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About atmfrank

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  1. From my experience, the negative impact of longer cable runs is higher with USB than with analog RCA. My example is the use of a cheap 3 Meter USB cable to connect a Macbook Pro to a Gustard X20u DAC. At the max sampling rate of 384kHz PCM I am getting occaisional drops, which is annoying and concerning. My concerns is with the induced noise from the extra length and subsequent jitter. I currently have an iFi USBPurifier or Jitterbug in the signal path, which doesn't seem to eliminate the drop problem. With a long RCA cable run you might deal with other degrading factors. I tend spend my audio $$'s wisely and before plunking down any hard cash, I want to know more. The great USB cable debate is useless, sometimes informative and mostly loaded with ego-driven opinions by people who claim to have the authorative answer. There isn't one right or wrong answer, because there are too many variables involved. I finally (just now) decided to buy an AQ Carbon series for a 3 meter run ($249), mainly because I merely want to eliminate the possibility of excessive jitter *and* to not let my sense for audio aesthetics dictate what the rest of the living room looks like. The equipment stays where it is and I will solve any problems with better interconnects. I like fast and accurate bit streams. Hope this helps.
  2. Coming to this read very late. I have been accused being a walking music lexicon, having started with The Beat Club on B&W German TV in the 60ties. From all the countless music recordings I have listened to in every imaginable format since then, there are still only a handful good recordings that stand out. The articles mentions a few. But compression is just one of many problems that make music less enjoyable, or in some cases unlistenable despite brilliant music artistry. I hate to say it, and it is really not my preferred music style at all, Jazz in the Pawnshop is a prime example where the sound is "right", DR included (I have no idea what the actual rating is). The reason for the good sound is the simplicity of the recording method, a few Neuman U47 in perfect "stereo" alignment, plus KM56's for the piano, Studer mixer, NR unit and two Nagra tape recorders. Multi-track recording of rock music is obviously a different beast, but I still believe that simplicity should be the first order to generate a truely acurate and engaging image of a recording session. It starts at the source, where the music is recorded, live on stage or in the studio. Everything downstream just adds a level of alteration of the orginal sound. The MQA folks have a point wanting to retain control over the entire downstream until it hits our ears. Interestingly, I find examples of superior DR in some of today's EDM productions, completely electronically generated with sophisticated software that allows the artist to maintain complete control over the music recording and mastering process. Just because of this, I like to listen to pounding, high DR musical EDM content on streaming Internet radio stations, in 24bit/96 FLAC format. Straight from the horse's mouth, unaltered and enjoyable. Cheers,
  3. I am not a fan of hateful, and in the case, unqualified opinion. What exactly is the specific experience with Audio-gd that leads Peggy to write such rubbish? I have one Audio-gd product in my stack, the compact Precision-3 power amp for a secondary system. Since it's unrelated to the content here, I will only say this: it is a high-quality product for a bargain price with excellent and responsive support and amazing sound. If you want to read a reliable review of their R2R DAC, go here: http://www.6moons.com/audioreviews2/audio-gd/1.html
  4. @med_designer The DAC in reference is an Audiophonics I-TDA1387 custom design for Raspberry Pi. The board itself is ridiculously inexpensive (€60 +s/h). I am using it in combination with a KALI I2S re-clocker board from Allo, which is supposed to reduce jitter errors by replacing the RPI clock source. There is a plethora of blogs discussing the various technical aspects of DIY/Raspberry based designs (a good one is Archimago's Musings and of course @opus101), but in the end, I let my ears do the judgements. It is very intriguing to follow the DAC/digital design developments over the years, now going back to design choices that simplify the processing with a reduced component count. Yes, of course, this isn't always the best choice, but a good starting point. I am equally intrigued by the design work behind Shiit and Chord (for example) and I am sure readers here have good opinions about their favourite products. BTW, I think the Audiophonics board comes from the same Chinese source (TeraDak, TDA1387). The only difference, one less parallel filter stage, smaller board, same components. To be had for $23 +s/h on Ebay. The audible results are very close to the Audiophonics board. Be amazed.
  5. I am a proud owner of a low-budget R2R NOS DAC setup involving a TDA1387 setup with Raspberry base. I find it amazing how the sound quality appears to be more pleasing than many sigma/delta based DAC's. I compare it with ES9018 based designs ($1k range). The tech specs of the TDA1387 don't suggest superiority, but in the end, the audible results matter more to my ears. Huge soundstage, high resolution but vinyl-like warmth, high dynamic. The circuit design appears very simple with 2x4 1387 chips in series. Music listening range is from acoustic jazz, classic/prog/alternative rock, EDM, electronica and it all sounds addictively better. (Other equipment: McCormack pre-amp/amp, Dynaudio, Gustard X20u, Chord Mojo, Dragonfly, Sennheiser 660s, Grado RS2e)
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