Popular Post barrows Posted September 12, 2020 Popular Post Share Posted September 12, 2020 No they are not. Class D amplifiers modulate a switching output stage with an analog signal, and output an analog signal. But it also appears that there is an assumption inherent in the question that there is something wrong with digital audio? Really? Anyone who currently thinks an analog recording played back by an analog system is superior to a digital recording played back by a competent digital system is mistaken (given care in the recording and playback chains). kumakuma, DuckToller, Teresa and 1 other 1 2 1 SO/ROON/HQPe: DSD 512-Sonore opticalModuleDeluxe-Signature Rendu optical with Well Tempered Clock--DIY DSC-2 DAC with SC Pure Clock--DIY Purifi Amplifier-Focus Audio FS888 speakers-JL E 112 sub-Nordost Tyr USB, DIY EventHorizon AC cables, Iconoclast XLR & speaker cables, Synergistic Purple Fuses, Spacetime system clarifiers. ISOAcoustics Oreas footers. SONORE computer audio | opticalRendu | ultraRendu | microRendu | Signature Rendu SE | Accessories | Software | Link to comment
Popular Post barrows Posted September 12, 2020 Popular Post Share Posted September 12, 2020 2 hours ago, R1200CL said: I liked the “secret” in the in Paul’s video. Now that even Chris has become a class D owner, I look forward to what I has to say how that little amp he got performs upstairs. In Bruno Putzeys interview you can learn something about his design. He also reveal what class A amp that may be equal to class D in about 6:45. And I must say one is not a very expensive amplifier. The other is totally crazy price. Thanks for posting this interview, i had not seen this one before. Beware folks, anytime you listen to Bruno Putzeys you might actually learn something valuable about audio circuit design, and audio performance, and what you learn, just might, be in direct opposition to your own strongly held beliefs (AKA myths)! Matias, PYP, firedog and 4 others 6 1 SO/ROON/HQPe: DSD 512-Sonore opticalModuleDeluxe-Signature Rendu optical with Well Tempered Clock--DIY DSC-2 DAC with SC Pure Clock--DIY Purifi Amplifier-Focus Audio FS888 speakers-JL E 112 sub-Nordost Tyr USB, DIY EventHorizon AC cables, Iconoclast XLR & speaker cables, Synergistic Purple Fuses, Spacetime system clarifiers. ISOAcoustics Oreas footers. SONORE computer audio | opticalRendu | ultraRendu | microRendu | Signature Rendu SE | Accessories | Software | Link to comment
Popular Post barrows Posted September 15, 2020 Popular Post Share Posted September 15, 2020 5 hours ago, Rexp said: 'The only difference between analog and digital is the size of the sample rate. In the case of analog it is infinite, and for digital it is finite.' Andreas Koch Although I agree with Andreas' sentiment, in physical reality, even analog tape is granular at some level. Everything in the cosmos is granular at some level: molecular, atomic, or quantum. In that sense, there is actually nothing which is truly analog. kumakuma, Abtr and fas42 3 SO/ROON/HQPe: DSD 512-Sonore opticalModuleDeluxe-Signature Rendu optical with Well Tempered Clock--DIY DSC-2 DAC with SC Pure Clock--DIY Purifi Amplifier-Focus Audio FS888 speakers-JL E 112 sub-Nordost Tyr USB, DIY EventHorizon AC cables, Iconoclast XLR & speaker cables, Synergistic Purple Fuses, Spacetime system clarifiers. ISOAcoustics Oreas footers. SONORE computer audio | opticalRendu | ultraRendu | microRendu | Signature Rendu SE | Accessories | Software | Link to comment
barrows Posted September 17, 2020 Share Posted September 17, 2020 1 hour ago, 57gold said: Thanks Firedog - Read the article, comprehension was low on my part. Understood that the positive aspects of GaN is offset by some negatives...so they didn't want to use them in their Purifi product. Wish they would develop a higher powered Purifi module, like 400 watts into 8 ohms. Yes, sandyk, would hope the Merrill Audio stuff sound great for the freight. A lot of "audiophile jewelry" in these new designs, casework, fancy footers, contrasting metal panels, high polish...in the pricing. Give me a plain black box, and I'm good to go. Though I would like it to be significantly smaller than the DNA-500 in my music room. I do not mean to criticize the newer amplifiers from Merrill, and I have not heard them, so i do not know how they sound. But their published specifications are quite a bit worse than those of well implemented amplifiers using Ncore or Purifi modules, so there is that curiousity: if GaN was so much better, would we not expect GaN based amps to have at least equal distortion and noise specifications as Ncore and Purifi? Mr. Putzeys has stated that it is the plan to produce more powerful Purifi modules, I am sure they are just waiting a bit for sales to offset some of their development costs before they can introduce more products. SO/ROON/HQPe: DSD 512-Sonore opticalModuleDeluxe-Signature Rendu optical with Well Tempered Clock--DIY DSC-2 DAC with SC Pure Clock--DIY Purifi Amplifier-Focus Audio FS888 speakers-JL E 112 sub-Nordost Tyr USB, DIY EventHorizon AC cables, Iconoclast XLR & speaker cables, Synergistic Purple Fuses, Spacetime system clarifiers. ISOAcoustics Oreas footers. SONORE computer audio | opticalRendu | ultraRendu | microRendu | Signature Rendu SE | Accessories | Software | Link to comment
Popular Post barrows Posted September 26, 2020 Popular Post Share Posted September 26, 2020 2 hours ago, asdf1000 said: We need to see the switching freq at DSD256 rates (12MHz) ! One day 🙂 So far, I do not agree with this sentiment. I have been working with the Purifi class D modules here, trying to get the best out of them. So far they are on par, or sounding better than, any amplifiers I have heard here. The only amp which has come close (and could be considered preferable, maybe, in some areas), has been the Bricasti M-25, which is a $20K component. And I am still making improvements to my Purifi amp build. As far as I can tell, the Purifi modules themselves are as near "perfect" output stage as exists. Getting the best out of them requires designing and implementing the best input stage, power supplies, layout and wiring, as their performance appears to be limited only by the implementation. So far, the GaN amplifiers which are available, have worse measured performance than the Purifi demo set up: so I do not see a real world advantage for higher switching frequencies, at least yet, no one has produced a GaN amp which actually shows an improvement in performance. To those who seem to think higher switching rates are going to result in better class D amp performance, where are the numbers to back up this assertion, I have not seen any. fas42, PYP, w1000i and 2 others 5 SO/ROON/HQPe: DSD 512-Sonore opticalModuleDeluxe-Signature Rendu optical with Well Tempered Clock--DIY DSC-2 DAC with SC Pure Clock--DIY Purifi Amplifier-Focus Audio FS888 speakers-JL E 112 sub-Nordost Tyr USB, DIY EventHorizon AC cables, Iconoclast XLR & speaker cables, Synergistic Purple Fuses, Spacetime system clarifiers. ISOAcoustics Oreas footers. SONORE computer audio | opticalRendu | ultraRendu | microRendu | Signature Rendu SE | Accessories | Software | Link to comment
barrows Posted October 4, 2020 Share Posted October 4, 2020 As I build my own amps, I have not really spent a lot of time paying attention to the amps that are available with Purifi modules. A lot of the offerings, from say, Nord et al, appear to have less than ideal internal layouts for some weird reason. I do like the options which allow for the pro audio style discrete opamps, the pro audio discrete opamps from Weiss, for example, are very, very good. How much does all this matter, I do not know, but I prefer an amp with a logical and well sorted internal layout. SO/ROON/HQPe: DSD 512-Sonore opticalModuleDeluxe-Signature Rendu optical with Well Tempered Clock--DIY DSC-2 DAC with SC Pure Clock--DIY Purifi Amplifier-Focus Audio FS888 speakers-JL E 112 sub-Nordost Tyr USB, DIY EventHorizon AC cables, Iconoclast XLR & speaker cables, Synergistic Purple Fuses, Spacetime system clarifiers. ISOAcoustics Oreas footers. SONORE computer audio | opticalRendu | ultraRendu | microRendu | Signature Rendu SE | Accessories | Software | Link to comment
Popular Post barrows Posted October 4, 2020 Popular Post Share Posted October 4, 2020 Just common sense stuff, keep the AC input wires away from the rest of the circuitry, keep the input (XLR) and output (speaker) wire short and tight. Keep the high voltage part of the power supplies away from the output modules. My build features a separate custom linear power supply for the input stage and modulator section of the amplifier. As to mods there are million things one could try, but I would advise starting with a simple set up, to have a good baseline for performance, and then try things from there. This is an early pic of my build. I have since changed the speaker output wiring to two wires per binding post, allowing for tighter.shorter loop and better connections. And the wiring to the left rear of the chassis (temporary) has been cleaned up, shortened, and the switch to the front panel is enabled to take the amp in and out of standby mode. w1000i, Matias and motberg 3 SO/ROON/HQPe: DSD 512-Sonore opticalModuleDeluxe-Signature Rendu optical with Well Tempered Clock--DIY DSC-2 DAC with SC Pure Clock--DIY Purifi Amplifier-Focus Audio FS888 speakers-JL E 112 sub-Nordost Tyr USB, DIY EventHorizon AC cables, Iconoclast XLR & speaker cables, Synergistic Purple Fuses, Spacetime system clarifiers. ISOAcoustics Oreas footers. SONORE computer audio | opticalRendu | ultraRendu | microRendu | Signature Rendu SE | Accessories | Software | Link to comment
barrows Posted October 5, 2020 Share Posted October 5, 2020 The Purifi amp is great. I power the input board section with a custom linear power supply, this powers the input opamps, and the modulator circuitry of the Purifi modules. I am liking this amp as is, with the Purifi Eval board as the input gain stage. I will probably eventually try different input stages a well, as I suspect there could be improvements there, maybe... SO/ROON/HQPe: DSD 512-Sonore opticalModuleDeluxe-Signature Rendu optical with Well Tempered Clock--DIY DSC-2 DAC with SC Pure Clock--DIY Purifi Amplifier-Focus Audio FS888 speakers-JL E 112 sub-Nordost Tyr USB, DIY EventHorizon AC cables, Iconoclast XLR & speaker cables, Synergistic Purple Fuses, Spacetime system clarifiers. ISOAcoustics Oreas footers. SONORE computer audio | opticalRendu | ultraRendu | microRendu | Signature Rendu SE | Accessories | Software | Link to comment
barrows Posted October 5, 2020 Share Posted October 5, 2020 52 minutes ago, 57gold said: Cool. Your build layout looks great. Kind of ironic that you chose a case that has so much heat sinking when these are supposed to run very cool. Guess its dimensions help with optimal layout. Finding or building a decent chassis is one of the huge problems with DIY, unless one has some skills and access to a good machine shop it is slim pickens for nice chassis out there. I chose this one because I could get it, the dimensions were about right, and it was made in the USA with high quality workmanship and materials. The fact that it has heatsinks is not applicable to this build, as the Purifi modules are very efficient, and Hypex has improved the efficiency of the SMPS 1200 as well. Even in this case. sealed with no ventilation holes, the amp runs barely warm in a 70 degree room when blasting for an hour at 88 dB average levels. BTW, I have an NC-400 DIY in the same case, except with ventilation holes, and the Purifi runs much cooler than the NC-400. I do not think there needs to be much consideration of heat sinking with an Eigentakt stereo build with a Hypex SMPS 1200 as long as the modules are tightly screwed to an aluminum plate. SO/ROON/HQPe: DSD 512-Sonore opticalModuleDeluxe-Signature Rendu optical with Well Tempered Clock--DIY DSC-2 DAC with SC Pure Clock--DIY Purifi Amplifier-Focus Audio FS888 speakers-JL E 112 sub-Nordost Tyr USB, DIY EventHorizon AC cables, Iconoclast XLR & speaker cables, Synergistic Purple Fuses, Spacetime system clarifiers. ISOAcoustics Oreas footers. SONORE computer audio | opticalRendu | ultraRendu | microRendu | Signature Rendu SE | Accessories | Software | Link to comment
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