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  1. Old Comment
    rjm's Avatar

    Voltage Regulators for Line Level Audio. Part VII : The k-multiplier

    Good point, it seems R1=220 ohms is a better value.
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    Posted 3rd October 2014 at 12:17 PM by rjm rjm is offline
  2. Old Comment
    dady's Avatar

    PSE JJ 2A3/40 Convertible 7 to 15W amp

    With 300B also, get 15 or more watt.
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    Posted 30th September 2014 at 08:14 AM by dady dady is offline
  3. Old Comment
    abraxalito's Avatar

    New active speaker on order from Taobao

    Well that's bad news for learning, big mistakes spawn major lessons
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    Posted 30th September 2014 at 12:43 AM by abraxalito abraxalito is offline
  4. Old Comment
    fas42's Avatar

    New active speaker on order from Taobao

    Seems as if you can't put a foot wrong at the moment, Richard ...
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    Posted 29th September 2014 at 11:27 PM by fas42 fas42 is offline
  5. Old Comment
    abraxalito's Avatar

    Revisiting active speakers - HiVi D1010

    Yep, time and time again it all comes down to power supplies. I created a slogan 'No matter how important you think power supplies are, they eventually turn out to be even more important than that'.

    For example, just this week I've been surprised how good active opamp-based filters can sound, given top-notch power supplies. I'd never have imagined humble old TL084 (price 0.6rmb on Taobao) sounding that good so long as its PSU is looked after carefully. So much so that I'm considering active filters again.

    Having a decent sounding JFET buffer (and costing 0.15rmb) means cap sizes can all be reduced considerably, C0G ceramics get considerably cheaper at lower values.
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    Posted 24th September 2014 at 02:43 AM by abraxalito abraxalito is offline
    Updated 24th September 2014 at 02:47 AM by abraxalito
  6. Old Comment
    fas42's Avatar

    Revisiting active speakers - HiVi D1010

    Nice continuing saga - note that the major benefits come through from giving the power supply more grunt, in every area - highly likely the hash and tubbiness will be resolved at a certain point, just by focusing on that ...
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    Posted 24th September 2014 at 01:27 AM by fas42 fas42 is offline
  7. Old Comment
    abraxalito's Avatar

    Revisiting active speakers - HiVi D1010

    Yes - with the back open the port (a rectangular arrangement at the top) is bypassed. But no fan effect as the fins of the heatsink aren't positioned to encounter any air movement. Making the port out of aluminimum and putting the chips on the outside of that might be a solution. Far easier though to go classD....
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    Posted 22nd September 2014 at 05:53 AM by abraxalito abraxalito is offline
  8. Old Comment
    fas42's Avatar

    Revisiting active speakers - HiVi D1010

    So the electronics are within the bass reflex cavity - is the concept perhaps that the harder the speaker is working the more air moves around internally, that the bass driver is effectively working like a fan?

    Edit: along those lines it would be interesting to run a thermocouple inside and attach to the heatsink, see how it varies with power levels, and level of bass content.
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    Posted 22nd September 2014 at 05:17 AM by fas42 fas42 is offline
    Updated 22nd September 2014 at 05:20 AM by fas42
  9. Old Comment
    abraxalito's Avatar

    Revisiting active speakers - HiVi D1010

    With the backplate open, bass sufferes a fair bit. I haven't much tried things at high level because even with no signal the heatsink's too hot to touch for more than a couple of seconds.

    I think the best solution would be to replace the internal spacer with something thermally conductive, to let heat excape to the back panel. Incidentally the pic I've included doesn't accurately reflect the model I have - mine has the heatsink further from the back panel (by 1cm or so). Not sure why they did that.....
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    Posted 22nd September 2014 at 04:16 AM by abraxalito abraxalito is offline
    Updated 22nd September 2014 at 04:19 AM by abraxalito
  10. Old Comment
    fas42's Avatar

    Revisiting active speakers - HiVi D1010

    Re the heatsink very hot, have you tried running them at high levels with the back plate not fully pushed in, say 1/2" gap - not screwed into place should not change the driver behaviour, should it? Would get a funnel effect dissipating heat, does it sound better when the chips are not thermally stressed?

    If a positive there, you could butcher the case, drill and jigjaw holes to provide venting ...
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    Posted 22nd September 2014 at 03:19 AM by fas42 fas42 is offline
  11. Old Comment
    fas42's Avatar

    Revisiting active speakers - HiVi D1010

    I put it down mainly to laziness - they don't want their world view to be complicated by new "evidence" possibly disrupting long held views; the easiest course of action is to shout down the "interlopers", hoping that will scare them away, and thereby leave the old guard to peacefully ruminate under a tree ...
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    Posted 22nd September 2014 at 03:02 AM by fas42 fas42 is offline
  12. Old Comment
    abraxalito's Avatar

    Revisiting active speakers - HiVi D1010



    I've never understood this stick that's used by objectivists that 'no-one will take you seriously if you don't (fill in objectivist shibboleth of your choice here)'.

    Why would I care if people don't take me seriously? Its their loss if I'm on to something and they choose to ignore me....
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    Posted 22nd September 2014 at 02:21 AM by abraxalito abraxalito is offline
  13. Old Comment
    fas42's Avatar

    Revisiting active speakers - HiVi D1010

    No wincing allowed, Richard - definitely a no-no in this audio game ... of course, you would have to statistically prove that you were wincing, for anyone to take you seriously ...
    permalink
    Posted 22nd September 2014 at 12:33 AM by fas42 fas42 is offline
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