One and a half

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  1. The results of proper re-clocking
  2. IfiGalvanic 3.0 delayed release More
  3. Mmm partially. Leakage currents from the power source are blocked, but they still feed through from the source eg computer or media server.
  4. This means SOTM couldn't control the jitter when using galvanic isolation and used the Regen technology instead. Nothing wrong with that, but the primary goal of stopping leakage currents from the computer to the DAC job is incomplete.
  5. Using the MC-3 here should work like this: Fit a sound card like an RME AES3 into the PC, important to have a WDCLK input. Output of the RME into a Mutec MC-8.1 Use the three out of four AES3 outputs to drive the Amplifiers. The MC-3 clock is connected to the RME, MC-8.1 clock inputs You will need to cable the AES3 outputs to single ended S/PDIF outputs on the amps. The source application on the PC should split the frequency allocation between the amplifiers. I'm not sure if Foobar can do this, haven't used it for some time. Speaker crossover is no trivial matter. Sending the wrong frequency to the speaker drivers can cause the voice coils to overload. Balancing each amplifier can be awkward, a poofteenth of a db either way can make a difference to the drivers in the speakers.
  6. So very true, good to excellent clocks are *not* cheap, not only for DDCs but for DACs as well. It seems the cheaper clocks don't do much at all for jitter, perhaps deliberately so to colour the sound output, giving the device its character 'signature' sound.
  7. This topic would be best served in a new thread, since the merit and detraction of each DAC can be quite a lengthy discussion. You've narrowed down some good choices, my 1.5 cents would go to #2.
  8. I found the Bose NC QC30 (?) microphones or gain control couldn't quite cope with resonances when used on the road in coaches. They would overload and cause a stutter. Sennheiser PXC450 didn't have that problem. For aircraft, the Bose were OK. The EQ in the Bose is impressionable in the beginning but I tired of the EQ and now settle on Sennheiser Over ear Momentum for road/air use. There's a fair of bit of passive isolation in the muffs that filter aircraft noise already, and find the NC technology not required. They don't fold into a neat flat(ter) pack, which is their downfall and cramming the case into the back seat aircraft pocket is a challenge.
  9. Yes, alt DSD is only for Playback Designs Dac's.
  10. Screened power cables are good, the Lo-RAD works as they claim, there's no field around the cable. As for sound, the Lo-RAD is bettered, perhaps another thread. Ethernet is a different story. This is best UTP, whatever category you like. The reason is the shield carries leakage currents form source to destination, UTP doesn't since there's no screen. Leakage currents are hopefully strangled by differential transmissions, transformers and the like in NIC.
  11. Add an Ethernet isolator between the pc and the audio device to prevent leakage currents between the two systems.
  12. Balanced power supply to work effectively is to use tight magnetically coupled windings to cancel the noise. An ISO transformer is wound for a different purpose so it won't achieve the cancellation properties in comparison. I suppose every bit helps, an RCD is required on the output though.
  13. The issue of using more than one iso transformer is that the impedance seen by the audio devices is different. With one transformer all devices see the same source impedance and more importantly the same voltage. With another, the voltage regulation is different, so theres a certainty that there's more shield current on the interconnects.
  14. I feel very uneasy about floating 230V for purposes other than testing and earth the secondary. This means adding an RCD on the output of the ISO transformer, so be it. All the shields in the Transformer are earthed to the incoming earth and output earth. It is also necessary to secure the output and input cable, so that it can support the weight of the Transformer and not rely on the connections only. The crimped earth connection is not that great, please use a crimp lug with round and secure with nut bolt washers and then insulate. Please use only the one transformer. If they were identical, you can parallel them, but requires some protection on both sides and is beyond the hobbyist level. Happy listening