Any experience with Class D amps and impressions?

Discussion in 'New Gear - Performance' started by kurtgo, Mar 14, 2018.

  1. Poultrygeist

    Poultrygeist Lunatic Member

    I use Astron linear power supplies with class D amps ( see post 82 and 83 ). You can readily hear the improved SQ vs a SMPS.
     
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  2. Pio1980

    Pio1980 AK Member Subscriber

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    The Allo + series amps use active onboard filtering and reservoir to alleviate some of the limitations of pulse mode power.
     
  3. Poultrygeist

    Poultrygeist Lunatic Member

    Another example of a class D TPA3116 powered by a linear regulated power supply ( heavy iron ).

    P3220030.jpg
     
    Last edited: Aug 15, 2018
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  4. Soundphile

    Soundphile Active Member

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    With GaN, the ultrasonic high frequency noise "shoot-through" is already significantly reduced vs MOSFETS. Most of the development with GaN has been focused on amplifiers. But GaN can and is being developed for SMPS as well, with reduced noise and clean, usable power. Development in both Class D amplifier and SMPS employing Gan is progressing at a rapid pace and even now, producing stunning audio quality. Its just a matter of time.
    Since Class D amps have very high efficiency levels (>93% ?), the Linear Power Supplies only need to be relatively small (and not take up that much more extra space) to effectively power them to hundreds of glorious Watts per channel, without breaking sweat.
     
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  5. 4xoddic

    4xoddic New Member

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    I've been using a Yamaha P7000s (750W x 2 @ 8 Ω; 950W x 2@ 4 Ω) for 5 years. Yamaha has a newer line: PX series models are driven by a newly developed Class-D amplifier engine with a custom LSI.

    The PS series touted Yamaha's own digital EEEngine:

    EEEngine delivers incredible power while preserving sound quality
    As a power amplifier's output increases, its driving mechanism becomes more significant. Yamaha's exclusive EEEngine amplifier driving technology supplies the voltage level necessary for the level of input signal through switching circuit and smoothing circuit, producing a highly effective driving mechanism. This is a revolutionary power amplifier driving technology that offers the function of a Class AB amplifier and the efficiency of a Class D amplifier. EEEngine gives you fantastic power, highly efficient driving function, and tremendous energy savings, all without sacrificing the sound quality demanded of a professional power amplifier. This technology is included in many of Yamaha's power amplifiers, and proves its utility in all kinds of situations, from sound reinforcement to permanent installation.


    I had previously used a QSC GX7 to power the front Polk RTia9s in a 7.0 HT; using a Pioneer SC-07 as a pre (the SC-07 was fine for HT; but => listening fatigue for 2-channel CD, I believe its early ICE amps' 140W was too little for the RTIa9s). They became "musical" with > 700 WPC. The fans on the QSC ran constantly, => low WAF.

    I replaced the QSC with the Yamaha P7000S. The fans have never come on. I replaced the SC-07 with a Yamaha ‎RX-A1050 2 years ago. Use a BD-A1040 as a 2-channel source, amp & player in Pure Direct.

    Recently upgraded the front 2 speakers to Focal Electra 1038BEs (93dB, 3.3 Ω min.) I've read a lot of Google that the Focals would be revealing of less than acceptable sources/amplificaton. I have no complaints. The Focals are a vast improvement over the RTia9s; the WAF? I didn't think I'd be able to hear the difference, but I can.

    I'm using some very cheap RCA>XLR cables. The P7000S was a B-stock from ebay for $600.

    Among the latest offerings, I've contemplated the PS Audio Stellar M700 monoblocks, as their form factor & looks are more conventional than the P7000S; and ~ half the power @ 5 X the price.
     
  6. kurtgo

    kurtgo AK Subscriber Subscriber

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    4xpddoc - funny you should bring up the PS Audio M700's. I just ordered a pair last week. We'll see how they stack up. Hope they don't take too long to break in - or even better if they don't need breaking in? Can't wait to compare them to what I have now.
     

     

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  7. Poultrygeist

    Poultrygeist Lunatic Member

    The Volt+ on the left in a diy case cost $39 but it's linear power supply cost about three times that. It's close to the Volt+D in performance but the Volt+D uses an inexpensive power brick and hardly benefits ( if at all ) from a linear psu. As Pio noted the onboard filtering ( aka capacitance multiplier ) allows use of inexpensive SMPS.

    P1010003.jpg
     
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  8. Poultrygeist

    Poultrygeist Lunatic Member

    Here's the acrylic case Volt+ ( not the newest Volt+D ) and the very popular $99 Topping DAC. Good examples of cheap and cheerful gear paired with some pretty good speakers.

     
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  9. fredgarvin

    fredgarvin AK Subscriber Subscriber

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    I've heard a lot of good things about those. Their buffered input is said to match very well with the IcePower modules.
     
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  10. JMiP

    JMiP AK Subscriber Subscriber

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    I have the Class D Audio CDA-250C power amp that is pretty decent. I'm not sure how old it is since I bought it off of another AKer in BarterTown, but it sounds good. My only issue with it is that is requires a lot of volume from the preamp to get my ADS L810 speakers going, which are quite efficient, so I'm not sure why I need to crank the volume up to the 12:00 o'clock position to get it to play at a sufficient volume. "Sufficient volume" defined as "not quiet but not loud enough to make people shout to be heard."

    This amp is definitely good enough to keep my interest in class D amps going.
     
  11. kurtgo

    kurtgo AK Subscriber Subscriber

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    Got the M700's a couple of days ago. They are "warmer" and some might say darker than the ClassDAmp. They certainly tamed the higher end shrill I had. I just don't know if they'll change as they play more music. Also, have a lot of adjusting to do with the speakers as there are plenty of controls on them to do so. Also, will probably put some brighter op amps in my DAC as well. Hoping these will be the last amps I buy.
     

     

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  12. mkane

    mkane AK Subscriber Subscriber

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    8 amps down the road............
     
  13. slow_jazz

    slow_jazz Lunatic Member

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    I had one a while back and wasn't impressed.

    Haven't heard some of these newer ones.
     
  14. Poultrygeist

    Poultrygeist Lunatic Member

    The new $129 Volt+D from India replaced a much loved SET amp in this system.

    P1010023.jpg
     
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  15. Poultrygeist

    Poultrygeist Lunatic Member

  16. Poultrygeist

    Poultrygeist Lunatic Member

     

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  17. mkane

    mkane AK Subscriber Subscriber

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    Notice a difference in sound quality compared to SMPS? thanks
     
  18. Poultrygeist

    Poultrygeist Lunatic Member

    With that amp, yes. With the Volt+D not so much.
     
  19. mkane

    mkane AK Subscriber Subscriber

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    I'm tossing around the idea of a linear PS for my TI D Class module.
     
  20. Pio1980

    Pio1980 AK Member Subscriber

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    That good, eh?
     

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