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Cable Guru

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  1. Thanks for your detailed and helpful response esldude. Our file synchronization techniques have included sub-sample synchronization and multiple passes, but they're still evolving as we progress. In some of our tests, we've been able to eliminate clocking errors by running both the bypass and the cable in the same pass. Even then, sub-sample synchronization may be required to compensate for the cable delay. David
  2. Digital differencing is a relatively new technique and only a few papers on it have been published so far. We are currently refining our procedures as we work toward our goal of publishing them and encouraging others to duplicate our results. We are also working on improvements in double-blind listening tests. All of our tests utilize the only appropriate control (reference) for cable testing, a bypass. Since esldude has already been performing differencing tests, I wish he would share his procedures and any successful results with us, so we all may benefit from that knowledge. David Salz "The greatest impediment to discovery is not ignorance but the illusion of knowledge" - Danial Boysten.
  3. My point is that no cable (a bypass) is the reference (no loss) and if generic cables match the performance of a bypass in your system, then upgrade cables cannot make improvements.
  4. Thanks for all of the interesting comments and questions. We believe that the error waveforms shown in our graphs are purely the result of USB cable losses and triboelectric noise which interfere with the function of the DAC and the others we've tested. I'm not aware of anyone else performing cable bypass differencing analysis with USB or other types of cables. I don't believe that swapping cables is useful in determining their effects in the lab or in listening tests. According to accepted science, a perfect cable is no cable at all. Likewise, my answer to the length question is that I have always found shorter lengths to have better fidelity. We test speaker cables by connecting mono amps directly to the speakers and we compare that sound to standard lengths of cable. We also compare speaker cables to equivalent value resistors and those results are comparable to the bypass comparisons. In both cases, the cables reduce the quality and quantity of information that we hear. If generic cables pass this test on your system, with your best recordings, then upgrade cables cannot improve your fidelity. However, nearly everyone we know of who has tried cable bypass testing has discovered that they hear the losses caused by cables. My job is to create cables that minimize those losses, both audible and measurable. David Salz
  5. The errors shown are the differences between each cable and the reference bypass, since we only want to see and hear the losses caused by the cables. The tests are being performed by a major university with an advanced audio engineering program to avoid the possible mistakes mentioned by those who've commented. The procedure included file synchronization to produce the minimum error signal, however we are still developing the protocols that will be utilized in the detailed white paper we are preparing. I'm surprised that no one has commented on my suggestion to try cable bypass listening comparisons in your own systems. If a generic cable sounds the same as a bypass in a particular system, then there would be no benefit in replacing it with an upgrade cable. The problem is that generic cables usually sound compressed and filtered compared to a bypass. While I readily admit that the upgrade cable industry is mostly about the look, the story and the packaging, I design cables with improved waveform fidelity and lower noise to minimize audible losses, thereby increasing musical enjoyment. David Salz President Wireworld Cable Technology
  6. Thanks for all of the interest in our waveform differencing paper. The measurements and waveform differencing results contained in that piece were produced by Professor Colby Leider, director of the music engineering department at UM. His position was formerly held by Ken Pohlman. The test source was Colby's Macbook Pro. The DAC was a Bel Canto DAC3.5vbs with uLink asynchronous input module. The test signal included 24/96 music and test signals, including a series of impulses used for synchronization. The error waveforms presented were created by recording the output of the DAC and analyzing the resulting 24/96 wave files in Matlab. We will make the files available to the public within a few weeks. The reference signal was created using a USB bypass adapter made by soldering USB A and B connectors back-to-back. The standard USB cable was a Belkin Silver that was thoroughly tested for defects. I've been using various types of bypass jumpers throughout my 30+ years of developing cables through bypass listening tests. In fact, I only decided on this career after a bypass test proved to me that cables are audibly lossy and poorly understood. I encourage anyone with the appropriate skills and equipment to duplicate this waveform test as well as cable bypass listening tests. David Salz President Wireworld Cable Technology
  7. I've been utilizing bypass testing (including double-blind tests) to learn how to produce cables with lower audible losses for over 30 years. The only technically correct way to find out if cables have audible losses is a bypass test on a quality audio system. For example, you can dock mono amps directly to your speakers and compare that sound to the sound you get through your speaker cables. You will learn that cables do have audible losses and that they are often not subtle. I recently published a short piece on the measurable losses of USB audio connections, which can be found at the link below. It was produced as part of our ongoing research at the University of Miami. http://www.wireworldaudio.com/ProdLit/WCT_WP_Wave.pdf David Salz President Wireworld Cable Technology
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