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  2. My guess is that it is engineered and tuned to optimize dialog in movies. https://en.wikipedia.org/wiki/Voice_frequency The voiced speech of a typical adult male will have a fundamental frequency from 85 to 180 Hz, and that of a typical adult female from 165 to 255 Hz. Thus, the fundamental frequency of most speech falls below the bottom of the "voice frequency" band as defined above. Bill
  3. Today
  4. garyrc

    Teacher Question about Netiquette

    That's child abuse. I believe in light, thoughtful, empirically supported testing as part of the educational experience, not as an intrusive element that displaces too much teaching and learning. I fully realize that the suggestions below are a bit radical, at least in some eyes. I think when a child is ready, that child should be tested, not during a hell week. Some will be ready early, some late. Tests should be finely diagnostic, suggesting what areas need work, and congratulating the child for areas they have mastered. The tests should not be noxious, but lightweight, fun, and short, short enough to be given when a child is ready to be tested on that unit, during a time they can book for testing, with a rotating proctor who is there many hours per week (perhaps teachers doing paperwork?). Instead of a 4 to 5 hour testing session, there would be short tests throughout the term when a student feels ready to be tested on that unit. Making the testing pleasant may be the most difficult part for the test's creators, and the teachers. So, as a student, I might get two weeks of instruction in quadratic equations, go through some supportive homework, and feel ready, so I would book myself into the "proctorium" to take the test. Up to about thirty students could be tested at once, as long as quiet is maintained, with students arriving when ready and leaving as they finish their tests. No test would be timed, or "speeded," as testing people say. These lightweight, but reliable and valid tests would have to be a complete and sufficient substitute for the current state-wide testing. There should be retesting to mastery (acknowledging that not every child will be able to achieve mastery in the system as it is). At the very least, the test-retest scores should not be averaged or otherwise combined, but only the last one on a given unit, for each student, should count on the grounds that it is what you can do at the end of the process that counts, and that presents the best snapshot of the learning that has occurred. Statistically equivalent forms of each test are remarkably easy to create. We had a testing procedure like this at SFSU, for statistics students. It worked very well for most, but not all. Different strokes. Thanks to retesting to mastery, the grades tended to be mostly A's and some Incompletes. Those getting A's were performing at the A level. The administration objected to so many A's being given, so the professor said, "Send any administrator down -- Hell, send them all down here and let them take our tests, and see if they get handed A's for their performance without getting our instruction. There is learning going on at the A level here!" Nobody took him up on it. What should be done with the final scores is controversial. There are many colorful and borderline obscene suggestions. One option, in part, is to look at change scores for each child, and consider improvement to be the goal, not some desired (and arbitrary?) level of performance. A more radical proposal would be, in addition to all of the above, to keep all test scores between the teachers and the students, and deny them to the administration, the district, and the state. Don't get fired. I like the quote in your signature: "The theory of quantum electrodynamics describes Nature as absurd from the point of view of common sense. And it agrees fully with experiment. So I hope you can accept Nature as she is--absurd." -- Richard P. Feynman. Hawking would agree, reinforcing the idea that experiments support quantum mechanics, even though "the math is dubious." He also points out that the "M" in M-theory may stand for "master," "mystery," or "miracle" and that it seems to be all three.
  5. Re-posting this from "Home Theater" forum. Why is the frequency response of the RP-150M better than the RP-450C ? Based on the cabinet size and number of woofers, it seems that the RP-450C should have the better/lower frequency response but it does not. Why ? RP-150M: Frequency Response: 48-25kHz +/- 3dB Dimensions: 14.57” (37.0 cm) x 7.67” (19.5 cm) x 10.67” (27.1 cm) Volume: 1192 cubic-inch Power: 75W/300W Woofers: 1 x 5.25" Enclosure Type: Bass Reflex RP-450C: Frequency Response: 58-25kHz +/- 3dB Dimensions: 6.81 “ (17.3 cm)x 31.13” (79.1 cm) x 14.51” (36.8 cm) Volume: 3076 cubic-inch Power: 150W/600W Woofers: 4 x 5.25" Enclosure Type: Bass Reflex Kris
  6. Why is the frequency response of the RP-150M better than the RP-450C ? Based on the cabinet size and number of woofers, it seems that the RP-450C should have the better/lower frequency response but it does not. Why ? RP-150M: Frequency Response: 48-25kHz +/- 3dB Dimensions: 14.57” (37.0 cm) x 7.67” (19.5 cm) x 10.67” (27.1 cm) Volume: 1192 cubic-inch Power: 75W/300W Woofers: 1 x 5.25" Enclosure Type: Bass Reflex RP-450C: Frequency Response: 58-25kHz +/- 3dB Dimensions: 6.81 “ (17.3 cm)x 31.13” (79.1 cm) x 14.51” (36.8 cm) Volume: 3076 cubic-inch Power: 150W/600W Woofers: 4 x 5.25" Enclosure Type: Bass Reflex Kris
  7. PM Sent. Regards, John
  8. windashine

    Social Media Literacy

    1. Historical Perspective of media - (in my own words) … phase 1 - for cave dwellings, cave painting, art, existence, make better tool's, round wheel's, more people, disagreements between people, use the wind to power sail's, bow's and arrow's, rule's and law's, morse code translators, newspapers, inventions, electricity, television, speakers, an era of relief and excitement, nice black model T's, big tanks and bomb's, civilized record players, bigger concerts, avocado colored refrigerators, dos, punch card's, windows 3.1, icq, dial up modem's, exit phase 1, over and out....
  9. K5SS

    What I Got Today!

    It comes with a remote, that you use to control the colors and other settings. I actually prefer leaving the white LED on when watching TV, heck, I now leave them on 27/7 m. It makes everything look “crisper” for some reason. Here is what I ordered: https://www.amazon.com/gp/aw/d/B0788Z13K2?psc=1&ref=yo_pop_mb_pd_title Sent from my iPhone using Tapatalk
  10. wvu80

    What I Got Today!

    I've seen others use that kind of backlighting. How do you control the colors? Is there a practical use for the lights, ie makes the TV look better, easier on the eyes, etc, or is the lighting purely for effect?
  11. mangofirst

    Cables, Coffee, and Cocktails

    No wonder she won an Oscar for this! That was quite a monologue.
  12. Yep, like a K43, as I discovered. But for those who want some really great drivers. AE are tops. Expensive but worth it.
  13. K5SS

    What I Got Today!

    Thanks to a fellow forum member’s recommendation, I picked up some LED lighting to go behind my TV. Very good use of $40! Sent from my iPhone using Tapatalk
  14. mangofirst

    Teacher Question about Netiquette

    I do not fall under the labels of conservative or liberal thank you very much. GDI till I die!
  15. mangofirst

    Social Media Literacy

    Middle school would be a great time to start social media literacy, however I started my teaching career at the high school level, so discussion of any and all levels is great.
  16. wvu80

    Teacher Question about Netiquette

    Aren't you a little too conservative to be a teacher? I'm beginning to have doubts about you...
  17. mangofirst

    Teacher Question about Netiquette

    Oh yes, we are test proctors. There's a whole bunch of stuff we are told not to do, but the first and the most heartbreaking is not to help them with anything besides technical issues. Just imagine teaching a group of kids every year, modifying your lessons based on different learners' styles and ability levels, then watching them struggle for 4-5 hours a day for a week straight. It's all so logical. 🙄
  18. twk123

    New Khorns???

    Do you know if there will be any certified dealers in Colorado? Im surprised none popped up even in the Denver metro area and I would love to listen to these in a showroom.
  19. mangofirst

    Teacher Question about Netiquette

    1) I was not, but you can damn well bet that I will have one within the week if such a thing exists. 2) I get your reference, old man. 3) My heart just dropped into my stomach reading that. Hmm...the game is afoot!
  20. Did the 4.9 mH inductor originally have a steel hold down screw in the middle? 😉 Try running your low-pass calcs using 20 ohms instead of 16. The bass horn raises the woofer's impedance a lot. Al Klappenberger showed a Belle Klipsch' bass horn doubled the DCR of a K-33-E within its operating range.
  21. 314carpenter

    New Khorns???

    Just in...Sound&Vision just did a write up on the new AK6 Klipschorn. https://www.soundandvision.com/content/klipsch-updates-klipschorn-—-speaker-started-it-all
  22. windashine

    Social Media Literacy

    8th grade level or ….
  23. mangofirst

    Teacher Question about Netiquette

    Now, now, let's not start talking about how boys and girls are different and have different brains and body parts and stuff or you might offend a little snowflake.
  24. mangofirst

    Social Media Literacy

    Already thinking about adding an 'Economics/Marketing' type section to include analytics and affiliate type stuffs.
  25. I'm about a half hour west of Milwaukee, WI
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