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Nada last won the day on June 1 2013

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About Nada

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  1. Sensational project. What would you suggest for a complete budget to replicate your dedicated build, with all equipment and full install all done professionally?
  2. Im an IT idiot but I read there is no such thing as bit stripping: Digital volume attenuation does not change bit depth. If its a 24 bit PCM code and the volume is attenuated by 60 dB the PCM is still 24 bit encoded. No bits are stripped. The problem is the DAC SNR output will be compromised as the low signal sinks into the noise floor. If the DAC has a base 120dB SNR with a 0dB digital input and the digital stream is put through digital volume control at say -60dB the SNR (depending on the DAC architecture) will sink to only 60dB. Gain matching is vital using digital volume. This means its immaterial using 24 bit, 32bit or 64 bit digital volume control. The idea of 32bit being superior is just myth. Anything over 21bit exceeds any DAC technical limits with bits to spare. So 24bit is plenty.
  3. For your speakers to do DSP any analogue input will need go to an ADC.
  4. The DAC looks great. It looks like it has a very nice tube preamp in it. What is the preamp you used after the fixed output that sounded better? If the fixed output sounds better it may be about gain structure in the DAC. The volume pot probably cuts the signal going into the tube stage. That drops the SNR. The best passive pre in that case is a TVC. High gain is turned into lower impedance current drive. https://mfaudio.co.uk/preamplifiers/
  5. The Cal will be hard to beat. Have you tried cleaning the laser? Getting it serviced is a good plan. A replacement needs a similar Burr Brown DAC and good error correction which narrows choices down: https://www.stereophile.com/content/primare-cd32-cd-player-measurements
  6. https://store.realworld.co.uk/product/real-world/1-cd/caoimhin-o-raghallaigh-thomas-bartlett-cd/
  7. Talking about recharging options and thinking of CO2, is there any workable way to do significant recharging off solar panel derived power in Australia?
  8. Would it be worthwhile trying higher crossover points with gentle slopes too? It looks like an easy free experiment which might give interesting results with mid-bass rich music, like acoustic bass in jazz. Is there a current photo of your room and system to get an appreciation of what your doing?
  9. Thats an unusual issue. I have no idea but it seems like when warming up there's an issue. Maybe a poor connection with thermal expansion? Is it worth checking the solder joints or cleaning the tube socket contacts just to ensure its not something simple?
  10. The Kii-3 have a brilliant design in so many ways. One DAC and one amp per driver is so sensible. One query I have is how do you tune the sound signature beyond equaliser setting? So many audiophiles need vinyl or valves to enjoy their music. Are there DSP settings that can take the hard edge off some early CD's or tame that brittle sound some modern DACs and Class D do?
  11. Why dont you PM Jazzman directly about your math queries? He's super helpful and uses this forum. The usual Ripole design with the magnets sticking out will allow nice air cooling. With your plan to use shallow mount drivers and box them in will you need an air gap behind the magnet for convection cooling? Is there room? Construction wise there might be a case for using threaded rod and nuts to tie the side walls and drivers directly together.
  12. TotalDAC has a " -non-oversampling DAC compensation filter activated or disactivated by remote control " that when activated over compensates for NOS droop. Ive never heard a TotalDAC but if the compensation is turned on and the treble sounds hot it seems easy to turn it off. I prefer NOS DACs to be fed sample rates over 88.2 which is easily done using computer as source. That will fix the NOS droop and can sound better regardless of NOS droop. Or not ...
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