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About bobovox

  • Rank
    Ring Radiator
  • Birthday 11/06/1972

Personal Info

  • Location
    SE London
  • Real Name
    Robert. Not Bob.

Wigwam Info

  • Digital Source 1
    Arcam CD Player
  • Digital Source 2
    Various Pi-based
  • DAC
    Pioneer N50
  • Integrated Amp
    Arcam, Cyrus
  • My Speakers
    B&W, DIY
  • Trade Status
    I am not in the Hi-Fi trade

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  1. Thanks, Pete that explains it.
  2. Dan, I don't see your sig either:
  3. If the sample include a high proportion of people who rarely, if ever, go to listen to live music and are used to listening to low bit-rate music on small portable speakers, then that result is not unexpected, but I would expect that most audiophile listens will readily notice the poor quality at 64kbps. 128kbps is perfectly listenable on earbuds & the car but I'm pretty sure I could spot even unsighted on any half-decent hifi system.
  4. 64kbps MP3 sounds ropy even on the car stereo.
  5. I’ve certainly never been able to hear any difference between speaker cables. The point of the exercise was to test if it is conceivable that there could be an audible difference that I had not previously detected. What’s your point with the second part?
  6. I did recently do an impedance sweep on a 5m length of speaker cable to see how this varied with frequency. From the results of these measurements, I calculated an equivalent resistance and inductance - as I understand it, in a speaker cable the effect of inductance will dwarf that of capacitance in the reactance term, within the audio band, so I assumed zero capacitance. I put the calculated series resistance and inductance into some crossover simulation software to see if the reactance of the cable would likely have any audible effect. In this case, the effect on frequency response was negligible and almost certainly inaudible. I used a Dayton DATs v3 for the measurements - I don't have anything more sophisticated available. I could try making a similar measurement with the cable suspended between a series of little towers (books or whatever comes to hand) if you're really curious, but given the conclusions above I don't think there's much point. It'll have to wait until the weekend as still working full time through lockdown (fortunately).
  7. He's the kind of guy that will always try to externalise blame. He clearly won't resign of his own volition, he will only be forced out if and when the damage done to the government's standing become so severe sufficient numbers of Tory MPs find the situation intolerable.
  8. I've always assumed an amplifier output impedance of 0.1ohms for a solid state amplifier in DIY speaker calcs, plus 0.1ohms for the speaker cables (measured). With those values in the cable, the corner frequency is well out of the audible range. Edit: Ooops, these are interconnects! I was thinking these were speaker cables.
  9. Classical is a big proportion of my listening; a lot of recordings are mixed in a way that could never sound truly convincing, like you were at the performance. For example the balance between the orchestra and soloist is often nothing like you would hear in the concert hall, even in the good seats. The BBC live broadcasts tend to be more natural sounding in this respect than most commercial recordings. There is also ambient information about the room / hall it was recorded in, which is obviously very different to the acoustics of my living room. Stereo has it's limits - multichannel and binaural are more immersive. So, I just don't trouble myself trying to recreate the actual gig, I just enjoy the "window" onto the performance that the recording gives.
  10. Many times. Given that CD players essentially blameless in terms of the limits of human hearing I just can't see how one CD player can convey emotion in a performance better than another. I really don't think that makes me less of a music lover, it just makes me skeptical about the values ascribed to certain bits of equipment. Speakers, perhaps yes but not CD players.
  11. Presto have at least 35 different recordings of Shostakovitch's 8th Symphony, I gave up counting after that. I'm sure I would recognise great differences in the emotion conveyed by each. I've never thought of any one CD player being more "emotionally expressive" than another.
  12. I think the reason that blind testing is mentioned frequently on this site, particularly in threads where some of the more extraordinary claims are made is exactly for the reason you mention here; that unsighted, the “night and day” differences once eulogised over all of a sudden become difficult to discern -a source of stress even. I certainly would not buy anything unsighted, not least because my subjective appreciation of the aesthetics of something that will sit in my home for years to come is a major part of the purchasing decision.
  13. Toole’s book is well worth reading by anybody with an interest in sound reproduction and requires no prior knowledge of electrical or acoustic theory. As per the subtitle, it is very much about psychoacoustics and is written in a way that makes the content accessible to the interested lay person.
  14. Yes it does, section 3.3, entitled "Stress and Strain" addresses the twin criticisms of unsighted testing: 1. Extraordinary stress is placed on the listener - removing the visual stimuli actually makes the task in hand, grading the sound quality of the speakers, simpler. "After a brief introductory period, they [the listers] simply settle into the task". 2. Sound samples being too short: "... there is no time limit - switch at will, and take as long as needed". The musical excerpts are short, but repeated in nicely segued loops to allow for detailed examination. Stressful?" How stressful is it to sit in a room and listen to three or four speakers behind a screen and grade each? It's the speakers that are being tested... Posted with apologies for taking the thread even further OT.