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Thread: Class D

  1. #41
    Join Date: May 2008

    Location: Surrey

    Posts: 6,135
    I'm Rob.

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    Googling the Nuprime STA-09 does not seem to reveal which ClassD chipset it uses. I found an internal pic and the board looks like it could be an IRS2092 board. Anyone know?

    My next amp is a Sure version of the IRS2092 (250w into 4 Ohms) and has a switch on the board to bridge it. I now have the transformer for this and I will report back. The board is not dissimilar to the Nuprime board, although the inductors on the Nuprime board are different.
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  2. #42
    Join Date: Aug 2012

    Location: South Beds, UK

    Posts: 1,151
    I'm kickinbacklistenintotchoons.

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    Quote Originally Posted by montesquieu View Post
    a really good valve amp does music better, as perhaps do some of the higher-powered Class A solid state offerings from Nelson Pass and those working in a similar vein.
    Funnily enough, I have a Nirrvana Electronic Works (N.E.W.) A60.1 winging its way to me. It's a 60W dual mono Nelson Pass design. Looking forward to it.
    Mike (that's me)'s stuff -

    Analogue: Technics SL-10 / 310MC & SL-7 / EPC-P202C, Remton 383 MkII phono
    Make music louder: TVC pre, Nirvana Electronic Works A60, 60W / Ch Class A power
    For when there's no Analogue: Doge 6 CDP
    To discover loads of new music: Spotify into foo'd Xiang Sheng DAC-01A
    Music boxes: Heco Celan 300
    Cleaning duties: Okki Nokki 2

    Y'know, sometimes, Satan, come as a man of peace.

  3. #43
    Join Date: May 2016

    Location: north wales uk

    Posts: 233
    I'm peter.

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    hi i have just bought a class D amp off here , which has turned out to far better than the MF M6500 i owned before , it is a lot more clear and tight bass, it is worm sounding , can be very fast to listern to with rock , the module being a Mpro2, which i believe you cannot buy unless you are a OEM ,the only problem is the out put of 800watt pc , into 4ohms so i have to watch how loud it is played,
    the Module is the same as in the Gato 400s,(nearly 4K ) but set up just as a power amp ,the sound is not like any other class D amp i have listerned too, it is not bright at all, it is great at vocals ,sound stage is fantastic , with a distortion of .003 and the pre amp having a distortion of .005 the michell orca pre has turned out to be a good match for the power amp ,

  4. #44
    Join Date: May 2008

    Location: Surrey

    Posts: 6,135
    I'm Rob.

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    It's a shame that Pascal do not reveal the make of the chips used in these amps. I have had great results lately with IRS2092 based Class D amps....however it is anyone's guess as to what powers the Mpro2.
    Buy Bose...And get your parking validated!.

  5. #45
    Join Date: May 2016

    Location: north wales uk

    Posts: 233
    I'm peter.

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    Hi gato alter the Module , but as far as i can see on the gato site not much is done to Mpro-2 just add the pre amp and the usb , wireless stuff , which i did not need , the Michell Pre amp is perfect for the power , the gain on the power being slightly lower then the pre , i am about 40 lps into listerning to this amp , i am well impressed, less distortion than the class A amp , with less electric used to listern to the hifi , which will never need the 800watt pc , into the quad z4 , Pascal were very helpful , to a point but no real advice as there is a point on the board that a fan can be fitted to keep any heat away ,
    they refused to help in any way with this, just saying the do not supply to the DIY market , and were /who did i buy the module off , and that is were it was ended, i did get another diagram which i did not under stand , so i just put that to one side, the module is $350 if you are a oem, so why does it cost 4k for a class d amp ?
    Last edited by gwernaffield; 20-05-2018 at 18:57.

  6. #46
    Join Date: Oct 2011

    Location: London Town

    Posts: 2,109
    I'm Julian.

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    Quote Originally Posted by montesquieu View Post
    I have one too and it's very good in lots of ways. I also briefly owned a NuPrime STA9 (2 x200w though it can be monoblocked) which I thought was excellent for the money (about 900 IIRC) and I really would love to try out a monoblocked pair of them sometime with the Tannoys - my suspicion is this would be very impressive indeed, although a single amp fell short of really providing the deep emotional connection I provided by a good push-pull valve amp like a Radford STA25 or 100, EAR 816, or Leben CS-1000P, all of which I've had driving my Tannoys at some stage.
    Hi Tom, just catching up with this thread ... I'm interested in trying Class D with my Tannoy HPD's but am wondering what you thought of the NuPrime in terms of bass grip?
    The Source - Kuzma Stogi - AT33 PTG/II - Fidelity Research FRT-3 - Conrad-Johnson EV-1 - Consonance Cyber 222 mk2 - Philips DC380 - Shanling CD-S 100 MK 11 - Toshiba ST-420 - Tannoy Chatsworths

  7. #47
    Join Date: Aug 2012

    Location: South Beds, UK

    Posts: 1,151
    I'm kickinbacklistenintotchoons.

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    Quote Originally Posted by Puffin View Post
    It's a shame that Pascal do not reveal the make of the chips used in these amps. I have had great results lately with IRS2092 based Class D amps....however it is anyone's guess as to what powers the Mpro2.
    I'm still absolutely loving my IRS2092 based Class D Amp, 6 months later, which is unheard of for me, being a bit of a box swapper
    Mike (that's me)'s stuff -

    Analogue: Technics SL-10 / 310MC & SL-7 / EPC-P202C, Remton 383 MkII phono
    Make music louder: TVC pre, Nirvana Electronic Works A60, 60W / Ch Class A power
    For when there's no Analogue: Doge 6 CDP
    To discover loads of new music: Spotify into foo'd Xiang Sheng DAC-01A
    Music boxes: Heco Celan 300
    Cleaning duties: Okki Nokki 2

    Y'know, sometimes, Satan, come as a man of peace.

  8. #48
    Join Date: Feb 2010

    Location: Berkshire, UK

    Posts: 3,163
    I'm Tom.

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    Quote Originally Posted by julesd68 View Post
    Hi Tom, just catching up with this thread ... I'm interested in trying Class D with my Tannoy HPD's but am wondering what you thought of the NuPrime in terms of bass grip?
    Plenty of bass grip - no issue there. Just a bit of a lack of emotional connection. I'm told the ST10 is an improvement, I've twice tried to buy one of these second hand from Norway (there's a dealer up there) but for whatever reason they have been reluctant to ship. I'd stop short of recommending a single STA9 vs a valve amp of comparable price, though I have heard reports it all kicks up a notch if you monoblock them (that comes to about the same price as a single ST10 though so it getting away from being a 'cheap' option, you'd get a fully serviced Radford STA25 for that).
    Main: Speakers 'RFC' Tannoy Canterburys / custom crossovers; Amp - Radford STA100; Pre EAR 912; Vinyl: Thorens TD124 MkII + Ikeda IT345-CR1 / Ikeda IT-407 tonearms; Cartridges Stereo - Miyajima Madake, Ortofon SPU Royal N, Ikeda 9C III, SAEC/Excel C3; Mono - Miyajimas - Zero 0.7, Premium 1.0, Sonovox MC-4 1.0, Edison '78' 4.0 conical, and Shure M44 strapped for mono with several Expert Stylus conicals for different eras of 78s; Phono stage and SUT from EAR 912; Esoteric Sound Re-Equalizer for equalisation of early mono and 78, switchable in from tape loop; Digital: Audio Note CDT2/II transport, heavily modded AN Kit DAC + Mutec MC3+USB.

    Study: Speakers - Tannoy DC6; Amp: Pass Aleph 'Mini'; preamp - Firebottle custom; Vinyl: Garrard 401 with AT1503 tonearm and vintage Ortofon SL-15e with matching Ortofon 2-15k SUT; Phono Stage: Firebottle Plus; Digital - Trichord Genesis III CDP + Arcam rBlink; Schiit Multibit DAC.

  9. #49
    Join Date: Oct 2016

    Location: London

    Posts: 79
    I'm David.

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    I tried my Nord Class D One Up amp with Westlower's 12ins Tannoys and we all thought it was rather good. IMO it sounded 'better' at the top and bottom of the frequency range than a Radford STA25. However, the same amp sounds much less impressive with my Tannoy Canterburys......so even Class D with its promise of extreme flexibility is system /speaker dependent. Interestingly, the Nord is rated at 700watts into 4ohms but in practice sounds no louder than my 50 watt 845 mono blocks........
    David

  10. #50
    Join Date: Apr 2008

    Location: Cheshire, UK

    Posts: 2,629
    I'm Clive.

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    Quote Originally Posted by AD Audio View Post
    I tried my Nord Class D One Up amp with Westlower's 12ins Tannoys and we all thought it was rather good. IMO it sounded 'better' at the top and bottom of the frequency range than a Radford STA25. However, the same amp sounds much less impressive with my Tannoy Canterburys......so even Class D with its promise of extreme flexibility is system /speaker dependent. Interestingly, the Nord is rated at 700watts into 4ohms but in practice sounds no louder than my 50 watt 845 mono blocks........
    David
    Class D has no headroom vs a Class A or A/B. Your 50W 845 will sound louder than a typical 50W solidstate amp. 700 Class D watts sound like a lot (it is) but they are probably more equivalent to nearer 300W vs a typical solidstate amp. That's my take on FWIW.
    TT 1 Trans-Fi Salvation with magnetic bearing + Trans-Fi Terminator T3Pro + London Reference
    TT 2 Garrard 301 with NWA main bearing + OL Encounter mkIII + Ortofon 2M Mono SE
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