Class-D Power Amps | The Canadian Guitar Forum

Class-D Power Amps

Discussion in 'Bass' started by Hammerhands, Mar 24, 2020.

  1. Hammerhands

    Hammerhands

    Joined:
    Dec 19, 2016
    Location:
    Winnipeg
    I have a couple of old Peavey Class-D power amps. I’ve used them for PA, guitar and bass. I never found them lacking. I also had a Peavey Databass at one time which I thought was excellent. Big clean power, I thought.

    I listen to the Guitar Nerds podcast and they seem to really dislike Class-D, especially for bass. Something about how it reacts slowly or something. On the last show I think they said, “loss of feel” about Class-D compared to a Class-AB solid-state power amp when used in a guitar modelling amp.

    What is the problem? Do you hear it?
     
    Last edited: Mar 24, 2020
  2. Budda

    Budda Gold Member

    Joined:
    May 29, 2007
    Location:
    London, Ontario
    Gotta generate clicks and conversation somehow.

    We used the mesa subway 800, and now they have the class D Fender bassman (500?). Once set up right, there was no tonal issue. Also way lighter than the svt classic.
     
  3. cboutilier

    cboutilier

    Joined:
    Jan 12, 2016
    Location:
    Halifax, NS
    For some reason I'm not as anal about bass tone as I am with a guitar
     
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  4. keto

    keto Gold Member

    Joined:
    May 23, 2006
    Location:
    Edmonton
    Some are quicker than others, sure. GK are generally quick, the Mesa D800+ was quicker than the D800. But beyond that we each like what they like, what they say is internet BS. I'm a known tone hound, and I get get great sounds with class D amps.
     
  5. KapnKrunch

    KapnKrunch Gold Member

    Joined:
    Jul 13, 2016
    Location:
    Yes
    Same here. Who cares? Its a low note providing bottom. Played bass in a couple bands. Find a spot in the mix and get feet moving.

    However, we must allow bass players the same imaginary mojo and voodoo as we enjoy. They get GAS too.
     
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  6. Hammerhands

    Hammerhands

    Joined:
    Dec 19, 2016
    Location:
    Winnipeg
    What does quick mean? Actual latency, the attack part of compression or something else?
     
  7. Budda

    Budda Gold Member

    Joined:
    May 29, 2007
    Location:
    London, Ontario
    People who are primarily bass players probably care as much as guitarists do about theirs ;)
     
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  8. High/Deaf

    High/Deaf Gold Member

    Joined:
    Aug 19, 2009
    Location:
    LM,BC,CAN
    Just on-line contrarians. They like to be different, to stand out, to get hits/attention. Like trolls, better just to ignore them, especially since they have no technical basis for their opinion, just the usually 'red is better than blue' BS.

    Class D has it's own advantages (weight, heat dissipation, efficiency) and it's own disadvantages (low to no headroom, more sensitive to low impedance loads if protection isn't built in). Like all SS amps, I think they sound fine if you are no where near clipping. And they are worse than traditional, analog Class AB amps as they get close to clipping. But you can buy so much power for relatively cheap that that should never be an issue. Just over-size them by a lot. Easy peasy Lake Lousie.
     
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  9. keto

    keto Gold Member

    Joined:
    May 23, 2006
    Location:
    Edmonton
    Fast attack, minimal 'bloom' or waiting time for a note to hit hard. That's my interpretation. So all of the above?
     
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  10. keto

    keto Gold Member

    Joined:
    May 23, 2006
    Location:
    Edmonton
    I take issue with A LOT of the 2nd paragraph. Low headroom - myth. I can pound out really big clean notes. Clipping - depends on how the power section is designed. Mesa is BUILT to clip the power section in a musical way, and they're not the only one - depending how dialed, my GK can sound miserably bad, but there's compensation built for that (use the boost, not the pre, if you want distortion), and you don't dial it that way unless you want *that* sound.
     
  11. jb welder

    jb welder

    Joined:
    Sep 13, 2010
    Location:
    Melonville, Canada
    I'll be the contrarian here and say you need the flywheel effect. It's all about the PPW (pounds per watt). ;)
     
  12. laristotle

    laristotle Gold Member

    Joined:
    Aug 29, 2019
    Location:
    acton
    I've downsized to shot knee friendly amps.
     
  13. jb welder

    jb welder

    Joined:
    Sep 13, 2010
    Location:
    Melonville, Canada
    That's a big factor, and I can see making compromises for that. But it irks me to no end when guys who swear up and down that there is no substitute for a tube amp for guitar, go on to claim it's not important for bass. :)
     
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  14. High/Deaf

    High/Deaf Gold Member

    Joined:
    Aug 19, 2009
    Location:
    LM,BC,CAN
    Non-sequitor. You pounding out really big clean notes has nothing to do with headroom - unless you are already running near clipping. It's just a fact that an amp that is running basically from wall current to audio output, with very little in storage capacitance, won't have as much headroom as one with that storage capacity. Test equipment clearly shows this.

    As @jb welder mentioned, perhaps PPW or DPW (dollars per watt) are more significant figures. If your old 1000 watt amp has 3 dB of headroom and your new switching (Class D) amp doesn't, just by another 1000 watt amp and voila, there's your 3 dB of headroom. It'll still weigh less and cost less than an old DC300A or 4B will.
     
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  15. KapnKrunch

    KapnKrunch Gold Member

    Joined:
    Jul 13, 2016
    Location:
    Yes
    Lol. Sorry for my earlier "who cares" comment, guys. I was just kidding. Of course bass rigging is critical as well. I was just displaying my ignorance.

    [And honest opinion. Still don't give a shit. You choose the gear... just play the right note at the best time. Lol. There did that smooth things over?]
     

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