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  1. Duke

    Possible disappointment with new setup?

    Those are both symptoms of the first reflections arriving too early and being too strong. You might look into speakers with narrower radiation patterns, and position them to minimize the strength and maximize the delay of the first reflections.
  2. Duke

    Bought genelec 7370, now sad.

    If the sub is in a very similar location to a speaker, it is going to interact with the room in a very similar way, resulting in a dip in a very similar place. You might try placing the sub in a very different location from your main speakers.
  3. Duke

    Are MBL omnidirectional speakers worth the $$$?

    Ime it relates to both, but the arrival time (of the reflections) aspect is often overlooked and underappreciated. Too much too early degrades imaging, but the same amount of reflection energy arriving after a longer time delay doesn't spoil the imaging precision. If early arrival of the...
  4. Duke

    "Breaking Speakers' Hoffman iron law"¹: Dual Force Cancellation Subwoofers Vs Magnetic Negative Springs.

    In the November issue of Voice Coil Magazine, James Croft favorably reviews the patents for Brane's Magnetic Negative Spring technology. Apparently the first patent based on the negative spring concept was issued about seventy years ago, but Brane's approach seems to be the first practical one.
  5. Duke

    Are MBL omnidirectional speakers worth the $$$?

    I've seen the abbreviation "DBA" used to mean "double bass array" and "distributed bass array". Which do you mean?
  6. Duke

    Are "non-conventional" speaker designs worthwhile, or just gimmicks?

    I think they were dipoles, with air gaps between the rows of magnets. But they were "single-ended" (magnets on one side of the woofer diaphragm only; not sure about the high frequency diaphragm). So as the diaphragm moved away from the magnets, the force on the diaphragm was reduced. And as...
  7. Duke

    Are "non-conventional" speaker designs worthwhile, or just gimmicks?

    One of the things that earns high regard here on ASR is good measured performance on a Klippel NFS system. But consider this: Many of the better multi-directional systems are too large for this to be practical, not to mention that their multi-directional nature is itself a deterring...
  8. Duke

    Introduction of Vera Audio Coherence 12 - a high quality speaker many can afford

    Excellent job of taking early room interaction into account. Your design choice makes sense to me.
  9. Duke

    Most beautiful speakers in the world ?

    When I was a kid I designed and built boats. When I became an adult I designed and built speakers. I think that designer is me on another timeline.
  10. Duke

    Cross firing speakers

    Briefly, the first contralateral reflections lack the image-broadening effects of the first ipsilateral reflections. They are arguably more benign as far as coloration goes and have less of a tendency to blur the image locations. See page five of this paper by Earl Geddes...
  11. Duke

    Cross firing speakers

    Yes! If the speaker is pretty close to the front wall, there will be a reduction in the magnitudes of the first dip and first peak from the front wall bounce. I hadn't thought of that. Good call!
  12. Duke

    Most beautiful speakers in the world ?

    I love their equipment stands!
  13. Duke

    Frontal reflections, depth of soundstage, and dipoles

    I would expect the ear to localize the sound source at wherever location it first arrived from (assuming an arrival time difference of at least .68 milliseconds and no significant intensity difference favoring the later-arriving signal) due to the Precedence Effect (or Haas Effect or Law of the...
  14. Duke

    Frontal reflections, depth of soundstage, and dipoles

    Agreed, there are no useful directional cues in the in-room reflections of the reflections on the recording, but there are spatial cues - ambience, hall reverberance, distance cues - in those reflections of reflections. Thanks for clarifying your position. I don't think we're going to agree...
  15. Duke

    Frontal reflections, depth of soundstage, and dipoles

    Ime the front wall distance matters a LOT with dipole speakers, which direct just as much energy towards the front wall as towards the listening area. I would have kept the same listening triangle geometry but I do not have an actual recollection of moving my chair. The listening triangle that...
  16. Duke

    Frontal reflections, depth of soundstage, and dipoles

    This makes sense to me (surprise, surprise!). By not absorbing the first reflections, but either reflecting them (presumably not directly towards the listening area) or diffusing them, that energy not only survives to become late-arriving reflections, but it also retains its original spectral...
  17. Duke

    Frontal reflections, depth of soundstage, and dipoles

    The reverberation tails in the recording will last a lot longer (and therefore continue to deliver cues to the listener for a lot longer) than either the direct sound OR the playback-room reflections of the direct sound, because they are being injected into the reflection field via the in-room...
  18. Duke

    Frontal reflections, depth of soundstage, and dipoles

    Excellent question! The listening room cannot make a distinction between the reflections on the recording and its own native reflections, but our ear/brain systems can! The ear/brain system can tell which first-arrival sound a given reflection goes with by looking for overtone sequences that...
  19. Duke

    Frontal reflections, depth of soundstage, and dipoles

    My experience has been that the spatial impression of being inside the music venue (whether the venue spatial cues be real or creations of the recording engineers or both) is not present when the direct-to-reflected sound ratio is too high. My hypothesis is that spectrally-correct, relatively...
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