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Thread: Kenwood M1 power amplifier

  1. #1
    Join Date: Mar 2010

    Location: Cardiff

    Posts: 338
    I'm Rockabilly.

    Default Kenwood M1 power amplifier



    For private sale is a Kenwood M1 power amplifier.

    The amplifier is in working condition.
    This black box will give you 105W into a nominal 8.
    The damping factor is monumental and the bass grip is superb.

    Power output: 105 watts per channel into 8Ω (stereo)
    Frequency response: 1Hz to 300kHz
    Total harmonic distortion: 0.005%
    Damping factor: 1000
    Input sensitivity: 1V
    Signal to noise ratio: 120dB
    Speaker load impedance: 4Ω to 16Ω
    Dimensions: 440 x 112 x 324mm
    Weight: 9.1kg

    This particular unit is a 220V European version.

    https://www.vintageshifi.com/reperto...1-Brochure.pdf

    https://www.hifiengine.com/manual_li...basic-m1.shtml

    http://www.hifi-classic.net/review/k...d-m-1-367.html

    The amp is 35 years old.

    The price is 199.
    Payment via PayPal, please.
    Carriage is extra to this, to be covered by the buyer.
    Thanks.















    Johnny Dodgem.

    Cartridges vintage MMs including Pickering xsv3000/D3000 : Stanton 881s/D81 : AT140LC/VMN40ML
    Spinners 1210 (Jelco 750D, Origami, Ammonite, Longdog, Vantage, Achromats) : Pye G63 & Garrard AT6 : Two full custom Lencos : Kenwood KD-650D
    Streaming Qobuz : BluOS & Node2 (Fidelity Audio modified) : RME ADI-2 DAC
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    Power Amps Decware Taboo se84ts+ (Hazen modified) : Primaluna ProLogue 4 (KT-77)
    Speakers The Edingdale : Meadowlark Hot Rod Shearwater

  2. #2
    Join Date: Mar 2010

    Location: Cardiff

    Posts: 338
    I'm Rockabilly.

    Default

    A lot of juice for the money.

  3. #3
    Join Date: Jun 2015

    Location: London/Durham

    Posts: 4,274
    I'm Lawrence.

    Default

    What's the Sigma Sensor thing all about?

  4. #4
    Join Date: Mar 2010

    Location: Cardiff

    Posts: 338
    I'm Rockabilly.

    Default Sigma Drive

    Sigma Drive does not have to be used to enjoy this amp.

    However, all of the answers are available here:

    http://www.cieri.net/Documenti/Kenwo...al%20Guide.pdf

    In short,"Kenwood's Sigma Drive has been widely acclaimed as an effective means of providing optimum speaker control and an extremely high damping factor right up to the speaker input terminals. In addition to the normal speaker leads, a special 'Sigma' connection feeds distortion products caused in the speaker wires and in the speakers themselves back into the amplifier's NFB loop for effective compensation. The result is a total control over the speaker's behaviour, with optimum damping of unwanted speaker movement."

    This is how you use the Sigma Drive, if you wish:




  5. #5
    Join Date: Jan 2008

    Location: Norfolk, UK

    Posts: 4,759
    I'm Rob.

    Default

    How bizarre, never seen anything like that before.

  6. #6
    Join Date: Mar 2010

    Location: Cardiff

    Posts: 338
    I'm Rockabilly.

    Default

    The speaker output terminals don't accept banana plugs, but to reiterate, it can be used with conventional speaker wiring.
    The review below evaluates the amp without the Sigma Drive employed.

    "It is satisfying to find this calibre of performance at what must be considered very moderate prices in today's market."

    http://www.hifi-classic.net/review/k...d-m-1-367.html

  7. #7
    Join Date: Jun 2015

    Location: London/Durham

    Posts: 4,274
    I'm Lawrence.

    Default

    I was wondering how they got a damping factor of 1000. Paper here but it's over my head:

    https://www.google.com/url?sa=t&sour...=1605732656971

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