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Luxman/Accuphase/Yamaha - Quality?

Discussion in 'audio' started by Paulq2, Jun 11, 2020.

  1. gints

    gints pfm Member

    Yes, crossover may take same power away. Looked it up, Sue probably ment conversion of the electrical power of the amplifier to the emitted (acoustical) sound power of the speaker and that number is 2 and less percent.
    In comparison A class is not so bad.
     
    Sue Pertwee-Tyr likes this.
  2. Sue Pertwee-Tyr

    Sue Pertwee-Tyr Well, I can dream, can’t I?

    Only one of us has overreacted here. I simply suggested you take it up with Accuphase see what they said and you then went off on one and accused me of being touchy. I’ve simply defended myself against escalating irritability from you since then.
     
  3. Sue Pertwee-Tyr

    Sue Pertwee-Tyr Well, I can dream, can’t I?

    Yes, exactly, thank you :)
     
  4. Woodface

    Woodface pfm Member

    Yes, interesting but running class a probably compounds the issue; two wrongs etc. I honestly don’t care, whatever floats ones boat. Personally couldn’t live with the heat generation in summer & the reported warm up time. Just seems rather wasteful? Anyway, not my bills.
     
  5. Sue Pertwee-Tyr

    Sue Pertwee-Tyr Well, I can dream, can’t I?

    You just have to play it louder in hotter weather. Simples :)
     
    Miss Ariel likes this.
  6. Woodface

    Woodface pfm Member

    It was merely an observation. Why would I take it up with Accuphase when I have no intention of buying any of their excellent products. I will add you to my ignore list as I do not wish to offend you any further, I suggest you do likewise. All the best, life is far too short.
     
  7. Sue Pertwee-Tyr

    Sue Pertwee-Tyr Well, I can dream, can’t I?

    Long list, is it?

    You do realise that you putting me on your ignore list doesn’t mean I don’t see your posts, don’t you? It’s not like the Bugblatter beast of Traal.
     
  8. S-Man

    S-Man Kinkless Tetrode Admirer

    100WRMS is 200W peak.
    To achieve 200W peak into 8 Ohms we need 5A peak @ 40V
    A class A push-pull amp needs a standing current of 2.5A to stay in class A up to 100W RMS.
    If we assume the supply rails are nominally +/-55V to allow for supply sag and some headroom to achieve the fabled doubling of power for halving the load resistance then output stage dissipation will be approx 2 X 55 X 2.5 = 275W under no-signal conditions.

    Conclusion 1: Accuphase's specification is entirely credible.

    With a class A amp, any power supplied to the speaker is diverted from the output stage into the speaker (unlike class B where the power supply has to supply the increased power as the signal varies). So if you put 5W average into a speaker, the output stage dissipation will reduce from 275W to 270W.

    If you put 5W average into a speaker that is 2% efficient, 98% of the power (4.9W) will be dissipated in the voice coil as heat and 2% (0.1W) will be converted into acoustic power.

    Conclusion 2: The amp is the bit that wastes the most power. In the above example, it wastes about 300W (270W + the power for the other stages of the amp) and the speaker wastes 4.9W.
     
    Suffolk Tony and James like this.
  9. maccar

    maccar pfm Member

    Thank God for this post... I was enjoying this thread till a few pages back.
    It's beginning to turn into a cable like saga.
    Mac
     
  10. maccar

    maccar pfm Member

    A friend of mine has just traded in all of his top of the range Naim kit and an MBL amp for an Esoteric N01XD DAC/streamer and a class A Esoteric F0A which he intends to pair with some Tannoy GRF's
    Looking forward to hearing his thoughts when the gear arrives in June.
    Mac
     
  11. Amber Audio

    Amber Audio This is the Day

    Be interested to hear about that system if you wouldn’t mind posting your impression, realistically be 2022 before I’m gonna be thinking of travelling to a dealer demo, Glasgow isn’t that far away where the nearest Esoteric shop. What is your mate replacing?
     
  12. Old Shatterhand

    Old Shatterhand pfm Member

    Maybe you should do this via PM because Esoteric isn't Luxman, Accuphase or Yamaha. Thank you!:)
     
  13. Amber Audio

    Amber Audio This is the Day

    What’s a PN? part number?
     
  14. Bjork67

    Bjork67 pfm Member

    Pink Nodules if I'm thinking correctly.
     
  15. Amber Audio

    Amber Audio This is the Day

    Two of them, bit on the dangly side?
     
  16. Old Shatterhand

    Old Shatterhand pfm Member

    Sorry, I meant PM.:oops:
    PN= (in Germany) Persönliche Nachricht = PM = Personal Massage.
     
    johnacurtis likes this.
  17. maccar

    maccar pfm Member

    Sorry, don't know the specific models, only that the Naim is a 4 box system and the MBL is a class D intigrated.
    I'll be sure to pass on his impressions.
    Mac
     
    Amber Audio likes this.
  18. maccar

    maccar pfm Member

  19. Amber Audio

    Amber Audio This is the Day

    Darren L likes this.
  20. Woodface

    Woodface pfm Member

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