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Thread: Class D come of age - Coherent amplification

  1. #1
    Join Date: Oct 2012

    Location: The Black Country

    Posts: 5,066
    I'm Alan.

    Default Class D come of age - Coherent amplification

    As a techie I have sort of been following the evolution of 'digital' or class D amplifiers.
    I know there are now some very good examples but I haven't heard any, until now.

    During my recent visit to Coherent Systems I had the privilege of experiencing Tony's latest power amp, as yet unreleased.
    It has some amazing specs (20nS rise time, 100A instantaneous current delivery) but what does it sound like?

    The short answer is nothing. Zip. Nada.
    By that I mean the music is just there in front of you. Loud or quiet, any genre just music.

    Forget valve or solid state. Forget analogue or digital. Forget pixie dust or massive heatsinks - this amp is very efficient

    This is the realisation of 'straight wire with gain', the rather wonderful line that Peter Walker came up with.
    Fantastic doesn't cover it.


  2. #2
    Join Date: Apr 2012

    Location: Southall, West London

    Posts: 41,102
    I'm Geoff.

    Default

    I can believe that Alan.

    I have my cheapo TPA3116 in the system as my main amp at the moment and can't fault it. The valves, Quads and Sugden etc are taking a holiday.
    "when common sense, logic and plausibility are excluded. All that remain are foolishness and lies"

  3. #3
    Join Date: Jan 2008

    Location: Forest of Dean, Glos

    Posts: 11,347
    I'm Jerry.

    Default

    Interesting.
    I've heard a fair few class d amps and while there was a wide range of presentations and excellence they all had a characteristic smoothing over of the finer details.
    I guess the Coherent amps have overcome this?
    Jerry

    i. Internet streaming > Audiobyte Black Dragon DAC > Marantz HD-AMP1 > MBL 116F speakers
    Cables : Wyreworld Starlight USB, Epiphany Atratus III interconnect, Tellurium Q Silver speaker.
    USB signal pampering : Wired4Sound Recovery & Halide Bridge.

    ii Internet streaming > Audiolab MDAC > Marantz HD-AMP1 > Infinity Cascade 9 speakers & Jamo SUB200

  4. #4
    Join Date: May 2016

    Location: Gloucestershire

    Posts: 549
    I'm Ian.

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    I've got a Rogue Audio Sphinx 2 which has a valve pre and class D (Hypex I think) power stage. Very happy with the sound and find it very funny when folk who have been listening quite happily to my system suddenly look as though someone in the room has farted when I tell them it's Class D!

  5. #5
    Join Date: Oct 2012

    Location: The Black Country

    Posts: 5,066
    I'm Alan.

    Default

    Quote Originally Posted by jandl100 View Post
    Interesting.
    I've heard a fair few class d amps and while there was a wide range of presentations and excellence they all had a characteristic smoothing over of the finer details.
    I guess the Coherent amps have overcome this?
    And some. Best sound I have ever heard.

  6. #6
    Join Date: Oct 2012

    Location: The Black Country

    Posts: 5,066
    I'm Alan.

    Default

    Quote Originally Posted by ianlenco View Post
    ... when folk who have been listening quite happily to my system suddenly look as though someone in the room has farted when I tell them it's Class D!
    That's class Ian

  7. #7
    Join Date: Sep 2009

    Location: west mids, UK

    Posts: 2,351
    I'm Phil.

    Default

    wow , i had a pair of tony [ coherants ] ref 1000 modded amps and they were superb . much better than the previous ref 1000 . had many things off tony over the years and glad you could get down there . i miss his place in malvern and ripple

    he has a renovated pair of belles mb200 which are beautiful amps . had some before the msb , be interesting to compare them to the fb hybrid monoblocks
    1]bel canto pre 3 vbs /, /rotel cd/ bel canto fm1
    sonos, . tannoy eaton legacy 2]arcam a75 marantz sa8005 jolida modwright dac and RFC impulse ta`us , track audio stands

  8. #8
    Join Date: Sep 2009

    Location: west mids, UK

    Posts: 2,351
    I'm Phil.

    Default

    myself and deggie were listening to a little topping on monday with some p3esr and it did not sound bad at all


    23 watts and 55 quid s/h !!!
    1]bel canto pre 3 vbs /, /rotel cd/ bel canto fm1
    sonos, . tannoy eaton legacy 2]arcam a75 marantz sa8005 jolida modwright dac and RFC impulse ta`us , track audio stands

  9. #9
    Join Date: Jan 2008

    Location: Gerrards Cross

    Posts: 2,376
    I'm Tony.

    Default

    Alan brought with him his Firebottle mono's, which in fairness where very good, they drove the Quadral Galan's really well and sounded very good considering the cost, a real bargain imho.
    Coherent Systems
    Real high end sound with musicality not hifi

  10. #10
    Join Date: May 2016

    Location: Notts

    Posts: 2,261
    I'm Geoff.

    Default

    I am convinced that class d is the way forward and that there are several current amps using this technology which can compete with the best in other classes. I speak as the owner of a very nice valve amp and beefy class a/b amp, as well as various "chip amps", class t designs and so forth.

    As an additional consideration, and from an environmental perspective, I feel very guilty these days about the inefficiency of valve and class A designs, even though the SQ may be great.

    Geoff


    QUOTE=Firebottle;1053070]As a techie I have sort of been following the evolution of 'digital' or class D amplifiers.
    I know there are now some very good examples but I haven't heard any, until now.

    During my recent visit to Coherent Systems I had the privilege of experiencing Tony's latest power amp, as yet unreleased.
    It has some amazing specs (20nS rise time, 100A instantaneous current delivery) but what does it sound like?

    The short answer is nothing. Zip. Nada.
    By that I mean the music is just there in front of you. Loud or quiet, any genre just music.

    Forget valve or solid state. Forget analogue or digital. Forget pixie dust or massive heatsinks - this amp is very efficient

    This is the realisation of 'straight wire with gain', the rather wonderful line that Peter Walker came up with.
    Fantastic doesn't cover it.

    [/QUOTE]

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