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Old 20th September 2019, 03:16 PM   #9971
SamAnytime is offline SamAnytime  India
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Quote:
Originally Posted by Barniboy View Post
Perhaps I can be of assistance.
Tube amps are characterised by having transformers in the output stage, in order to adapt the tubes inherent high impedance to the loudspeakers inherent low impedance.
Transformers can not pass a DC voltage, which I am sure is your concern.
Thus, in such case, an isolating capacitor should not be necessary.

Single-ended transistor amplifiers already have an isolating capacitor in the output, so in this case too an extra capacitor should not be necessary.

Push-Pull transistor amplifiers however, deserves some attention:
Two output devices are suspended between the pos. and neg. supply rails respectively. If ONE of the devices (or associated circuitry) decides to blow, it is almost certain that the output will smack out to one or the other supply rail, depending on a short or an open circuit.
With such amp. it could be an idea to include an isolating capacitor indeed.
Strangely, one sometimes see mini-fuses on-board the PCB in each supply of the amplifier !
So a 50 cent fuse, deciding to blow, will fry a 500$ loudspeaker.

Ironically, class D amps actually do switch between supply rails, though very fast. An isolating/smoothing inductor keep things ample for loudspeaker use.
However, the class D amps I have worked with all had a high level and high frequency carrier superimposed to the output.
So a large voice coil inductance is definitely necessary to quench this and dissipate a few watts.
A woofers coil is probably OK for this, but a fine tweeter ?
I wouldŽnt use class D amps for active filtering, except for woofers which I already do.
Excellent. Just one possible caveat: there is a relatively rare family of tube amps that are OTL (output transformerless). Julius Futterman and Bruce Rosenblit seem to be the big names in this field.
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Old 20th September 2019, 04:58 PM   #9972
SamAnytime is offline SamAnytime  India
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^^ Andrea Ciuffoli - Home Page


Perhaps an admin will kindly merge this link into the post above.
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Old 21st September 2019, 06:08 AM   #9973
David McBean is offline David McBean  Australia
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Quote:
Originally Posted by 1hiep0 View Post
Could the Unity Horn be simmed in Hornresp? better yet 3 ways Unity where the woofer is in the horn?
Hi 1hiep0,

Both two-way and three-way systems can be simulated. A representative example of a multiple entry horn system can be specified using the Input Wizard accessed from under the Input Parameters window Help menu. The record parameter values can then be changed to match the actual design. Read the "Multiple Entry Horn Wizard" and "Two-Way or Three-Way Multiple Entry Horn" sections in the Help file to better understand how a multiple entry type system is specified in Hornresp.

Kind regards,

David
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Old 21st September 2019, 04:24 PM   #9974
1hiep0 is offline 1hiep0  United States
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Default difference?

Quote:
Originally Posted by David McBean View Post

Read the "Multiple Entry Horn Wizard" and "Two-Way or Three-Way Multiple Entry Horn" sections in the Help ........
David
Thank, I got that, essentially the same as Synergy Horn. I am wondering what is the difference as always thinking the Synergy is straight horn wall and Unity is curve horn wall.
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Old 22nd September 2019, 02:36 AM   #9975
cowanaudio is offline cowanaudio  Australia
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Read the patents and you will end up just as confused as the rest of us. The synergy patent appears to be an attempt to protect some of Toms IP after he moved from SPL to Danley Sound Labs. The Unity and Synergy patents are very similar. The Unity patent has now expired. I doubt the current patent could stand up to a challenge in court.
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Old 22nd September 2019, 08:19 AM   #9976
David McBean is offline David McBean  Australia
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Default Hornresp Update 5040-190922

Hi Everyone,

BUG FIX 1

The following sequence of events would produce an incorrect schematic diagram for a mass loaded transmission line loudspeaker in the Input Wizard. This has now been fixed. Attachment 1 shows the incorrect schematic, Attachment 2 shows the correct schematic.

Free space
Next
Direct radiator
Next
Closed box
Next
Offset driver
Next
Back
Back
Transmission line
Next
Mass loaded
Next
Next
Next
Next
Incorrect schematic

BUG FIX 2

For band pass loudspeaker systems, the initial baseline port velocities were not exactly the same as those for the initial calculated results. This has now been fixed. Attachment 3 shows the incorrect results, Attachment 4 shows the correct results. In the correct results the grey baseline trace can no longer be seen because it is identical to, and hidden behind, the light red trace.

Kind regards,

David
Attached Images
File Type: png Attach_1.png (32.4 KB, 115 views)
File Type: png Attach_2.png (37.9 KB, 118 views)
File Type: png Attach_3.png (58.0 KB, 18 views)
File Type: png Attach_4.png (57.6 KB, 16 views)
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Last edited by David McBean; 22nd September 2019 at 08:46 AM.
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Old 22nd September 2019, 11:30 AM   #9977
mwmkravchenko is offline mwmkravchenko  Canada
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Quote:
Originally Posted by cowanaudio View Post
Read the patents and you will end up just as confused as the rest of us. The synergy patent appears to be an attempt to protect some of Toms IP after he moved from SPL to Danley Sound Labs. The Unity and Synergy patents are very similar. The Unity patent has now expired. I doubt the current patent could stand up to a challenge in court.

I completely agree with your comment.

You can blame Tom for trying to get some sort of protection for his work. The true problem is that it really isn't really original in the sense that it hasn't been accomplished before. There many patents that are long expired that cover the various points of form and function that are used in the synergy loudspeakers.
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Old 22nd September 2019, 04:57 PM   #9978
whgeiger is offline whgeiger  United States
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Default Non-Issue

Quote:
Originally Posted by mwmkravchenko View Post
I completely agree with your comment.

You can blame Tom for trying to get some sort of protection for his work. The true problem is that it really isn't really original in the sense that it hasn't been accomplished before. There many patents that are long expired that cover the various points of form and function that are used in the synergy loudspeakers.
Tom Danley, besides being an accomplished acoustician, is a successful entrepreneur as well. A patent is normally written by a lawyer in legalese, not easily understood by a layman. The trade secrets, not disclosed there, are the design features that make a product a success and hard to copy. Tom's marked generosity in sharing these details with the public, is remarkable. In this setting, patent expiration is not a particularly relevant issue. WHG
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Old 22nd September 2019, 05:10 PM   #9979
mwmkravchenko is offline mwmkravchenko  Canada
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Quote:
Originally Posted by whgeiger View Post
Tom Danley, besides being an accomplished acoustician, is a successful entrepreneur as well. A patent is normally written by a lawyer in legalese, not easily understood by a layman. The trade secrets, not disclosed there, are the design features that make a product a success and hard to copy. Tom's marked generosity in sharing these details with the public, is remarkable. In this setting, patent expiration is not a particularly relevant issue. WHG



Again I agree.


But the patent is a doozy. I have read many hundreds so understanding a patent is not new to me. Tom is a gifted designer and inventor. And I know of at least a few instances where Tom has been very helpful in making people understand what he is doing well enough to make some of his products in a similar fashion.



Being able to duplicate doesn't mean you have the same article. Nor does it really mean that you have a solid understanding on what design choices went into making the original work as it does.


In fact there are a few other multiple entry systems out there that have a similar if not same result in creating a unified point for the reproduction of sound. Two of them are well published on this website and one for sure was helped out my Tom himself. The other was a completely original design.
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Old 23rd September 2019, 01:49 PM   #9980
1hiep0 is offline 1hiep0  United States
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Default confuse

Quote:
Originally Posted by mwmkravchenko View Post
Again I agree.

Being able to duplicate doesn't mean you have the same article. Nor does it really mean that you have a solid understanding on what design choices went into making the original work as it does.
Understood. So if I copy one of Tom's design 1:1 it will never sound the same as the original.

Quote:
Two of them are well published on this website and one for sure was helped out my Tom himself. The other was a completely original design.
I read one of thread. But he was stating that none of the commercial available matching his {or the same as his} if I interpreted correctly.

Unity VS Synergy What is the {main difference} technically between them? I prefer Unity horn built, which doesn't violate Tom's patent. Now I am thinking they are the same if they looked the same as Tom's commercial then I may be violated.
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