Dave A
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Posts posted by Dave A
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15 minutes ago, Greg_M said:
I guess it must be a slow news ....month and this is all they have to talk about.
I think it is more than that. They are paid to talk about it in my opinion. A result of TDS agit prop and the Rahm Emanuel idea that you never let a crisis go to waste.
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25 minutes ago, Marvel said:
How old is that? Fox News?
The WHO has 1678 confirmed cases of Covid-19 in the US and 41 deaths as of yesterday afternoon. We just haven't tested enough people.
Another source has 2952 cases and 57 deaths, but this also includes all the US territories.
As testing actually is done, the numbers will ramp upward.
Well taking the 57 in Wuhan virus numbers in only 59,941 more deaths we will have reached the flu level of 2017-18. Last "pandemic" was the swine flu of 2009 where roughly 12,000 died and why did we not put our lives on hold back then and freak out with panic buying and all the garbage going on today. I hope the vestiges of any credibility network news like CNN BSNBC ABC etal is gone when this is done. There is a serious difference between reporting the news and making the news to fit an agenda or sell advertising time based on viewer share. Where was their freakout over the flu a couple of years ago too now that I think about it. I trust nothing any of these people say on TV anymore.
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Also make sure you don't marry a lady with potted plants everywhere.
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Depends on what they want to say.
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So how many pre-mumps versions were there?
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5 minutes ago, Chris A said:
I think that the local horn expansion irregularity at about 2/3 of the distance to the mouth is more than likely an artifact of how the horn expansion was laid out
Entirely possible. The blend where the straight section would meet a three point arc is hard to do well in some software and depending on the age of the part CAD has advanced to allow for much better surfacing over the years. It can also be as simple as the designer fudged his surfaces because he did not know how to do a seamless join. You just never know unless you were there to see why decisions were made.
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On 2/19/2020 at 12:21 PM, Mallette said:
Every speaker spaced out means more expertise has to be brought to bear to ensure that the amplified sound arrives with maximum timing correction to each location. Otherwise, you make the situation worse by having those with compromised hearing further confused by timing errors. One of the first Heresy ads featured a single Heresy mounted high above about a 350 reverberant sanctuary and the headline was "everybody thought the minister was just speaking louder." It is my parish, and the speaker still hangs there and is still acoustically invisible. Point is, it is NOT the number of speakers...which can make things worse, but their location and certainly their absolute accuracy that makes the difference. If you immediately detect the speakers as the source of what you are hearing, you need a better engineer.
Dave
Right on the money here. I bought two sets of Kp-262's from a church in Knoxville. They were replacing them with something that sounded better. The SLV people there were terrible and had rewired a couple incorrectly and sloppy work with crimp connectors loose on the wires. One had actually fallen out and no wonder they sounded bad.
Setting them up to sound good in your environment is another problem. I was not asked about speakers when our church bought JBL's and I only told my Pastor one time what I thought of those dog barkers. Like many outfits this SLV company sold him on a system and then could not integrate them well with the sanctuary. There is not one bit of timing on anything.
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Made by Eminence by the way and Roger has the only two places I know where these were used shown. For a one inch throat driver these are over achievers.
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Ayup, that's the title of this thread. Some time back when the virtues of MDF VS Baltic Birch raged I had threatened to do a bottle test. A chunk of each in a jar of water and pictures of daily progress made on the condition of each. Of course the idea that a speaker would be immersed in water is ridiculous to all but those with broken pipes or flooding or leaky roofs. Or buyers of used speakers. Immersion is not required to ruin MDF though and after buying and selling and looking at but not buying probably over a couple hundred sets of Klipsch now I know where quality is present and where it is not.
In any case I have had in my wood torture laboratory a piece of 18mm Baltic under the wheel of my trailer tongue jack. Outside and lonely and subject to laying flat on the ground and wet and frozen and neglected for probably four months now it toils on without complaining. It also does so without rotting and delaminating and the real surprise is that it has not deformed under the trailer tongue weight after all this time.
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Here are some pictures of the new horn I got and one of the old 510's with problems. The two with the mouth looking at you shows the busted out screw hole and canted hole pattern rotated slightly counter clockwise. Mounting flange is seriously sloped and broken on one spot where the uneven flange surface was pulled down to the driver or just dropped but this one was still mounted to the driver when I noticed it so who knows. As disgusted as I was by then I did not peel the cork off to see and nothing else is precise on this so I suspect the flange. Twice as thick as the new ones and almost looks like it was hand formed in places. The two 402 horns I have by comparison are superbly made and quite precise and uniform relative to each other.
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Great and I will start looking. I have solder and a heavy duty soldering iron on order and thanks for the tips.
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15 minutes ago, Edgar said:
Needs more solder.
Once Jeffrey blesses the design I can get busy soldering.
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3 hours ago, boom3 said:
Printed Circuit Board. A four lead component can be mechanically more stable. The WIMA box caps are indeed very good and very popular with rebuilders of vintage guitar amps to replace Orange Drops, Black Beauties and the like
What I wanted to know was what the four lead thing was since capacitors I have used are two leads.
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Anybody try to get their Super 8 money back yet?
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Sometimes you get lucky by accident. I have not been at all happy with my pile of 510's and the stock OEM two way crossover with the 904 bass bin and B&Cde75 driver on the horn. Had a K-60-M with a bad diaphragm I just found out about and a newly recapped KP-450 HF crossover. OK it's a two way and so I stick it on one of those 510/DE75 combos on that HF crossover and man did it sound good. I now have a sweet sounding passive setup and will probably just make some up and do the rest this way too. Makes me wonder what the KPT-456 sounds like and I will try that tomorrow.
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I saw that one and the phase plug is not the same as an OEM. Cheap for sure though but might take a month or two or three to get here from China. Wonder if it comes with a sample of disinfectant?
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Jeffrey, I have my basic crossover layout done. Can you tell me if this looks right?
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Last time I take someones word for condition. Anyway I have a bad diaphragm and need one or a driver and want to spend as little as possible. This rebuild is already eating me alive.
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OK then how to I take what I see on your system crossover and apply it to these different drivers. Please be specific as if you will remember I started this thread to talk about the KPT-100 crossover which is the problem I am trying to solve today.
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3 minutes ago, PrestonTom said:
Chris, I am sure you know this already .... If you take a straight edge to the inside of the horn near the throat, the angle re: the mounting flange will be straight contour with an angle of about 45deg. If you "roll" the straight edge along the contour (toward the mouth), then at about 2/3 of the way out (toward the mouth), that angle becomes about 55-60 deg for about a half inch. This second straight portion then transitions smoothy to final curve.
This "discontinuity" at one time had been referred to as the "bump" (not to be confused with the mumps). I was told it was to help control the dispersion at the higher frequencies. I do not see the bump in the photos posted for the zxpc horns. Maybe the photo/lighting is not clear enough? I don't know. As of right now, however, I don't think these are a careful clone or "leftovers" from the factory.
Measuring the polars is a great idea. I am a bit concerned about the influence of the more modern phase plugs on the polars at the highest frequencies. IOW, the newer phase plugs are helping to limit the narrower dispersion which can occur at the highest frequencies (the older ones did not and were narrower at the top octave). IOW, any benefits of the "bump" may be swamped by the benefits provided with the new phase plugs.
We gone far off topic at this point, but I wanted make sure others appreciated some of the subtle features that Roy designed into his modified tractrix horns (although my knowledge is far from perfect).
Good Luck,
-Tom
Which version of the 510 are you talking about?
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1 minute ago, Jeffrey D. Medwin said:
No, the multiple caps are in parallel.
How would "I" simplify it? See my system .
Right but that is for an Altec A7 with entirely different drivers. Are you saying that it is a universal crossover for all two way systems irregardless of the drivers?
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So just wire these in series with one or all the the existing capacitors? I am not asking for help to build an amp here but just for a crossover. You mentioned that this crossover was to complicated and you did not build them that way. How would you simplify it?
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2 hours ago, jjptkd said:
I think you have the older original version of the 510 I just checked the horns I have on hand and they are exactly the same. The one with the bug screen is a factory Klipsch k-510
Older for sure as mine looks nothing like that. As bad as the old 510's are and as cheap as these new ones are I think I will replace them if the new ones test good. Ought to be able to sell the old ones for at least what the new ones will cost if the new ones test good.
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OK what would you replace this crossover with? I see your picture but there was no schematic so I don't know what you did.
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Corona Virus Disease/(SARS-CoV-2) II
in Lounge
Posted
China is a very sick country and I mean the fundamentals that make a strong long future outlook possible. The health problems coming down the pike from pollution are just beginning in a population that has way to many old people in it from their ZPG mindset. They are worse than the people in the USA about having enough children to maintain and grow their population. Modern manufacturing is very efficient and right now part of the reason manufacturing is coming back to the USA is fewer people needed to make things. The ratio of men to women is out of whack. Plus for the first time they have let a down trodden serf class of people taste weatlh and they see the world on the internet and they read about Hong Kong and Taiwan and want what they have and not what the Chinese overlords want them to have. China is headed for real and serious problems and they can't avoid these things of their own making.
Really nice of them to give Joe 6Pack and college professors here in the USA a clear demonstration of what Trump has been saying for some time now. The Chinese threat to cut off out medicines reveals for all to see in a way that cant be hidden or ignored the folly of sending our manufacturing overseas to those who have been traditional enemies for some time now. Totalitarian communists VS the USA constitutional form of government and the two can't intermingle without one of them losing it's identity.