boom3
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Posts posted by boom3
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5 hours ago, Bubo said:
What does the scanner work out to in terms of MB
Is it fair to think of the glass as the aperture, quite large, with a single focal length?
What have you experienced as the depth of field, 1 or 2 inches ?
1. Scanned in 2003 using my old HP 5300 which was limited to 1200 dpi optical. I don't recall what dpi I scanned this at, but the original TIF file is 4980 x 4790 and is about 72 megs.
2. Yes
3. About 1 inch.
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much prettier than the usual copier pictures we saw in the 80s!
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I've done some direct scans of 3D items, like coins and "flat" flowers, also used it as a surrogate microscope; scan at highest res and them use Zoom feature in my photo app de jure. By this method, I was able to show an engineer some galling on a fastener. He suspected it but we had no microscopes over 10X around.
Here's a Bird of Paradise with some black cloth behind it (lid of scanner up)
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I got both doses of Moderna. First produced no reaction at all. Second gave me flu-like symptoms for two days
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Always liked their ads, although I never heard the legendary and well-reviewed Model III, designed by James Bongiorno, also famed for GAS and Sumo designs (I use his Electra II preamp). He was generous with his time and while alive, would answer questions on the Yahoo Sumo/GAS forum.
I don't recall his opinions on Klipsch products. The little alien in the center of the ad is my fave. Recognizable in this mage are the Ohm Model A, the Great Heil and the original Quad ESL.
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Thanks, found a stream from California that is all theatre organ music. Soothing in the evening
Also, for some reason, found fire dispatch from Jefferson parish, LA
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On 2/9/2021 at 12:14 PM, ClaudeJ1 said:
I measured the Cornwall midrange down to an actual 500 Hz. from 1 meter with the woofer and tweeter disconnected. Mine are from the late 70's, but I'm guessing since they came with no tags, but are clearly Klipsh factory Birch, which were called KCBR at the time, methinks. As to the "strain on the midrange" I disagree. The K55/Atals driver is designed to go down to about 100 Hz. in a bullhorn application.
Yep, the midrange does not cleanly cut off at 600 Hz-no DSP here.
Yeah, the PV-5D will go down to 100 Hz in a "bullhorn", but bullhorns accept levels of distortion that we can't accept in hi-fi. A bullhorn or any other voice PA is designed for intelligibility, not fidelity.
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The larger baffle makes the transition from woofer to midrange much smoother than with a Heresy. The baffle of the Corn is 24 inches, larger than the wavelength of the 600 Hz crossover point, so it supports loading very well.
An interesting comparison is with the Klipschorn, whose width is just little wider than the wavelength of the first crossover of 450 Hz . The original crossover point of 400 Hz had a wavelength just little larger than the system's width. That difference is probably insignificant, and I suspect the crossover point was raised to reduce strain on the midrange.
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"A Hero on Mount St. Helens" Melanie Holmes; University of Illinois Press, 2019.
The author relates two intertwined subjects: Mt. St Helens and why it blew up (again) and the life and work of David A. Johnston. He was the young vulcanologist whose famous last words "Vancouver! Vancouver! This is it!" have become one of those memorable quotes of science. She explains these complex subjects very well, and also relates the bureaucratic issues and media circus that surrounded the watch over the mountain. Johnston saved lives by running off the curiosity seekers and media who wanted to stand next to him in case "something happened."
Since this is the Klipsch forum, I'd also add that Alan Hovhaness's "Mount St Helens" symphony is a fantastic piece of music and great way to show off your system.
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You need to talk to a boat dealer or mechanic. Boats often run multiple battery set-ups and have a combination of "1, 2 1+2" switches to manage them. The boat guys understand this concept.
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sounds like a distorted recording of a kazoo
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Florida yard dawg
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Just because someone has a YouTube channel with many K subscribers doesn't make them better informed. A.R. has some good industry background but most of what he says is no better informed than anyone who is an average audiophile (whatever that may be). He is Klipsch-friendly. Right now the reviewer I like is https://www.audiosciencereview.com/forum/index.php?reviews/
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Thanks for this Chris. I'd love to buy a copy of the book but the price of USD150 is a little steep for me
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On 1/4/2021 at 9:42 PM, BigStewMan said:
I've never been to any of his shows; but my brother has and sound it was LOUD. One of the opening acts was a band called Faster Pussycat and he said they were painfully loud. I knew that my hearing loss was serious when I went to a Roger Waters concert at the Hollywood Bowl. After the show, I was talking to a person that I went with and I said that I was surprised that the sound wasn't louder. He said, "it WAS loud."
If you can find Alice's appearance on the Muppets Show, you'll like it. In his prime. Saw him on the Billion Dollar Babies Tour of '72 (?) Great show.
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Glad Maynard chimed in. As a SWL myself, I can share two things before you spend big bucks and are potentially disappointed:
First, in current households the level of radio frequency interference (RFI, or if you prefer QRM) on shortwave bands is incredible. Computers, smart devices, Bluetooth, air cleaners, all those things we didn't have when I started SWLing as a kid in 60s. I compared my very techie household with my late mother's (she had no computers or smart devices). The RFI was less but I still got quite a bit from her younger neighbors. I made a "magnetic loop" antenna to sit on my desk when listening, and that helps to a degree. PM me for details.
Secondly, the glory days of international broadcasting are over, thanks to the internet. The cost of a SW broadcast plant, antenna, power, engineers and land is so much greater than just streaming on the Web. Some broadcasters have realized that their antenna land is more valuable than the ability to broadcast and they have gone to the Web and now just stream their content. They sold the land to developers and cashed out. So, many former SW outlets are gone.
Those that remain are not nearly as interesting as in Cold War I. Even the communist/socialist stations have toned down their rhetoric- no more "imperialistic running dog" diatribes from Radio Havana or Radio Peking (Beijing)
Having said that, I still enjoy the thrill of the hunt...
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To be clear, I was speaking of entire speaker systems, not individual parts.
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No "holes" but a documented dip, which as I said before is an artifact of woofer to floor relationship and present in most large loudspeakers. Unless it is consistently audible with variety of music, I would disregard it.
The report attached above says:
"Frequency response is smooth from 25 Hz up to 20 kHz. A "deep" at 350 Hz is due to floor reflection (microphone was 1 m from front panel..."
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This nominal value means that owners should not worry too much about the speaker drawing too much current from the amp. Some years back, people often paralleled two speakers on each amp output. Two 8 ohm speakers in parallel shows the amp a 4 ohm load, which most modern amps are OK with. Two 4 ohms paralleled on one output shows the amp a mere 2 ohms, which will make amps overheat and possibly blow output transistors.
That was then, and now 5.1 channel amps are common, so I have not heard of anyone paralleling speakers on an amp recently. Still possible with vintage amps and receivers that have "Speaker A/B/A+ B" selectors.
No amp is "set" for any impedance, the manufacturer is just suggesting that speakers around 8 ohms will present an acceptable load. In practice, solid state amps are happy with speakers whose "nominal impedance" is between 4-16 ohms.
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Here's a test report done in 1999 on Corn IIs (like the ones I have). The "dip" you are referring to is due to floor bounce. It shows up in measurements but room acoustics and our own ears average it out. Corn IIIs and IVs moved the woofer up the panel, so, having a longer path to the floor, that bounce will be moved down in frequency. That is, providing that Roy did not fix it by crossover design.
Narrow dips measured in speaker response normally are inaudible, since, as I said, the room acoustics average things out,. and our own ears tend to "fill in" these dips. A peak is much harder to ignore.
I would not alter the crossover without having measuring gear to see first, what problems you are trying to solve and secondly, if you solved them or not. The response problem I had with my Corns was that they tend to boom in corners. Pulling them 18 inches out from the corners fixed that.
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On 12/16/2020 at 10:11 PM, Islander said:
It's a different world over there. This footage is from some of the roads on a university campus, if I understand correctly. You'd swear they're driving with their eyes closed.
https://www.youtube.com/watch?v=OcsZxUDWCXg&t=34s
I wonder what auto insurance is like in China, and do they assess points on licenses? Looks like a lot of these incidents are at the same intersection
How content are you with your current stereo/surround setup?
in Lounge
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I clicked 100% because I am content that my ears will never be any better than my primary system. However, I wish I could could have better amplification than our Pioneer 7.1 receiver in that system that drives 4 Corn IIs , a home made Klipsch-based center and feeds a Rhythmik 12 sub; more like the transparency of my Sumo Electra II & Polaris II combo in my secondary system here in my study. If I was 20 or 30 years younger, that would be a priority but it's not.
The only one of our many music systems that is inferior to my own hearing is my garage system using a 70s RS receiver (cheap Pioneer in drag) driving RS Minimus 7 speakers.