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  1. R

    Topping B100 Amplifier Review

    I miss an option in the rating: [x] confused. For an analog amplifier design the heat sink and air ventilation is much too small. I would expect it to overheat within minutes when you drive this amp at 1/3 of rated power.
  2. R

    SMSL RAW-MDA 1 DAC & Headphone Amp Review

    I think the pll here is based on a single crystal based osciallor, which means the working frequency of this pll can adjusted in a verry narrow range only. But this may not be a problem if all audio signals are updsampled in the ESS DAC chipset anyway.
  3. R

    SMSL RAW-MDA 1 DAC & Headphone Amp Review

    Just a concern: from the product pictures i can see, that the clock processing circuit seems to use only 1 quartz crystal based osciallor instead of two for n x 44.1 KHz and n x 48 Khz. I'm not sure if this is something new. I hope that they not save expensives with dropping top cd performance...
  4. R

    Rotel RB-1070 Amplifier Review

    Warning: this device doesn't have a relais to disconnect your expensive speakers in the case of an DC-error or a short-circuit in the output-stage! It has an over-temperature protection. In the case of over-current from an output, fuses will blown. But thats a risk for getting DC on an output...
  5. R

    Which DAC measurements do you like to see next?

    i would like to see channel separation over frequency and out-of-audiorange noise measurements. That would be a great addition to the very helpful reports here.
  6. R

    Is Digital Audio Transmission Analog? [video]

    Sorry, amirm, but you missed the critical point here: in the SPDIF/AES Standard biphase-mark encoding is used and the clock is derived from the zero crossings. But the zero crossing time depends on how long the high/low periode was before. This means that if the signal bandwith is insufficient...
  7. R

    SMSL SH-8S Review (headphone amplifier)

    Just a general remark: a dac only needs a few chips today. so i don't want to buy a separate headphone-amp and a pre-amplifier with the same limitations of the cheap volume-potentiometer. this should all be part of a dac and volume control can be handled easily in the digital domain with a few...
  8. R

    Hidizs S9 Review (Headphone Adapter)

    Is there an mobile app to change settings like samplingrate and pegel? And is it free?
  9. R

    HIDIZS S8 USB-C Headphone Adapter Review

    I'm a bit confused about the measurements: SINAD without load is 114dB - impressive! But THD+noise dropped to -88dB with 33 Ohm load. So maybe a separate ampilifier would help. But even with 300 Ohm we have THD+noise -100dB. Thats a little disappointing. But anyway, in the real life the...
  10. R

    Topping D90: What is Purpose of Digital Filters?

    Jitter is just noise in the time domain, leading to unwanted side-frequencies especially at high signal frequencies. You need at least several hundred ps of jitter to have an impact on a 16 bit music signal... on a 24 bit signal the quality would be degraded earlier, but that is probably nothing...
  11. R

    Easiest way to isolate the DAC from the noisy PC?

    An CM6631A or XMOS asynchron USB-Audio-Interface (with separate Power Supply at best) and an optical Toslink Cable to a separate DAC. I think this is a easy but good enough way.
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