Likes Likes:  0
Results 1 to 6 of 6

Thread: Class D Amps to drive difficult loads

  1. #1
    Senior Member
    Join Date
    Feb 2013
    Posts
    5,762
    Post Thanks / Like
    Blog Entries
    2

    Default Class D Amps to drive difficult loads

    Does anyone have any experience of this? I have a pair of electrostatics and I'm kind of curious about what a Class D could do for them for three reasons

    1. They may be cheaper than Class A for getting quality high power amplification -- the ESLs should benefit from a powerful amp.
    2. They are greener than other Amps
    3. They are leading edge, so fun to explore.

    I don't know whether the technology can compete with the best Class A or A/B designs, in particular I believe there could be problems in treble. But I am keen to know what people think.
    Last edited by Mandryka; Jun-20-2019 at 20:27.

  2. #2
    Senior Member bigshot's Avatar
    Join Date
    Nov 2011
    Location
    Hollywood U.S.A.
    Posts
    5,877
    Post Thanks / Like
    Blog Entries
    1

    Default

    Electrostatics sometimes have very specific requirements. You should look into amps designed to work with your particular transducers and see what's available. Someone might recommend a headphone amp that doesn't work at all with your electrostatics. That would make much more of a difference than the kind of amp. I know my Oppo HA-1 has a switch in the back for high output. I don't know how common that is.
    Last edited by bigshot; Jun-20-2019 at 20:35.
    CD Sound Is All You Need: http://xiph.org/~xiphmont/demo/neil-young.html
    AES Audio Myths Seminar: http://youtu.be/BYTlN6wjcvQ
    AES Damn Lies Seminar: http://youtu.be/Zvireu2SGZM

  3. #3
    Senior Member
    Join Date
    Jun 2018
    Posts
    1,209
    Post Thanks / Like

    Default

    Quote Originally Posted by Mandryka View Post
    Does anyone have any experience of this? I have a pair of electrostatics and I'm kind of curious about what a Class D could do for them for three reasons

    1. They may be cheaper than Class A for getting quality high power amplification -- the ESLs should benefit from a powerful amp.
    2. They are greener than other Amps
    3. They are leading edge, so fun to explore.

    I don't know whether the technology can compete with the best Class A or A/B designs, in particular I believe there could be problems in treble. But I am keen to know what people think.
    I can't imagine why there would be a problem with treble. A class D amp is just extending the sigma-delta scheme commonly used in DACs to the power stage. From a theoretical point of view it seems like the most sensible way to build an amplifier in a world dominated by digital sources. But the devil is in the engineering details, I guess.

  4. #4
    Senior Member
    Join Date
    Feb 2013
    Posts
    5,762
    Post Thanks / Like
    Blog Entries
    2

    Default

    Someone said to me that distortion typically arises at higher frequencies, or can do, they’ve been often employed as subwoofer amps.

    I’d like to get some in on trial, but which ones?

  5. #5
    Senior Member
    Join Date
    Jun 2018
    Posts
    1,209
    Post Thanks / Like

    Default

    I don't have any direct experience. It seems like they are mostly used in professional audio equipment, rather than home audio. It may be that class D is only advantageous when very high power levels are required.

  6. #6
    Senior Member bigshot's Avatar
    Join Date
    Nov 2011
    Location
    Hollywood U.S.A.
    Posts
    5,877
    Post Thanks / Like
    Blog Entries
    1

    Default

    Distortion can occur in different ranges. It's just most noticeable in the upper midrange / low end of treble (2 to 5kHz) where our ears are most sensitive.

    The places I've seen class A amps used most is mic pres. I don't know if they are common for headphone amps, but they aren't at all common with speakers. Different kinds of amps have different uses. None are better than the others. It is drop dead easy to make an audibly transparent headphone amp, so I don't see a reason to spend a lot of money on one. For microphones, where the level may be boosted a lot in the mix, they are most useful. Good mic pres are VERY expensive.
    Last edited by bigshot; Jun-21-2019 at 01:40.
    CD Sound Is All You Need: http://xiph.org/~xiphmont/demo/neil-young.html
    AES Audio Myths Seminar: http://youtu.be/BYTlN6wjcvQ
    AES Damn Lies Seminar: http://youtu.be/Zvireu2SGZM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •