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Any experience with Class D amps and impressions?

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

  1. Pio1980

    Pio1980 AK Member Subscriber

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    A websearch indicates that I live in a cave, these things are apparently going to take over switch mode tech.
     

     

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  2. opnly bafld

    opnly bafld AK Subscriber Subscriber

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    Still just 50w/ch.
     
  3. eteller

    eteller AK Subscriber Subscriber

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    100w per side is easy math.
     
  4. Wildcat

    Wildcat Audio Sommelier Subscriber

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    Late reply (hopefully not answered already), but...

    Their Stellar power amps have Class D output stages, paired with a Class A "Analog Cell" input stage. The S300 is 140w/ch 8Ω and 300w/ch 4Ω, and the M700 monoblocks are 350w 8Ω and 700w 4Ω. They impressed quite a few at AXPONA with the Stellar Stack they were running (Stellar Gain Cell DAC as the source).

    The BHK amps are at another level entirely, a "cost no object" design.
     
    olson_jr and StimpyWan like this.
  5. toxcrusadr

    toxcrusadr AK Subscriber Subscriber

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    So, here's a dumb question about these amps. They put out so much power, but the power supply caps are so much smaller than those in 'traditional' amps. No one is complaining about that, so I assume this means that the way the thing works eliminates the need for all that capacitance. Anyone able to elaborate?
     
  6. Pio1980

    Pio1980 AK Member Subscriber

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    Some use an active "capacitance multiplier" in the power supply input.
     

     

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  7. 45rpmspinner

    45rpmspinner AK Subscriber Subscriber

    I've seen some huge caps added to the front these boards, but as I understand it, you'd better have a "soft start" mechanism somewhere in line.

    What's small in this regard? I honestly don't know.
    Off hand, I can think of one power board which offers over 28,000uf before the input caps.
     
  8. E-Stat

    E-Stat AK Subscriber Subscriber

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    That's true if your speakers can be bi-amped. I enjoy my A100 in the office, but the outputs cannot be bridged.
     
    Mamrak1 likes this.
  9. mikeburns

    mikeburns Active Member

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    I have a ClassDAudio SDS 470C 4 channel amp. I only use two channels to power my 4 ohm Monitor Audio Silver 8s. The step up in audio quality from my previous Rotel amps (bridged and in plain stereo) was profound, despite the rotels having a good reputation and big power supply. The SDS470c is beautifully powerful and grabs a hold of these speakers. Transients are totally covered all the way up to the highest SPL and they never get harsh or grainy like they used to with the rotels (likely they were clipping).

    The SDS470c seems much warmer than the Rotel. I used to think my Silver 8s were sharp and harsh at the top end. I now think that was entirely the amp. The class d audio amp is beautifully warm, has big, clean bass, realistic mids and rich in tone yet just as detailed as the rotel. Yet the detail doesn't feel like it is etching sound into my temples haha. I really like the sds470c and do not see myself upgrading any time soon. I can listen to it all night and it never makes the speakers sound too bright, just beautifully balanced. I cannot recommend classdaudio amps enough. If they can be bettered it is likely through a little more exciting high end lift as they are so balanced and neutral sounding it may not get the sparkle juices flowing like other more lively amps may. I don't care though as the presentation the SDS470c gives is exactly what I was after.
     
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  10. john111/LZ

    john111/LZ Lunatic Member

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    IMG_20181003_151608.jpg
    Allo D+,valve pre,this CD....utterly involving and im all ears....:):beatnik::)
     
    Poultrygeist likes this.
  11. sfseay

    sfseay Active Member

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    I still enjoy one of the best Class D amps ever put in an Integrated Amplifier. The Esotric I-03, one of the first products to come out of Esoteric’s Master Sound Works group is phenomenal and it’s original MSRP of $12,000.00 was a statement when it was shipping in 2011. I don’t think it sold well in the US, and I did purchase mine used. Too bad the Class D amp in the I-03 didn’t carry over to any of the new F-0X series of integrated. Wonderful component and plays way above competing Class D amps still.
     

     

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  12. Mister Pig

    Mister Pig Pigamus Maximus Subscriber

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    Here is a pic of my H20 Audio amplifier that is 250 WPC of Class D power. I would like to think the power supply caps are pretty substantial. As is the dual stacked toroidal transformers. Also capable of driving a 1 ohm load.

    H2OA.jpg

    Cheers
    Mister Pig
     
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  13. Poultrygeist

    Poultrygeist Lunatic Member

    Many subs are now driven by class d amps. Even though they can be quite powerful they produce very little heat. This $10 TPA3116 mono sub amp makes 100 watt and is stable into 2 ohm loads. One knob is the volume control and the other is the crossover. If you're wondering it's case is a picture frame from Ikea. :biggrin:

    P1010001.jpg
     
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  14. olson_jr

    olson_jr Beware of cake hoarders & soft shoe shufflers Subscriber

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    I have been thinking of trying a Class D amp with my ATC SCM-40's and a Cary SLP-98 pre. Been leaning towards the M700's based on reviews and they would fit my budget.


    Can I assume that you liked the M700's more than the SDS-470 ?


    Are you still using the M700's or have you moved on?
     
  15. kurtgo

    kurtgo AK Subscriber Subscriber

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    Here's what I think re: M700's vs SDS-470 - in my system it's the parts that make up the whole. Therefore, my preferred combination is with the M700's. It just seems to overall sound better with most of the different types of music I listen to. I also believe they will give me more flexibility if I go with different speakers. Given that statement though here's another impression - with my more detailed speakers obviously I'm liking the M700's; if I still had my Infinity 4.5's I think I'd prefer the SDS-470 as I believe it would help them be more "detailed" sounding while keeping their easy listening ability. So if I had warmer/darker sounding speakers I'd pick the SDS-470. For brighter/more detailed speakers I'm picking the M700's.

    The SDS-470 is up for sale, unless "Tox" says otherwise.
     
  16. olson_jr

    olson_jr Beware of cake hoarders & soft shoe shufflers Subscriber

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    @kurtgo Thanks, that is what I was looking for.

    My speakers are very detailed and certainly not warm.
     

     

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  17. Ski

    Ski what? Subscriber

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    I recently picked up a 2nd SMSL SA-98e and have put them in my system. I'm using them one per side in an active bi-amp system. I'll give them a few more weeks in the hopes they smooth out the highs and fill out the bottom a little more.
     
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  18. Poultrygeist

    Poultrygeist Lunatic Member

    One for HF and one for LF?
     
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  19. Ski

    Ski what? Subscriber

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    No. One for left (HF & LF) and one for the right (HF & LF).
     
  20. kurtgo

    kurtgo AK Subscriber Subscriber

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    Ski - what speakers are they driving?
     

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