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One and a half

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About One and a half

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  1. Soldering on Low Voltage at the connections is very much frowned upon these days, favouring crimped connections, what evidence do you have that soldering is used on most manufactured cables, or is this just shooting from the hip?
  2. Please provide then real science why AC cables from different manufacturers should not make any audible difference.
  3. That system attests to iFi's ISO9001 certification that they could trace a faulty component installed in a batch. Most likely dealers don't record serial numbers, even less customers sending in warranty cards, so a recall was a reasonable method to haul in the suspected models. Looks like a supplier substituted a reference part with something different (cheaper) that affected the operation of the whole unit. Nothing unusual given cutting corners today.
  4. That's the issue, the sharks can't hear the difference, then ridicule those that do. The thread then spins out of control into a bitching mess.
  5. This thread is a lagoon full of sharks circling for the first post from someone who can detect differences between power cables and the water will turn red.
  6. Of all the streamers that have a USB output only, before purchase, check that the USB output is compatible with the intended DAC. Despite the same connector, the drivers are the most important, especially with native DSD support. Linux is the major OS in a streamer, "Linux solves everything" is a mantra often heard, however Linux doesn't. My Playback Designs MPD-3 DAC just wouldn't work with the USB out from a Bricasti M5 (tested 2018), so once bitten, the memory of that trauma sticks, just passing the experience on. A better guarantee of a workable solution is 'old' fashioned S/PDIF, either AES (preferred), Coax or Optical. DSD would need to be converted by the player software, which these days is not so problematic. Despite being old, S/PDIF works and works well, have no complaints as far as imaging and tonal quality is concerned.
  7. Topic ignored, TAS does nothing for me; never has, so nothing’s new.
  8. And not gain anything?
  9. Perhaps the definitions are lacking or adaptations into different areas are too broad? For example confusion with conducted emissions? For EMC compliance, differential and common mode is readily explained such as this example from Wurth. For common mode noise to complete the circuit, parasitic capacitance forms part of that circuit when the switching device like a transistor. A transistor especially when placed on a grounded (to earth) heatsink can readily transfer common mode noise that exist in other parts of the circuit (or its own). Dependence on the circuit can also cause drama with noise propagation Differential mode Common mode A simpler drawing is from Murata in the pdf. Murata Differential and common mode noise.pdf
  10. Just a clarification here. In the 'past' some wall warts were a classic linear design, with transformer, rectifier caps and a regulation circuit that was typically a simple LM3xx. Due to the size and heat dissipation, the wall wart's capability was small to modest. If anything, the common mode noise 'could' leak through the heatsink and onto ground from the regulator, but that garbage was a mountain less than switch modes with their rotten X capacitor. After all, 80% of preamps use the same topology, sometimes with discrete devices but achieving the same purpose of flat DC.
  11. The DC types are so rare now and limited in power.
  12. Here's an extract from an Accuphase manual for a pre-amplifier. "Leave sufficient clearance when installing in a rack or similarly confined space. Never block the ventilation openings on the top and the bottom of the unit, and always make sure that air can freely circulate around the unit, to prevent the risk of damage. Special care must be taken when installing the unit in a rack. To ensure proper heat dissipation, leave sufficient clearance (at least 15 cm) between the unit and other components and surrounding walls, etc. Never install the unit in a rack that is closed on the rear and/or the front." That pre-amp is rated at 34W power consumption. Take that as ~ 80% efficient, the rest is heat.
  13. I like the style of the review enough not to buy the amp, appreciate the directness, thank you!
  14. Figure this out then. In the digital domain, how to decode Dolby A material cause the list of albums listed by John are digitally encoded with Dolby A.
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