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  1. Chris A

    Time alignment vs phase alignment for subwoofer and main

    In my experience, yes, it will, if you're crossing at 80 Hz or higher (i.e., almost half wavelength added delay of the loudspeakers relative to the subwoofer using an added 4 ms). Thus far, you haven't mentioned the crossover frequency you're using and whether or not you've got higher-frequency...
  2. Chris A

    Bad music you love

    Some of the musical ideas there are interesting, but just as it's probably difficult to listen to (very) old Junior High band recordings (age 13-14) with the full range of beginner playing issues implied in that "active listening activity", I don't find myself doing that very often...perhaps...
  3. Chris A

    Bad music you love

    Bad music that we might listen to can include more types of poor choices than the examples presented above. In particular, bad composition is something that few ever talk about...but we can certainly hear it. An example album having consistently poor compositional performance--that you can...
  4. Chris A

    Are tubes more musical?

    See Tubes and Digital Audio. It turns out the the human hearing system is (apparently) sensitive to room-loudspeaker effects or headphone-eardrum bounce effects--even down to -50 to -60 db from the signal level. So what you're mostly hearing is variable reverberation effects dependent on the...
  5. Chris A

    What are the acoustic consequences of having a tall rack of equipment between two speakers?

    I've used a couple of other methods, including moving the microphone around then looking at RT30 values in-room (which surprisingly moves the RT30 curves around a lot dependent on mike location). I've done this approach to add just enough panels to the sides of the center loudspeaker (nowadays...
  6. Chris A

    What are the acoustic consequences of having a tall rack of equipment between two speakers?

    I should also point out that in the floor bounce case, above, there were areas of acoustic reflections that were at lower frequencies that roughly corresponded to the higher frequency bounce areas, but the resolution of the lower frequency bounces don't permit you to see them nearly as well...
  7. Chris A

    What are the acoustic consequences of having a tall rack of equipment between two speakers?

    <tutorial> First, the goal (stated clearly): finding early reflections in the (REW) measurements, and correlating how strong they are and where they are in-room. Next, the most-used plot to find early reflections: in REW, the energy-time curve (ETC), which is found under the "Filtered IR"...
  8. Chris A

    What are the acoustic consequences of having a tall rack of equipment between two speakers?

    There is no "generic" advice on this particular subject, only specific instances that need to be considered. What I was going to show is that you can estimate whether or not you're going to have issues based on loudspeaker directivity (yours), and placement relative to the walls. All of these...
  9. Chris A

    What are the acoustic consequences of having a tall rack of equipment between two speakers?

    Personally, I don't believe that I'd call those "controlled directivity" unless talking above 1 kHz. Most of the midrange is below that frequency. Vertical is typical for this sort of loudspeaker (no directivity plot but a polar sonogram instead): Could you describe the placement of them...
  10. Chris A

    What are the acoustic consequences of having a tall rack of equipment between two speakers?

    Yes, there is. But it depends on the directivity vs. frequency of your front stereo loudspeakers and their placement relative to the front and side walls. For instance: Corner Horn Imaging FAQ. For loudspeakers having full range directivity (like corner horns and polar dipoles) the effect of...
  11. Chris A

    Prices of Very Large Flat TVs are Falling Fast

    Sorry for resurrecting this now-old thread, but I recently happened upon a bit of information that I wanted to share that's apropos to the subject at hand. I had made a much earlier comment (reproduced above for ease of reference only) about the dynamic range of OLEDs over competing...
  12. Chris A

    Subwoofer suggestions strictly for challenging pipe organ music.

    For others that haven't already made up their minds on this subject... :rolleyes: Here is a spectral plot from a Virgil Fox CD, the final fugue from Toccata, Adagio and Fugue in C major, BWV 564, showing the 32' fundamental at 16 Hz, highlighted in red: This is pretty typical of full pipe...
  13. Chris A

    Subwoofer suggestions strictly for challenging pipe organ music.

    The organ recordings that I own that have only 16' stops were recorded mostly in the 1960s/1970s--mostly on LPs (and some were later transcribed to CD). These make up an older segment of the extant pipe organ recordings--and ones of which I now generally do not listen to, with notably few...
  14. Chris A

    Subwoofer suggestions strictly for challenging pipe organ music.

    Because of the nature of pipe organ music that leads to sustained high output pedal notes (32', and even some 64' foot stops,) [divide 1132 ft/sec speed of sound at room temperature by 2x the length of the longest pipe in the rank mentioned], you are really at the mercy of the recording...
  15. Chris A

    Where does my soundstage go?

    (I just stumbled onto this subforum. The breadth of my reading here is limited.) I've done many REW measurements over the years in-room (12 x 4.7 x 2.7 metres--152 cubic metres total volume, RT30 is generally ~0.4s from 100 Hz to 6 kHz). The room's Schroeder frequency is ~100 Hz. In other...
  16. Chris A

    What does “musical” mean? Audiogon takes a stab

    Here's a "musicality" effect that is measurable and documented: you can refer to this thread, which describes an effect that I believe few have actually experienced first hand. And just keep in mind...there are three in-room acoustic conditions that must be simultaneously met for this effect to...
  17. Chris A

    Sometimes a passive crossover is just stupid...

    You might consider that Mr. Berchin may be implying that this doesn't have to be Bluetooth...which we all have probably heard has problems in congested living areas. And using low power DC to resupply batteries at each loudspeaker (like a laptop recharges its battery only periodically) is a...
  18. Chris A

    Sometimes a passive crossover is just stupid...

    The only time that I would consider using passive components between the amplifier output terminals and the individual driver(s) is for those applications where current drive (transconductance) amplifiers cannot be found at a reasonable price, and the user wants to experiment with current drive...
  19. Chris A

    Sometimes a passive crossover is just stupid...

    I don't use passive crossovers in my 5.1 setup or on other temporary setups that I've used. I've found that the fast limiters in the DSP crossovers do a much better job at protecting small tweeters with very limited power handling. And I don't use amplifiers that have a tendency to fail...
  20. Chris A

    the most beautiful and famous pop songs of the 40 years

    Eva Cassidy - Fields of Gold (1997) Beautiful. I like this cover more than the original version. Same thing for the next track (which I can't make up my mind which one I like more): Eva Cassidy - Autumn Leaves (1997) Chris
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