution to this problem would be to drive the speaker through one pair of wires while taking feedback to the amplifier through a separate pair attached to the same speaker terminals. Lab power supplies often provide the necessary four-terminal hookup to guarantee excellent voltage regulation at the load, regardless of cable losses. Every hi-fi amplifier I've seen takes feedback from its output terminals instead, which is the reason that DF can be cable-limited. If I live long enough, I'm going to design and build myself a tube amp with four-terminal load connections.
     
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  18. Gibsonian

    Gibsonian Super Member

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    Yep, in general, that relationship can be heard.
     
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  19. triode17

    triode17 Super Member

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    That's a great idea! And you are right, I meant the amp. speaker terminals.
     
  20. Ds2000

    Ds2000 All About every cool stereo component. Subscriber

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    I think Kenwood did something similar in the early 80’s with their sigma drive. Then Onkyo with their super servo.
     
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