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  1. #21
    Join Date: Apr 2009

    Location: Near Saffron Walden, Essex

    Posts: 7,087
    I'm Dave.

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    Definitely Monitor Audio cables and they did give some amps a hard time. Back in the day we used to make those up with ring main cable in parallel, taped together, with the ring main cable used for the bass driver and Litz for the HF.

  2. #22
    Join Date: Jan 2009

    Location: Essex

    Posts: 31,853
    I'm openingabottleofwine.

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    Those cables were designed to have a characteristic impedance of around 8 Ohm, in the mistaken belief that in doing so they would 'match' the nominal impedance of the speaker. Interconnects cannot be treated as transmission lines at audio frequencies, because the concept of characteristic impedance does not apply at audio frequencies (or to any frequency where the wavelength is longer than 6x the cable length; for example at 10kHz, the wavelength is approximately 20km, so the cables would have to be over 3km long!).

    To achieve the low characteristic impedance, the Monitor Audio cable uses a woven Litz construction: having a very high capacitance per unit length and a very low inductance per unit length. The latter is desirable the former is not, and can cause instability problems with some SS amps. However there ought not be any problem if used with a valve amplifier, nor should there be a problem if used with electrostatic speakers (provided of course the amplifier can drive ESLs).
    Barry

  3. #23
    Audio Al is offline Pishanto Specialist & Super-Daftee
    Join Date: May 2012

    Location: Dagenham Essex

    Posts: 11,215
    I'm Allen.

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    Quote Originally Posted by karma67 View Post
    ah ok, what length are they?
    They are a 24 foot pair , Flat type
    [

  4. #24
    Join Date: Sep 2014

    Location: brighton uk.

    Posts: 4,737
    I'm jamie.

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    Quote Originally Posted by Audio Al View Post
    They are a 24 foot pair , Flat type
    bloody hell! i wouldn't mind a loan if your feeling generous?
    My System
    John Wood KT88 Amp.
    Paradise Phono Stage
    Sony TTS-8000 Turntable.
    PMAT-1010 MK6 Tonearm.
    Ortofon Cadenza Bronze
    Sony X555ES Cd Player
    Yamaha NS1000m Speakers

  5. #25
    Audio Al is offline Pishanto Specialist & Super-Daftee
    Join Date: May 2012

    Location: Dagenham Essex

    Posts: 11,215
    I'm Allen.

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    Quote Originally Posted by karma67 View Post
    bloody hell! i wouldn't mind a loan if your feeling generous?
    £ $ or Euros and how much

    I had a nightmare trying to sent a parcel using the Post office , took me 2 days to find one that was open

    This is my local main post office opening times


    Heathway
    28 The Mall, Heathway, Dagenham, Essex
    RM10 8RE
    How to find us
    Opening times Normal Seasonal


    Mon Closed
    Tue Closed
    Wed Closed
    Thu Closed
    Fri Closed
    Sat Closed
    Sun Closed
    [

  6. #26
    Join Date: Mar 2017

    Location: Seaford UK

    Posts: 1,861
    I'm Dennis.

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    Quote Originally Posted by Barry View Post
    Those cables were designed to have a characteristic impedance of around 8 Ohm, in the mistaken belief that in doing so they would 'match' the nominal impedance of the speaker. Interconnects cannot be treated as transmission lines at audio frequencies, because the concept of characteristic impedance does not apply at audio frequencies (or to any frequency where the wavelength is longer than 6x the cable length; for example at 10kHz, the wavelength is approximately 20km, so the cables would have to be over 3km long!).

    To achieve the low characteristic impedance, the Monitor Audio cable uses a woven Litz construction: having a very high capacitance per unit length and a very low inductance per unit length. The latter is desirable the former is not, and can cause instability problems with some SS amps. However there ought not be any problem if used with a valve amplifier, nor should there be a problem if used with electrostatic speakers (provided of course the amplifier can drive ESLs).
    I don't recognise your wavelength calculation.

    To me it is much more relevant that transmission line theory applies when a source Z is equal to the load Z, and in audio signal transfer, both for signals and for power to the speakers, the source Z is many times less than the load Z, and so Xsmission theory does not apply.

    I remember arguing this point with my then Telecoms lecturer in about '79.

  7. #27
    Join Date: Sep 2014

    Location: brighton uk.

    Posts: 4,737
    I'm jamie.

    Default

    Quote Originally Posted by Audio Al View Post
    £ $ or Euros and how much

    I had a nightmare trying to sent a parcel using the Post office , took me 2 days to find one that was open

    This is my local main post office opening times


    Heathway
    28 The Mall, Heathway, Dagenham, Essex
    RM10 8RE
    How to find us
    Opening times Normal Seasonal


    Mon Closed
    Tue Closed
    Wed Closed
    Thu Closed
    Fri Closed
    Sat Closed
    Sun Closed
    so that's a no then ?
    My System
    John Wood KT88 Amp.
    Paradise Phono Stage
    Sony TTS-8000 Turntable.
    PMAT-1010 MK6 Tonearm.
    Ortofon Cadenza Bronze
    Sony X555ES Cd Player
    Yamaha NS1000m Speakers

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