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Anyone compared high end Class D power amps?

Discussion in 'audio' started by Thetiminator, Jan 7, 2020.

  1. Julf

    Julf Facts are our friends

    No.

    Modern class D amps operate at frequencies where that isn't an issue.
     
    Paul Burke likes this.
  2. Thetiminator

    Thetiminator Painfully virile

    I can only speak from my experience with Class D on super efficient speakers and I’ve found them to be stunning. My last power amps were £30k and the Temple Audios are every bit as good.
    Maybe that’s speaker related but I’m not going back to valves/class A/B that’s for sure....
     
  3. Thetiminator

    Thetiminator Painfully virile

    Ah I was led to believe that the extremely high DF’s that Class D tend to have over damped the bass hence you could get a thin sound in certain set ups....
    Maybe it’s just coincidence though and just the inherent sound of some of the less well implemented Class D amps...?
     
  4. Arkless Electronics

    Arkless Electronics Trade: Amp design and repairs.

    For speakers of such high efficiency I would go for low powered solid state class A amplification. This should beat anything else. I've no suggestions as such things will usually need to be built to order of from kits (both of which I can help with).
     
  5. Thetiminator

    Thetiminator Painfully virile

    I don’t have any experience of the Bantam one but I’ve heard that unless you need the monoblocks they out perform the rest of the range including the mono’s....
     
  6. Paul Burke

    Paul Burke pfm Member

    ToTo Man likes this.
  7. Thetiminator

    Thetiminator Painfully virile

    Class A is kind of a no option as the amps are on 12-14 hours a day generally. Aside that there were noise issues with anything I tried unless it was stupid money. I had dem’s of some mega valve amps at 5 series money and aside a slightly more natural sound they were generally walloped by the Temples...it appears that super efficient speakers are very good at highlighting less than perfect designs...?
     
  8. jobseeker

    jobseeker pfm Member

    I can tell you that the two Mytek Brooklyn amps I’m using sound superb imo :). Tiny power-houses. That’s either as monoblocs or stereo amps. Gato are great too.
     
    Strictly Stereo likes this.
  9. Arkless Electronics

    Arkless Electronics Trade: Amp design and repairs.

    As I said up thread there are no noise issues with different classes of amplification. Nor does price tend to have all that much to do with it (beyond many cheaper valve amps any way).
    With 10W ish class A amps the heat should not be a problem even if on for hours at a time.
    Class A is the least compromised and nearest to perfect amplifier class.

    Sorry can't really give any further advice as all the "why's?", "if's", "but's" and caveats get too technical for the general audio area.
     
  10. mandryka

    mandryka pfm Member


    I have an amp which runs the first 2W in class A and it's on all day when I'm at home, it runs warm but not hot. Whether it's ever out of class A is a question I can't answer. How can anyone find out? You can easily pick up this sort of amp for less than 1K.
     
  11. stevec67

    stevec67 pfm Member

    As Arkless says, a low power Class A (Hiraga Monstre, JLH, etc) will consume about 60W day and night when switched on. That's as much heat as is generated by a traditional table lamp.
     
  12. Arkless Electronics

    Arkless Electronics Trade: Amp design and repairs.

    What's that then?
     
  13. mandryka

    mandryka pfm Member

    The electrocompaniet ECI-2
     
  14. Julf

    Julf Facts are our friends

    If it was an issue, it would be easily solved by using slightly longer speaker cables, or thinner gauge (lamp wire? :) ).
     
  15. Alex S

    Alex S carbon based lifeform

    Steve, I’m sorry I really couldn’t say. Back in the day I sold my Naim amps in favour of Dynavector. Then I went beefy valves for a while. When I didn’t need their power I got a Sugden A21. Then, thanks to Peter Stockwell I bought the Amptastic Tripath amp for £100 and was a bit shocked. This lead me to Temple Audio. In short, the Bantam One is a great amplifier (and is better and nicer to look at than the mono blocks) but so is an Avondaled 250 IM(limited)E.

    In short there’s no way of knowing without trying. System, room, taste dependent but having tried almost all flavours, I basically think a good amp is a good amp no matter the recipe provided it can drive your speakers. I would finally add that the Bantam and Khozmo are absolutely the last things I’d think of changing.
     
    steveinspain likes this.
  16. Alex S

    Alex S carbon based lifeform

    What power supply are you using with your monos?
     
  17. Thetiminator

    Thetiminator Painfully virile

    Just the Temple Audio ones on the website. They’re £500 a pair, the same as the amps, but they did make a noticeable difference...worth the money imo.
     
    Alex S likes this.
  18. Thetiminator

    Thetiminator Painfully virile

    Thanks for the info. I wasn’t aware that class a amps could use so little power, I thought they all boiled themselves alive and melted your wallpaper. Of course now it makes sense that lower power versions use less power and less heat...doh!
    I’ve had low wattage valve amps that fired out tonnes of heat (literally couldn’t sit in the room with them), do SS class A put out less heat than valve amps for the same power output? As a general rule....?

    If this is the case it definitely opens the door to class a SS amps. Probably the ideal sound I’m looking for....
     
  19. Thetiminator

    Thetiminator Painfully virile

    The noise could be the decider though, looking at specs (which I don’t claim to understand) it seemed that only amps with S/N ratios well above 100 were quiet enough for the speakers....
     
  20. Arkless Electronics

    Arkless Electronics Trade: Amp design and repairs.

    A class A valve amp will put out a bit more heat than a class A SS one due to the valve's heater's. Some valve one's will use a valve rectifier as well which will contribute a fair bit of heat.

    Most low-ish output valve amps are indeed class A.
     

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