Dave A
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Posts posted by Dave A
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Reading this morning about the Swine Flu and all those resultant deaths. Somehow the media back then did not go into hyper sensationalism mode but today they do. Half the leadership and most of the media appear to disdain the idea of America and are the reason all this nonsense is going on. TDS first and only and the heck with the USA.
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6 minutes ago, PrestonTom said:
What Dave referred to as the "bulge" is the main difference I noticed. It is lacking, as far as I can tell, in the photos. The anecdotes I heard regarded this "bulge". My understanding is that it was certainly deliberate and not a manufacturing anomaly.
IIRC, it was there to better control dispersion at the higher frequencies. Whether it has a big effect or not, I have no idea.
I leaned towards the bulge being deliberate but as crude as these 510's I have are I was not sure.
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2 hours ago, DizRotus said:
I was at the dentist recently. Her assistant put on rubber gloves and then promptly reached his gloved hand into his pocket to pull out his phone. I would have said something if my mouth weren’t full of her gloved fingers. He did not touch me with his phone contaminated rubber glove. I would have prevented it had he tried.
I know machinists now who use those all the time. Not for germs but because tools don't slip as easily and it keeps coolant off their hands. My mail carrier got in the habit of using them during one of the recent panics and kept doing so because it was easier to sort and handle mail with them.
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On 3/13/2020 at 7:33 AM, Madman1 said:
Hey Dave, just curious why didn’t you use the Dayton’s for these?
It's pretty space restricted on that little PC board.
On 3/13/2020 at 8:03 AM, glens said:Is your meter in proper calibration?
Yes and that calibration you mention would still show variance even if it was off. It shows the 20 year old TI's to measure the same as today's Erse's did.
20 hours ago, boom3 said:The basic chemistry of electrolytics has not changed in about 75 years, so there are various tolerances of 'lytics but at the end of the day, a lytic is a lytic is a lytic. . Solen polypropylenes are not expensive and sound just fine.
Yes and I am looking for a good tolerance electrolytic that beats the 20 year old ones. I need the smaller size here if I can find something worthwhile.
13 hours ago, boom3 said:The four lead box looks good for a PCB based crossover.
OK could you tell me what that means?
10 hours ago, Jeffrey D. Medwin said:Bypass EACH of the basic larger value WIMA MKP4s with a 0.22uF FKP1 WIMA at 1250 VDC, a 0.022 uF FKP1 at 1250 VDC , and a WIMA FKP2 0.01 at 630 VDC, and P.M. me as to what it sounds like to you !! You'll fall in love, I bet !! SHORT lead lengths.
I think I will pass on that.
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Got a pair in and side by side they are different. The mouth of the EBay horn has a sharp corner where it meets the mounting flange and the 510's I have are rounded there. The throat has as shown a square cutout like area like the 402 horn does and again my 510's don't have. Sharp corners EBay and rounded corners 510 from throat to mouth. The EBay horns are a more precision made product and all the mounting holes are in the same distance from the edge. There is a basic rectangular mounting hole pattern to the screw holes on both. The 510 I was looking at was canted slightly making some holes closer to the edge and some not. One of the 510 holes in that severely brittle material has cracked a chunk out because it was to close to the edge. The driver mounting flange on one 510 I have loose was not flat and when the driver was pulled in snug the flange cracked around one hole. The two EBay horns were flat in this area. The general slope on the top and bottom sides of the 510 have a bulge in there and I can't tell if this was by design or if the material has warped during cooling from molding or time. The same surfaces on the EBay horn are far more uniform and do not have this bulge. The 510's seem to be thicker and better braced with external ribs on the back side.
I don't know what on the 510 horn is by design or accepted as manufacturing variance tolerances, which appear to be pretty sloppy, or if that was state of the art for that type of plastic at that time. These 510 horns I have, all eight whole and three broken ones, are no where near as precision as my two 402 horns are and just look crude. Also I don't have enough experience with the 510 horns to know if what I have was peculiar to production at that time and later horns were made better. These were made in that same time frame as those 402 horns which would sag and deform under heat so there were known issues from then with some Klipsch molded horns. If I was a large commercial customer with the inevitable breakage that would occur with this brittle stuff these horns I have were made of I would have been complaining.
How these will measure for sound I will leave others to figure out but in all honesty those old 510 horns I have leave a lot to be desired on manufacturing consistency and product durability. These EBay horns are kind of a mix of 402's and 510's.
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The cost of making molds has declined a lot with the advancement of machining and design software. A molding outfit with in house design build and molding capabilities wont have much trouble with a mold this size. The 402 however IS a different animal and that one does have a much more serious start up cost and very limited market. Reverse engineering is also cheap now and $500 bucks can buy a scan to 3D cad part file for things as basic as a 510 horn here in the USA.
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I have no doubt these are made in China. After the patents are expired anyone can make them though and I think that is the case with the original 510 and also the 402.
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Talk to me.
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Working on some KPT 100 and 200 crossovers and wanting to replace those old TI electrolytic caps. The problem I am having is the new Erse caps have just as high ESR as the 20 year old TI's do. Kind of sad really that 15 and 25uf new Erse caps are measuring at least .3+ ESR. Any suggestions for better ones? I have a hard time believing those Erse's are state of the art and no better than the old caps are.
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Just now, jimjimbo said:
That's what they all say.....
Seeing is believing though.
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15 minutes ago, DrumNBassNThePlace said:
The general consensus here will be that direct radiators are garbage with tons of distortion and so forth, but personally I think you have some great choices picked out there. If you can build and you have space, I guess that would expand your options significantly. Depends on what kind of output, spade, budget and frequency response you see looking for as well. Sounds like you are lookign for high output that digs deep and space isn't a huge issue.
Well I have a great big horn but you will never get me to say something like those 904's are bad. The 904's good and a set of KP-450's is what really started me down the pro gear path.
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1 minute ago, DrumNBassNThePlace said:
Really? I am not a large fella whatsoever and I can lift those by myself.... The other thing you can do is place each speaker on a moving blanket and drag it. If it's too heavy, you can roll it gently end to end as well until you get it onto a moving blanket.
Heck I just lift the Chorus speakers up by hand and a two wheeler does for the 904's. Nice big rubber feet on the 904's allows for easily slipping a two wheeler under them. I will say there is something to watch out for lifting Chorus speakers up. If the base is loose it can come off if you are using it to carry by. Almost lost one that way.
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1 hour ago, Simon830 said:
It seems like theres a strong chance of me getting a pair of the 396s. They are very capable, easier to handle, cheaper and easier to set up. Paired with sum beefy subwoofers, I am sure I will be very happy.
What sort of subwoofers do you guys recommend? I am looking hard at building a couple GSG Devastators, but also looking at PSA dual 18s and JTR dual 18 subs.
Try to hear your potential choices ahead of time if you can and make your decision an informed one.
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42 minutes ago, Jeff Matthews said:
I assume real, actual experts were involved in quarantining much of China, shutting down factories, welding doors of infected people shut so people can't come and go, removing infected people involuntarily from their homes, etc.
It's not at that stage over here, but at least we have seen a glimpse of how bad it can get. No panic on my part, but I'm not scoffing at it, either.
I saw those videos too but then the Chinese govt turns around and says out of 1.3 billion people they report (https://www.worldometers.info/coronavirus/) less than 100,000 and 3,158 deaths. So who is telling the truth and where does one find the truth? For something that is supposed to be a huge threat to the human race there is an unprecedented amount of pure misinformation and smoke screens every where. If this is a deadly threat to the world why not clear the air and make the facts known. Some day there will be a real pandemic and these people who obfuscate the truth for whatever reason are not doing any of us a favor. I get tired of being lied to by everyone and tend to dismiss hyperbole until I see proof.
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7 minutes ago, Chad said:
Bunch of "armchair infectious disease experts" 'round these parts (and by that I mean all over the internet and probably most U.S. communities).
I think the smartest thing to do is understand this is super early in the timeline of the outbreak. Is it time to freak out and hoard all the TP (seriously what is that about)? Probably not. Is it time to be nonchalant about it? Hell no. The media certainly ain't helping at all.
Let's listen to actual science and to people who have spent the better parts of their lives actually studying these types of things, rather than dismiss it as being overblown though. That Joe Rogan podcast snippet linked above is a good example of real information we should probably pay attention to. Don't listen to the "entertainment news" or our politicians. Get your info from the real actual experts.
Well stated. I am watching to see if this is a real peril or not and will react accordingly.
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5 hours ago, CECAA850 said:
China is a cesspool of germs. Safety and hygiene are second thoughts. It's the perfect storm for something like this to occur. No i don't think the US will be affected in the same manner.
One of the interesting first attempts at identifying groups that were more susceptible to this stated there was a corollary between the absurdly high rates of male cigarette smokers in China and vulnerability to Wuhan. Now I would add to that the worst pollution in the world so in essence they have compromised immune systems due to all the toxins they breathe all the time. Air pollution is beyond belief there. There is nothing on our worst days for pollution here that is anywhere close to major urban centers in China every day. Here is a web site that racks current pollution levels world wide. https://aqicn.org/map/world/ Any areas in particular that might stand out here? Also note that Iran has the worst high air pollution levels among Arabic nations. Now the interesting thing about the daily tracking for Wuhan right now is that so much of industry is shut down their current daily air pollution levels are no where near as deadly as normal.
Also note the following. https://www.eurasiareview.com/01022020-polluted-air-could-be-an-important-cause-of-wuhan-pneumonia-oped/
Italy as noted elsewhere has the highest elderly population in Europe and like the elderly everywhere they have more problems with flu. An old folks home in WA is where the worst problems to date arose in the USA.
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1 minute ago, Marvel said:
All very true Mike. What I was using were reported numbers from the WHO, but deaths and overall totals are going up every day. There may be way more infected but with no symptoms, which would lower the mortality rate percentage.
Yes they are just like the flu. See the problem with sensationalism is perspective is thrown out the window and people forget the 600,000+ killed from flu every year. Every year. Where is the freakout over all that and somehow when 60,000+ died in the USA from flu 2017-18 it did not stop trade, events or lives. I fully intend to live a normal life and have no concerns until I see something to worry about.I am puzzled why people allow the media to take such control of their lives and cause them to forget perspective and history.
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Just now, jimjimbo said:
Pretty sure that's the plan!
If it wasn't it is now and we will remove the wuhan virus from Hope!
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1 hour ago, richieb said:
Note to self - Don’t forget earplugs - 🙉Heh heh, I will be turning it up for others. I already know what they are like. Although I have to admit I want to put them outside on that covered area at the and of the building and turn them up. I just want to see what they will do.
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56 minutes ago, HDBRbuilder said:
Well...let's just say that this is the first time in MY MEMORY where the U.S. military has locked-down travel of personnel and family members both to and from the bases in Italy and South Korea due to an overwhelmingly rapid spread of an illness! This includes personnel and families scheduled for re-assignment who have already shipped their belongings, along with mandatory-attendance career-progression-schools that require a return the USA to attend! In Italy, both Aviano AFB is locked down and so is Caserme Ederle in Vicenza, which is home station for the Army's 173rd Airborne Brigade Combat Team, our Quick Reaction Force for Europe, North Africa, and the Middle East! It's gotta be REALLY BAD there for THAT to happen! Trust me, I know! I served in Vicenza 1973-1976 when the QRF for that entire region was JUST an Airborne Battalion Combat Team, and we trained whether we were sick or not!
I am like Carl and looking for evidence. Is this worse than the propagation rate of a bad strain of flu? The numbers in South Korea and China and Italy are nothing compared to population and normal flu deaths.
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I intend to kill the virus with sound waves. I hope to sterilize the whole building.
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Booked a room today and will arrive on Wednesday. Available to help anyone unload and setup Thursday at any time. The earlier we can get access the better as far as I am concerned.
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4 hours ago, Chris A said:
You're talking about the K-691 driver? Or perhaps the 1132?
Chris
Both. The 1132 was I think the first one to have this and you will hear a set in Hope soon. If I remember right they are in other drivers now too and I think that includes the 691. Perhaps Roy will chime in here.
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5 hours ago, Chris A said:
The mumps version of the K-510 has a little waist-banding below 2000 Hz in the horizontal axis, so this new ZXPC horn (which looks like an old mumps-less K-510 knockoff) will have more issues in that regard:
Chris
What those horns will not have is the drivers with Roy's new phase plugs to put in them. That new tractix phase plug really changes things and Klipsch has many years left on that one.
electrolytic capacitors
in Technical/Restorations
Posted
OK Jeffrey here is the crossover in question I am working on. I am somewhat intrigued by your approach and wonder how you would improve upon this one.