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Old 20th August 2012, 07:45 AM   #41
Remlab is offline Remlab  United States
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Planet 10
Is this just hyperbole for a typical transmission line subwoofer, or is it something else?
http://www.wisdomaudio.com/pdfs/RTL.pdf
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Last edited by Remlab; 20th August 2012 at 07:56 AM.
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Old 20th August 2012, 08:03 AM   #42
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Why are there no measurements posted?
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Old 21st August 2012, 05:30 AM   #43
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Quote:
Originally Posted by Remlab View Post
Now that I think about it, this picture must have been with an earlier prototype. The current model uses a reticulated copper foam for the tweeter diaphragm. I wonder how they apply the voice coil to the foam? ERG: Duocel® copper Foam Properties
I'm not sure the foam looking copper IS the diaphragm.....

I downloaded the hi rez picture from Wisdom's website. It looks like it is just laying in front of the actual tweeter diaphragm.

I can't work out how it could be the transducer. Could it be placed in front of the tweeter diaphragm for some other purpose? Possibly a low pass filter, progressively attenuating higher frequencies. Or are all of those tiny chambers acting like diffusion at super high frequencies?

Greg
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Old 21st August 2012, 05:35 AM   #44
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Quote:
Originally Posted by Remlab View Post
Planet 10
Is this just hyperbole for a typical transmission line subwoofer, or is it something else?
http://www.wisdomaudio.com/pdfs/RTL.pdf
Is this really more like a tapped horn that Danley makes and the guys at AVS are so nuts about?

DTS 20 | Danley Sounds Labs | Danley Sound Labs, Inc.

Greg
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Old 21st August 2012, 06:22 AM   #45
Remlab is offline Remlab  United States
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This video explains the copper foam(Your right Greg, it's not the tweeter). Also, definitely looks like bonded logic behind the tweeter. probably the same for the larger panels. The amazing STS(Streamer trunk sized) subwoofer is also explained..
CEDIA 2011: Wisdom Audio Series LS4 Speaker Review - YouTube
Here is another enlightening video from The Newport show.
http://www.youtube.com/watch?v=uDkN9vxYnQ8
20,000 watts power handling @ 100db/1wm for the LS-4? WOW!
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Last edited by Remlab; 21st August 2012 at 06:41 AM.
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Old 21st August 2012, 06:56 AM   #46
Remlab is offline Remlab  United States
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Quote:
Originally Posted by Remlab View Post
This video explains the copper foam(Your right Greg, it's not the tweeter). Also, definitely looks like bonded logic behind the tweeter. probably the same for the larger panels. The amazing STS(Streamer trunk sized) subwoofer is also explained..
CEDIA 2011: Wisdom Audio Series LS4 Speaker Review - YouTube
Here is another enlightening video from The Newport show.
Wisdom Audio THE Show Newport - YouTube
20,000 watts power handling @ 100db/1wm for the LS-4? WOW!
Just did the math. That's 143db!!
I did a typo on the STS, it's "Steamer" not streamer..
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Last edited by Remlab; 21st August 2012 at 07:03 AM.
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Old 22nd August 2012, 09:05 PM   #47
jeno is offline jeno  Norway
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Originally Posted by Remlab View Post
100db/1wm is inefficient? I read somewhere that they use a 1 ton press to connect the two sides of each module before riveting..
http://www.wisdomaudio.com/pdfs/LS4-&-LS3-Brochure.pdf
Here is a quote from Todd Sutherland, VP Marketing, Wisdom Audio:

The original design concept by David Graebener used all neodymium magnets and the sensitivity was way too high, up around 115dB! Those of us that actually have to sell these things had to talk David down to using a combination of ceramic and neo magnets to bring the sensitivity down to 100dB for the LS4.

Sneak Peak at Wisdom Audio's $40,000-per-channel "Wilson Killers" -
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Old 22nd August 2012, 09:16 PM   #48
jeno is offline jeno  Norway
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Quote:
Originally Posted by Remlab View Post
Planet 10
Is this just hyperbole for a typical transmission line subwoofer, or is it something else?
http://www.wisdomaudio.com/pdfs/RTL.pdf
According to Tom Danley it is a tapped horn:

Wisdom Audio's New LS3 and LS4 Planar Magnetic Speakers
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Old 22nd August 2012, 10:43 PM   #49
Remlab is offline Remlab  United States
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Originally Posted by jeno View Post
According to Tom Danley it is a tapped horn:

Wisdom Audio's New LS3 and LS4 Planar Magnetic Speakers
AH HA! So that's why Wisdom posted a 1956 patent on their website. To show that it is an old concept developed by William Glenn.
http://www.wisdomaudio.com/pdfs/US2765864.pdf
AES paper by(Namesake) Peter Tappan 1959..
http://www.wisdomaudio.com/pdfs/Tapp...sflex10305.pdf
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Last edited by Remlab; 22nd August 2012 at 10:58 PM.
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Old 24th August 2012, 07:48 AM   #50
Remlab is offline Remlab  United States
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I wonder if you could make a poor(OK, Middle class) man's version of the LS-4 with an RD-75 (or nine Neo 8's) and 14 Neo10's. It wouldn't be as efficient, but it would be pretty much the same basic technology that could also be crossed over at the same 750 hz point and with about a 4000w peak power handling ability(with the Neo 8's). It could also probably do around 80hz. All for only $8,000 a pair(With a good dsp crossover added).. WHOOPEE!
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Last edited by Remlab; 24th August 2012 at 08:16 AM.
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