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Found 6 results

  1. Could this new class D module from Bruno be the one to finally silence all the naysayers? The specs looks crazy. Any thoughts from the higher ups here? https://6moons.com/audioreview_articles/purifi/ https://www.purifi-audio.com/eigentakt/
  2. Taken second-handed from someone who posted the following from an Absolute Sound Roundtable of master amp designers on class D: Bob Carver "I built many of them right here in my own laboratory with the thought they could and would fulfill that final promise.... I was never able to build a Class D amplifier that sounded as good as a linear one." John Curl (Parasound, CTC, Vendetta Research, Constellation) "Some version of hybrid Class A/D looks like the future in optimum audio design." Cyrill Hammer (Soulution Audio) "If you want to have your product performing at the cutting edge it is not possible with today's known switching technologies. In order to come close to the performance of the best linear design we would need high-current semiconductors that provide switching frequencies of several MHz or even GHz." Lew Johnson (Conrad Johnson) "I tend to think that Class D circuit design is an approach best relegated to producing low-cost, physically manageable multichannel amplifiers where one might accept some compromise in sound quality for the sake of squeezing five, six, or seven 100 watt channels into one moderate-sized package for a budget home-theater installation." Vladimir Shushurin (Lamm Industries) "No, it is not. And I would like to respond to the second part of this question with an allegory. Any field of human activity defines a number of requirements which, when properly implemented, guarantee a positive outcome. For example, the basic requirement in the army and sports is an able-bodied individual. So, it would be quite natural to concentrate on searching for such an individual (especially as we know where to find him). However, out of the blue we decide to choose a feeble-bodied person who, on top of that, is encumbered by various diseases. Having made this decision (which is a priori improper) we start justifying it to ourselves and others by citing the great state of our medicine, which is capable of curing many ailments." (Savage! -- GUTB) Fumio Ohashi (BAlabo) "No. Class D can't really be considered for super-high-end performance in its present stage of development, although it can be fine for mid-market products." Nelson Pass (Pass Labs) "Does a $10 bottle of wine compete with a $100 bottle? Of course it does, and it often wins based on price. Right at the moment Class D designers seem to be still focusing on the objectively measured performance of their amplifiers. I expect that at some point the economics of the marketplace will encourage them to pay more attention to the subjective qualities, and then they will probably play a greater role in the high end." (Most diplomatic -- GUTB) Jürgen Reis (MBL) "I have worked a lot lately with Class D. Ninety-nine percent of Class D circuits are not competitive with linear circuits. Most Class D sounds sterile. It's tricky to figure out what to do to compensate for that." Thorsten Loesch (iFi - AMR) "I have yet to hear a pure class D Amp I’d rate above "below average for solid state" (which is not very high performance). In a little update of my classic 'Valve Analogue Stages for DACs' I wrote: "Perhaps more crucially, so called Class D Amplifiers, which have in recent times sprouted up like mushrooms after a warm rain, continue to use the straight two or three level modulation scheme described above. And thus they still require the use of heavy handed noise shaping to attain anything like acceptable 16 Bit Audio performance.The clock frequencies for these amplifiers are usually at 300 KHz to 1MHz in the best cases. That is 3,000 to 10,000 times lower than what is required to attain 16 Bit / 44.1 KHz performance without noise shaping and other forms of signal manipulation! And again, one is baffled and perplexed by the rave reviews many Class D amplifiers receive, as baffled as one was about the late 90s reviews of timeslicing DACs. The best of breed I have auditioned were certainly not bad; however in direct comparison to the best available valve and solid state amplifiers they do not produce a very good sound. Well, at least they offer novelty and the reviewers something to write about other than another (however good sounding) 8 Watt valve amp. Incidentally, the best sounding Class D amps tend to be really low power single chip devices (putting out little more than the 8 watt valve amps), presumably because they are faster AND because they always work near what one might call a full scale, if they would be DACs. On second thought, they of COURSE are DA Converters and where a Class D amplifier accepts analogue input directly it is an A2D converter followed by a power D2A converter! What an insight!?" Mark Levinson "Interleaving of multiple Class D Amplifiers is potentially a step in the right direction, but does not go far enough.Personally I think that the best option would be something that combines a Class D Amplifier for the heavy lifting with something Class A for fine detail. Probably implemented in the style I did for AMR’s AM-77 "Jikoda" Style. In this case both of the circuits involved can operate fully open loop. In many ways the problems in Class D Amplifiers are analogous (but not identical to) those in Class B Amplifiers (but without an option to implement Class AB or Class A) so similar solutions apply. All Class D amplifiers are essentially delta-sigma DAC’s. If the input is not digital PWM signals (aka "DSD") but analogue audio then it is also a Delta Sigma Analogue to digital converter...Now DSD (aka SACD) which to my ears fails to come close, never mind equal true PCM CD Replay in most aspects of sound quality, operates at 2.8MHz switching, or around 10 times as fast as common Class D Amplifiers...Why anyone would want to listen through an A2D followed by an D2A Converter that are around 10 times worse than single speed DSD is beyond me. But with enough hype and snazzy naming it cannot help but sell high and wide." And, don't worry, we haven't forgotten: Jeff Rowland "I consider Class D to be highly competitive in the present, and to offer an evolutionary pathway of audio design that may produce even more astonishing results in the future."
  3. Hello! Has anyone had experience of Hattor Audio amps? They seem to be an integrator of Hypex and make some beautiful looking HiFi (passive pre-amps, integrated amps etc)? Best Simon http://www.hattor.com Not on the website, but on eBay: http://www.ebay.co.uk/itm/Hattor-Audio-Ncore-Hypex-Monoblocks-700W-4R-/122462508863?hash=item1c8355973f:g:g48AAOSw5UZY~h0c For sale this great mono amplifiers based on fameous NCore NC500 modules and SMPS1200 power supply. Full balanced design with custom made buffer with very highend parts used: Dexa NewClassD opamps, AMTrans resistors, Hypex HNRsuperregulators. We dont use fast connectors from the power module to buffer - we solder it direct for better sound. Hattor monoblocks use latest nCore™ amplifier technology licensed from Hypex to provide a nearly ideal amplifier with distortion below measurement, ultra-high damping factor, and unconditional stability with any speaker. Tight, detailed sound with amazing control and transparency gets the best performance available. Specification: Output power: 400 W/8 ohm, 700W/4 ohm, 550W/2 Ohm Gain: 26 dB Signal/Noise Ratio: 125 dB Distortion (THD, IMD): 0.001 % Input Impedance: 1M ohm Output Impedance: 0.005 ohm Frequency Response: 2Hz – 50kHz 0/-3db Speaker connection : Pure copper patented Hattor spaker terminals Wiring : Silvered copper wires Dimensions: 90 x 260 x 250 (H x W x D)
  4. I subscribe to PS Audio’s mailing list and I got this in my inbox yesterday. What do you think about this integrated? ” For Immediate Release Contact: Bill Leebens, Director of Marketing (941) 807-7880 PS Audio Launches Sprout100! Next-generation Sprout doubles the power, adds features Boulder, CO: 5/6/2018--- PS Audio is proud to announce the availability of Sprout100,the next generation of the popular, award-winning Sprout integrated amplifier. Sprout100 preserves the styling and compact form-factor that endeared the original Sprout to critics and thousands of owners worldwide over the last four years, while improving the performance and functionality of every element of the original. Sprout's signature features remain: a built-in DAC, Bluetooth, phono preamp, headphone amp, power amp. Revised topologies improve the noise levels and dynamic capabilities of the phono pre and the headphone amp; the Sabre 9016 replaces the previous Wolfson DAC and improves linearity; and the latest, state-of-the-art ICEpower modules provide stunning sound quality and dynamic impact. In addition, Sprout100 features: An upgraded amp capable of 50 wpc into 8Ω and 100 wpc into 4Ω A fully asynchronous DAC that can handle 384/24 PCM or double rate DSD A dedicated subwoofer output An optional bass boost A remote control Analog RCA inputs and outputs TOSLINK optical input Continuing the PS Audio and Sprout tradition of high performance combined with extreme value, US MSRP is set at $599. Units will begin shipping in May; sales will be direct from the PS Audio factory as well as through Amazon and selected dealers. Review units are presently available. About PS Audio: Founded in 1973, PS Audio has a worldwide following and a reputation for designing and manufacturing innovative, high-value, leading-edge audio products. Our design and core manufacturing facilities are in Boulder, Colorado, at the foothills of the Rocky Mountains. While our engineering staff is second to none, PS is not constrained by NIH Syndrome: recent products have included design input from industry gurus Ted Smith and Bascom H. King. We invite you to sample CEO Paul McGowan's Daily Posts and Copper, the Magazine of Music, Audio, and the Good Stuff, published every two weeks. www.psaudio.com Paul’s Daily Posts PS Audio Community Copper Magazine ”
  5. I admit I am a bit slow on the uptake, with these forums. I posted the question, "Can a chip amplifier sound as good as regular amp?" but I thought the thread was the Computer Audiophile on the Cheap thread--it was the DAC thread... ooops. Anyhow, that drew a number of folks into a exchange of ideas, and at last count, 11 pages of responses. I learned a lot from the experience. My $40 Nobsound Class D amp doesn't sound as good as the h/k 330i, so the answer is: 'No, not for $40.' I did find another USA manufacturer in Class D and read about a 699 GBPound unit from Britain. All in good fun. On this thread, my goal is to talk about not how MUCH a good sounding stereo costs, but rather, how good of a sound can I get out of the stereo I have. Not my original idea, I think it was expressed by folks at Schiit. I like their Modi 2 DAC for $99. That means anyone with a computer, an amplifier/receiver, and a pair of decent speakers can start hearing music differently. Computer Audiophile on the Cheap is a lifestyle. Hugh Hefner popularized the Playboy mystique. We aren't that glamorous. We talk about the iFi iPurifier2 with it's100x noise cancellation, stolen for civilian audiophiles from Military components used on fighters...I guess since they have a picture of a jet on the box. At $109, it is rated as a a "MUST BUY" Accessory if a computer is part of the signal path. Folks, you don't have to mortgage the children's future with a home stereo system. You can really enjoy music, knowing you did it on the Cheap...And it sounds better than you can ever recall hearing the music.
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