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  1. K

    The importance of VTA, SRA and Azimuth - pics

    M. Fremer: "The result is that the stylus reads one side of the groove before the other. This problem gets exacerbated the further towards the center of the record the arm travels, resulting at the very least in gross phase distortion." Are we speaking about tracing error here? Klaus
  2. K

    The importance of VTA, SRA and Azimuth - pics

    I think this figure (which is from an old article in Audio Magazine) shows what J.R. meant: the cutter travels on a straight line (= dotted line = radius) towards the record centre, so the line connecting the two points of contact is coinciding with the radius. For other shapes this may no...
  3. K

    Master Reference List of Random "Acoustic Treatments"

    Living room of 8.5 x 4.6 m, acoustic ceiling (stretched synthetic fabric, 26 cm air space above, loosely filled with rock wool). CeilingAbsorption coefficients 0.72 (125Hz) 0.65 (250Hz) 0.71 (500 Hz) 0.75 (1 kHz) 0.84 (2 kHz) 0.94 (4kHz). https://www(dot)plameco(dot)co(dot)uk/
  4. K

    Is a very big listening room as bad as a very small one?

    It's approximately 3 dB. T. J. Schultz, “Improved Relationship between Sound Power Level and Sound Pressure Level in Domestic and Office Spaces,” Rep. 5290, American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) Klaus
  5. K

    Is a very big listening room as bad as a very small one?

    Well, I think that if you put the same drivers and Xover in a larger cabinet while keeping everything else constant (bass cabinet volume, location of drivers w.r.t each other) and place it such that the drivers are in the same location w.r.t. the room boundaries, then nothing changes. If you are...
  6. K

    Is a very big listening room as bad as a very small one?

    Schroeder examined the following statistical quantities of the frequency response curve of "large rooms": the rms response fluctuation, the average height of a maximum, the mean spacing of the zeros (i.e., the intersections of the response curve with the mean level), the mean spacing of the...
  7. K

    Is a very big listening room as bad as a very small one?

    The only room related parameter is reverberation time, the possible effects of early reflections and room modes depend entirely on the positions of loudspeakers and listener. In view of this there is no such thing as acoustics of a room. In a larger room early reflections may come from...
  8. K

    Griesinger's teachings show up in Klippel, Linkwitz, Toole, and Geddes

    Hello Duke, have been abroad for a while with no internet connection. Happy New Year to all. Your effect is based on a first ceiling reflection, with the other first reflections being weakened by narrow dispersion speakers, Blesser is talking about reverberation. Two different issues. If...
  9. K

    Griesinger's teachings show up in Klippel, Linkwitz, Toole, and Geddes

    Since the proof is in the pudding I put this issue to the test many many moons ago and posted the following on Audio Asylum: Dustcover open or closed, should your TT happen to have one, that is a question that regularly comes onto the table for discussion. I think that we all agree that a TT...
  10. K

    Griesinger's teachings show up in Klippel, Linkwitz, Toole, and Geddes

    The argument is that you don’t perceive the last/late part of reverberation anyway because it is masked by the music being played continuously. You only would hear reverberation fading into inaudibility when the sound/music is stopped suddenly. From Blesser 2001: “In continuous music, only the...
  11. K

    Griesinger's teachings show up in Klippel, Linkwitz, Toole, and Geddes

    Hello Duke, From Everest 2009, p.153: “Reverberation time (RT) is a measure of the rate of decay of sound. It is defined as the time in seconds required for sound intensity in a room to drop 60 dB from its original level. This reverberation time measurement is referred to as RT60. The 60-dB...
  12. K

    Griesinger's teachings show up in Klippel, Linkwitz, Toole, and Geddes

    Hello Duke, Some research has been done to investigate the effects of directivity, see my write-up. Kaplanis et al. indicate that his issue might be subject of further research. Only first order reflections are/may be of importance, higher order ones are too low in level to have an impact on...
  13. K

    Griesinger's teachings show up in Klippel, Linkwitz, Toole, and Geddes

    I think the following phrase in the section "Conclusions" very nicely sums up the paper: "The analyis indicated that rooms decribed by lower RT are preferred." So it's all about reverberation time, and it's all about preference. Preference is no subject to discussion, your preference is a...
  14. K

    Griesinger's teachings show up in Klippel, Linkwitz, Toole, and Geddes

    I’m not dismissing all listening as irrelevant in absolute terms, it obviously is relevant for the individual(s) in question. I consider listening results of others not relevant for me personally because of different pinnae, different listening conditions, different tastes etc. What sounds good...
  15. K

    Griesinger's teachings show up in Klippel, Linkwitz, Toole, and Geddes

    You don’t know the external conditions (room, audio components, set-up, music material, level etc.) under which other individuals have auditioned a particular component. Even when you know someone with identical pinnae these external conditions may be too different to rely on this someone’s...
  16. K

    Griesinger's teachings show up in Klippel, Linkwitz, Toole, and Geddes

    I did not specifically search for papers on this particular issue, but some of the ones I have in my archive might contain information relating to it. Angle of incidence indeed has an effect since the in-ear frequency response is different for different angles, see graph below. Further...
  17. K

    Griesinger's teachings show up in Klippel, Linkwitz, Toole, and Geddes

    No, I did take only a single reflection, so you are correct, the other one would add its share to overall SPL. I add Bech’s graph on detection thresholds of early reflections. I Think you will agree that in order to have an effect, positive or negative, a reflection has to be above threshold...
  18. K

    Griesinger's teachings show up in Klippel, Linkwitz, Toole, and Geddes

    Can of worms was maybe not the appropriate term. This issue would require some extensive digging in the scientific literature, but should you have an archive well filled in heat respect, give it a shot.
  19. K

    Griesinger's teachings show up in Klippel, Linkwitz, Toole, and Geddes

    Hello Duke, For 17 ms delay Griesinger’s reflection would have about 3 times the SPL, assuming that seat DD11 is 20 m from the stage. That’s another reason why concert hall stuff cannot be transcribed directly to domestic rooms. I noticed that I had made a mistake when crunching the numbers...
  20. K

    Griesinger's teachings show up in Klippel, Linkwitz, Toole, and Geddes

    Had a quick look and found this: www.davidgriesinger.com/ICA2013/What is Clarity4.pptx, go to slide 26, the right diagarm in slide 25 is basically fig 16 of Griesinger's AES paper. I also found this: “The measure is based on the idea that if we count the number of nerve firings (roughly...
  21. K

    Griesinger's teachings show up in Klippel, Linkwitz, Toole, and Geddes

    The way Duke describes the process, i.e. bounce from wall to ceiling to listening area, this "LCS" looks like a somewhat delayed ceiling reflection, which would still arrive well within the time window of the precedence effect for speech and music. In my own listening room this reflection would...
  22. K

    More than 15,000 scientists from 184 countries issue 'warning to humanity'

    The Dutch engineers consider that the current defences will withstand 1 m sea level rise, and to the best of my knowledge they invest 1B€ each year in those defences. The issue of going underwater is more in all those countries with no coastal defences at all, or without any consideration...
  23. K

    Griesinger's teachings show up in Klippel, Linkwitz, Toole, and Geddes

    Hello Duke, Fully agree with both statements, so we finally are in agreement: reflections have the potential to do bad things. That’s what I always said, and the literature supports that: reflections may do harm under certain conditions, but they don’t do harm under all conditions. Rather as...
  24. K

    Griesinger's teachings show up in Klippel, Linkwitz, Toole, and Geddes

    Hello Duke, When a room sounds bad, it is generally reverb time which is too high. Speech intelligibility is a good indicator. As Toole said/wrote, what we are listening too above the Schroeder-frequency is direct sound + interaction of the speakers’ off-axis response and room boundaries. If...
  25. K

    Griesinger's teachings show up in Klippel, Linkwitz, Toole, and Geddes

    Hello Duke, Indeed, the combination of different statements in the other thread led the reader to believe that first reflections are bad, because Griesinger’s clip demonstrated just that: “Done wrong in a home audio setting, the reverberant field degrades timbre and clarity...” “So what do we...
  26. K

    Griesinger's teachings show up in Klippel, Linkwitz, Toole, and Geddes

    Hi Duke, One further point you might want to consider: I understand that Griesinger “matlabs” the recording for a seat he did not like: “I’m gonna talk about this one (apparently the lowermost of the seats indicated on the slide), which is a seat I know from going to concert performance I do...
  27. K

    Griesinger's teachings show up in Klippel, Linkwitz, Toole, and Geddes

    Hello Duke, Low interaural cross-correlation means high dissimilarity of right and left signals, which is what listeners prefer. If you look at the data of my SPL-in-3-rooms you see that the across-the-room reflection is delayed by 7 ms (room 1), 13 ms (room 2), 68 ms (room 3). In rooms 1, 2...
  28. K

    Griesinger's teachings show up in Klippel, Linkwitz, Toole, and Geddes

    Hello Duke, There is a much more interesting passage you did not quote: "Image perception is dominated by the very earliest sound from the speaker, i.e. the direct sound (first arrival), and the sound that arrives in the first 5-10 milliseconds. The ear simply integrates this all into one...
  29. K

    The Reverberant Field: Why it matters, where the goal posts are

    Hallo Duke,
  30. K

    Griesinger's teachings show up in Klippel, Linkwitz, Toole, and Geddes

    Hi Duke, I started reading the thead and I join Blackmorec in not agreeing with your POV. One issue in passing: The delay of reflections depends on locations of source and listener. You move one (or both) and the delays change. Does the perceived room size change as well? What Kuhl stated...

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