Edgar
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Posts posted by Edgar
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What Greg sent you earlier was the specs on the CW1526C (Cast Frame) woofer. Here are the numbers for the CW1526 (Stamped Frame) woofer.
CW1526 (stamped) in black, CW1526C (cast) in gray.
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Yes, I see that quicker drop off, but it's not what I heard with those woofers in the Russian Khorns.
When theory and reality disagree, I'd go with reality.
Could you plot the graph with the CW1526C and the PD1550?
CW1526 in black, PD1550 in gray.
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Not quite. The graph shows each woofer's output for a 2.83V input. So the CW1526C plays a few dB louder than the K33E overall, but its frequency response in the horn is very similar to the K33E. If you look at the other graphs posted earlier, you'll see that those woofers are a little louder above 400 Hz or so than the K33E, but that their bass responses drop-off at a higher frequency ... maybe 46-47 Hz vs. 41-42 Hz for the K33E. Since low bass response is what we're trying to get out of the KHorn, this difference is significant.
Greg
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Perhaps you could post the input parameters page you are using in Hornresp?
Sure. The dimensions represent my best estimates, based upon some old Speakerlab K plans that I have. While there is some debate as to the dimensional accuracy of these plans, for the Hornresp parameters they are probably more accurate than my ability to extract the data from them. Also, since all four woofers are being compared in the same context, at least the relative differences between them should be accurate.
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Okay, here's what Hornresp gives for the CW1526. Again, K33E in gray for comparison.
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The charts are great, not much of a difference between the two really.
Doesn't look like much difference, but they both lose 5-6 Hz on the low end compared with the Klipsch woofer. That's actually a lot.
I wonder how the Crites cast-frame woofers would look overlayed on that chart?
If you can post the Thiele/Small parameters, I can run it through Hornresp.
Greg
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And here's the PD1550.
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FWIW, here's what Hornresp predicts for the PD158 in the KHorn (K33E in gray, for comparison).<\P>
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I'd like to know the back story behind this. Was Verizon was sending him bills for 0.2¢?
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Is that e^(2*PI) or e^(i*PI)? I can't quite make it out in the picture. If it's e^(i*PI) then it equals -1, and the check is made out for two-tenths of one cent.
Greg
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Everything that you could possibly need for these can be found at Great Plains Audio. In particular, see Note 5 on the page referenced.
Greg
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The Munster daughter the blond but I can't remember her name.
Marilyn, their niece.
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We should also poll Wilma versus Betty.
Jennifer (Loni Anderson) or Bailey (Jan Smithers)?
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Got an email message from my sister, who lives just west of St. Louis, saying that it woke her up this morning.
http://earthquake.usgs.gov/eqcenter/recenteqsus/Quakes/nmhwb0418a.php
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A few months ago I signed up for a Comcast special deal; cable TV, internet, and VOIP telephone for $99. The deal also included free HBO, but I didn't care at all about that, so Comcast didn't bother to give me a cable box since I wouldn't use it anyway. When the first bill came in, it was a whole lot more than $99, so I called to find out what was going on. They checked into the matter and found out that because I did NOT have a cable box, the $99 deal didn't apply and I had to pay the regular price for each of the three services. To get the $99 deal I HAD to take a cable box.
It sits in the closet, unused.
Greg
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I am an engineer who had the opportunity to visit Bose in an "official" capacity several years ago. I discovered some very interesting things.
1) Bose has a lot of money, and as a result they have some of the BEST engineering tools I've ever encountered anywhere.
2) Bose builds toys. That's not intended to be an insult. Mattel builds toys, too, and there can be some real high-tech involved. So if you think of Bose as a manufacturer of "high-tech toys", many things start to make sense that didn't in other contexts.
3) (I only have this story second-hand.) Apparently many years ago Mark IV Audio (parent company, at the time, of Altec Lansing, Electro-Voice, University, Dynacord, Klark-Teknik) employed a leading industry guru in "auralization" technology -- 3D modeling of acoustic spaces. At some time he was hired away from Mark IV by ... Bose. I wish I could remember his name.
Greg
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Last time my body was in that position while riding a motorcycle, it was a dirt bike, and I was upside-down (but the bike was rightside-up).
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I'm in Northern Vermont, so I can identify. I'm so fed up with Winter. I just got off the phone with someone who has a job in San Diego. It's so tempting.
Greg
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so maybe I'm the only one to have a bad experience with glass tops?
No, you're right; they really do require special care to prevent breakage or scratching.
Anyway for the original poster, keep in mind your cooking technique when selecting your machine! And choose your pots and pans accordingly, glass tops do need really flat bottoms to work efficiently.
Yes, I forgot to mention that. I have an old spaghetti pot with a very unflat bottom, and cannot even bring water to a boil in it on a glass top. But flat bottom pots are not difficult to find nowadays.
Greg
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I don't agree on flat tops. We cook up a storm all the time and have no significant issues with scratching. We use cast iron and I admit we are cautious with it, but I'm always more concerned about banging the sink up moreso than the cooktop. You do need some cleaner for the cooktop, I don't know what's in it but it sure works good. I think maybe the newer surfaces are better than many years ago. Plus cleanup is a zillion times easier.
I'm with you on glass flat tops. I've used gas, coil electric, and glass electric, and my favorite by far is glass electric. You have to be careful not to drop pots on or scrape them across the surface, but for me the ease of clean-up and good looks make it worth the effort.
I never bothered with special cleaners. Dawn dish soap and water for most clean-up, burned-on food comes off with a razor-scraper followed by a bit of extra-fine polishing compound (the same kind you use to buff-out the paint job on a car) and some elbow-grease. Any streaks left behind clean-up with Windex.
Greg
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I use Opera, so I'm in the same predicament. I have to insert explicit commands for line breaks, etc., and inserting URLs is a real pain.
For others in the same boat, here are a couple of basic commands. Be sure to include the < and > symbols.
For a line break, type <BR>.
For a new paragraph, type <P> before the first word and </P> after the last word.
For lots of other commands, go to: http://www.w3schools.com/html/html_primary.asp.
Greg
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Make certain that the concrete is absolutely dry. Get a can of waterless hand cleaner such as Goop or GoJo. Apply liberally to the spot by hand (the cream will become liquidy -- that's good) and rub it in with a brush. Let it soak for fifteen minutes or so. Hose off. It might be necessary to repeat the process one or more times, just make certain that the concrete is dry before reapplying.
Greg
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I haven't dug into the HORNRESP model to understand what it is modeling and what assumptions it is making. I have seen that real horns have response that is typically outside of the passband predicted in the models. I'll leave those arguments to the pundits online here.
The model seems to do reasonably well between about 70 Hz and about 400 Hz. Below that, perhaps system resonances come into play. Above that, perhaps the effects of horn folding come into play. That's just conjecture on my part.
Greg
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Interesting. Here's my HORNRESP models of KHorn (black) and Jubilee (gray), 4p (anechoic), compared with the measurements. Horizontal scales are approximately the same; vertical scales very different.
Will these woofers work in Khorns?
in Technical/Restorations
Posted
Fs = 34.46 Hz
Vas = 10.65 cubic feet
Qts = 0.39
It looks like I'm using the post-1985 numbers
It has been quite a long time since I created that Hornresp model, and frankly I don't remember where I found all of the other parameters. I think that someone posted a complete set in a forum message a while back.
Greg