LTC Electro Acoustic Model 50
Jstas
Posts: 14,821
I'll get pictures up later. Too busy being lazy right now.
Anyway, anybody ever heard of these guys?
The non-experts with expert opinions at other forums have told me that I'm crazy and these are from Canada from a company called Marsland. Couldn't be further from the truth.
All I know about these speakers is that they are from LTC Corporation out of Santa Ana, California. They are decidedly high fidelity speakers...or at least try to be. They aren't in the greatest shape and a couple drivers are gone because they were blown or something or other. They were given to me for free.
I'm trying to figure out what I can about them and see if they are worth fixing.
They have 3 drivers, a circuit breaker and an adjustable crossover knob. One of the drivers on each speaker is missing but they look like domes. It has some kind of "Energy Chamber" that has a patent number with it. Patent number: 3833085
Here's the patent info: http://www.freepatentsonline.com/3833085.html
Not much in the way of info on there or the PDF. Just lists the "Inventor" as Norman Leonard Thomasen and it was filed on March 21st, 1974.
That's about all I got on the info. I'll put pictures up later. In the meantime, does anyone know anything about these or at least anything about LTC corporation?
The name of the speaker is:
LTC Corporation Electro Acoustic LTC Model 50
Anyway, anybody ever heard of these guys?
The non-experts with expert opinions at other forums have told me that I'm crazy and these are from Canada from a company called Marsland. Couldn't be further from the truth.
All I know about these speakers is that they are from LTC Corporation out of Santa Ana, California. They are decidedly high fidelity speakers...or at least try to be. They aren't in the greatest shape and a couple drivers are gone because they were blown or something or other. They were given to me for free.
I'm trying to figure out what I can about them and see if they are worth fixing.
They have 3 drivers, a circuit breaker and an adjustable crossover knob. One of the drivers on each speaker is missing but they look like domes. It has some kind of "Energy Chamber" that has a patent number with it. Patent number: 3833085
Here's the patent info: http://www.freepatentsonline.com/3833085.html
Not much in the way of info on there or the PDF. Just lists the "Inventor" as Norman Leonard Thomasen and it was filed on March 21st, 1974.
That's about all I got on the info. I'll put pictures up later. In the meantime, does anyone know anything about these or at least anything about LTC corporation?
The name of the speaker is:
LTC Corporation Electro Acoustic LTC Model 50
Expert Moron Extraordinaire
You're just jealous 'cause the voices don't talk to you!
You're just jealous 'cause the voices don't talk to you!
Post edited by Jstas on
Comments
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Short lived production runs for the speakers, 1976-1980.
The LTC-25, 50, and 100 were the 'affordable' line, with corresponding MSRP's of $360, $480, and $680 / pair. They apparently had a higher end line, the TX series, made also from 76-80 with the TX-5 running $1100/pair, and TX-10 at $2190/pair.
I'd like to see a picture, just for grins. I don't think they are anything special, or there is really any money to be made, but that doesn't mean they aren't worth saving either.
Cheers,
RussCheck your lips at the door woman. Shake your hips like battleships. Yeah, all the white girls trip when I sing at Sunday service. -
Where did you find your info?
BTW, I took pictures last night but had to go rescue the GF's mom. Blown stater in the middle of a gas station parking lot. Had to get it towed. Didn't get home until 1AM. I'll try to get them up tonight.
Know where I can find drivers?
I was digging around the U.S. Patent Office website for info on stuff Mr. Thomasen had on file and I think I found the schematic for the particular driver setup. It looks like he's using dissimilar drivers in a pair to cancel out resonances and other coloration artifacts.
Thing is, the more I look through his patents, the more I see modern designs referencing this guy's work. He seems to be somewhat of an inspiration for alot of modern ideas/technology.
I think it'd be neat to get these restored and see how well his idea worked in the first iteration.Expert Moron Extraordinaire
You're just jealous 'cause the voices don't talk to you! -
Orion Blue Book. I had to go back to a 1999 hard copy. They are deleted out of the new one.
What's special about a first order crossover? Ground breaking?Check your lips at the door woman. Shake your hips like battleships. Yeah, all the white girls trip when I sing at Sunday service. -
Orion Blue Book. I had to go back to a 1999 hard copy. They are deleted out of the new one.
What's special about a first order crossover? Ground breaking?
Nothin'. He just seems to have two dissimilar drivers wired in parallel off of the same HF leads from the crossover.
Everyone has always told me that arranging drivers in that matter doesn't work. Or at least sounds like poo. But here's a guy who did it on a 1st order with no band separation for the individual drivers. He's running them balls to the wall from the crossover point straight up.
I just wonder, what's it sound like?Expert Moron Extraordinaire
You're just jealous 'cause the voices don't talk to you! -
Take a friggin pic already.Check your lips at the door woman. Shake your hips like battleships. Yeah, all the white girls trip when I sing at Sunday service.
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--Gary--
Onkyo Integra M504, Bottlehead Foreplay III, Denon SACD, Thiel CS2.3, NHT VT-2, VT-3 and Evolution T6, Infinity RSIIIa, SDA1C and a few dozen other speakers around the house I change in and out. -
Expert Moron Extraordinaire
You're just jealous 'cause the voices don't talk to you! -
Only when we need extra money.
"We"? You got a frog in your pocket?:eek: Speak for yourself!
--Gary--
Onkyo Integra M504, Bottlehead Foreplay III, Denon SACD, Thiel CS2.3, NHT VT-2, VT-3 and Evolution T6, Infinity RSIIIa, SDA1C and a few dozen other speakers around the house I change in and out. -
The crossover is a series type which is a config.apparently Polk used in some older design's.http://www.polkaudio.com/forums/showthread.php?p=1602657#post1602657
As for operating two completely different drivers over the same bandwidth it is a big no no.However this was designed long before the advent of computer aided simulation and measurement .In those days a lot of experimentation was taking place involving much guess work thus resulting it what now would be viewed as obviously flawed design practice. -
Look! Pictures!Expert Moron Extraordinaire
You're just jealous 'cause the voices don't talk to you! -
Interesting.
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So did someoone remove the other tweeter or is that stock?
Interesting looking speakers. -
Sell the alnico mag woofs and put the rest in the landfill.Check your lips at the door woman. Shake your hips like battleships. Yeah, all the white girls trip when I sing at Sunday service.
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I am surprised they didn't mirror them. Have you had a listen yet?
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So did someoone remove the other tweeter or is that stock?
Interesting looking speakers.
Dude, really?They aren't in the greatest shape and a couple drivers are gone because they were blown or something or other.I am surprised they didn't mirror them. Have you had a listen yet?
They didn't need to mirror them. Had two high frequency drivers, no need to mirror them with symmetrical drivers.Sell the alnico mag woofs and put the rest in the landfill.
I dunno. Seems like a waste. The cabinets are very well constructed and solid. No resonances at all. Even with no drivers, they just go "thud" where lots of other cabinets from the same time period will ring like a bell.
I'm going to play with them a bit before I do anything with them. It'd be nice to get some info on the tweeters. That "Made in Belgium" printing has me intrigued.
You don't have any more info on these?Expert Moron Extraordinaire
You're just jealous 'cause the voices don't talk to you! -
Oops, missed the missing driver part. I was too busy trying to find info other than what you found.
