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Thread: NHB-18NS preamp with Burmester 911 amps?

  1. #1
    Addicted to Best! joeinid's Avatar
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    NHB-18NS preamp with Burmester 911 amps?

    Does anyone have experience with this combo? Thanks!

    Output impedance for the NHB-18NS: 50 ohms for BNC, < 100 ohms for RCA, 600 ohms for XLR

    Burmester 911mk3 input impedance: 22.9kOhms Unbalanced, 1.88kOhms Balanced
    Last edited by joeinid; 08-02-2012 at 02:31 PM.
    Joe


  2. #2
    Addicted to Best! wizard's Avatar
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    From Stereophile
    18NS output impedance:
    unbalanced - 20Hz/1kHz 155 ohm, 20kHz 410ohm.
    balanced - 20Hz/1kHz 2500ohm, 20kHz 3080 ohm.

    I-Fidelity
    911 input impedance 12k
    Last edited by wizard; 08-04-2012 at 10:20 AM.

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    Addicted to Best! AudioExplorations's Avatar
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    wizard where do you get the 911 input impedance info from? thanks.

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    Addicted to Best! joeinid's Avatar
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    I'm so confused.
    Joe


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    Addicted to Best! wizard's Avatar
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    Quote Originally Posted by AudioExplorations View Post
    wizard where do you get the 911 input impedance info from? thanks.
    From this German review

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    Addicted to Best! AudioExplorations's Avatar
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    The 911 input impedance remains a mystery.

    Burmester manual: 1.88 kOhm (balanced), 22.9 kOhm (unbalanced)
    i-fidelity.net measurement: 12 kOhm (connection type not specified)
    My personal measurement: 2.05 kOhm (balanced), 1.01 kOhm (unbalanced)

  7. #7
    Addicted to Best! joeinid's Avatar
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    Quote Originally Posted by AudioExplorations View Post
    The 911 input impedance remains a mystery.

    Burmester manual: 1.88 kOhm (balanced), 22.9 kOhm (unbalanced)
    i-fidelity.net measurement: 12 kOhm (connection type not specified)
    My personal measurement: 2.05 kOhm (balanced), 1.01 kOhm (unbalanced)
    This is one personal pet peeve of mine and Burmester, their lack of published credible information. Just look at the internal fuse misinformation.
    Joe


  8. #8
    Addicted to Best! wizard's Avatar
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    The Swedish magazine Hifi&Musik measure the balanced input impedance to 1,5k.

    And the output power to: 8/4/2/1ohm 195/344/545/723watts.


    18NS connected to 911 using the unbalanced input should be no problem, also no problem if the 911 unbalanced input impedance is 12k.

  9. #9
    Addicted to Best! AudioExplorations's Avatar
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    Well, a few others on this forum run ARC and concert fidelity preamps into the 911 balanced without issues, so the 1:10 impedance rule may not be the determining factor after all.

  10. #10
    Senior Member Rocco I.'s Avatar
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    Quote Originally Posted by joeinid View Post
    I'm so confused.
    Dear Joe,

    I thought that from very long time!

    Sorry for the frankness of opinion!
    Kindest regards.
    R.


    Music is the mediator between the spiritual and the sensual life - Ludwig Van Beethoven

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