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Merry Christmas from Danley Sound Labs!  We hope you are able to spend time this season with family and friends.  Before we get too far into the festivities, we hope you'll take a few minutes to read through this month's edition of the Danley Newsletter.  Check out Doug Jones' fascinating article on Michael Faraday.  Read about Danley at the stadium show in the UK. 

We want to make you aware of the fact that Danley's offices will be closed for the Christmas/New Year holiday from 5:00 p.m. December 21 until 8:00 a.m. January 2nd.  Merry Christmas and Happy New Year to all our loyal supporters!

International Stadium Show

Danley’s second year of participation at the International Stadium Show (this year held in London) was well received. Mike Hedden, company president, joined forces with other industry leaders on a panel to discuss the importance of audio, especially in large venues. It was quite evident that internationally, speech intelligibility has become an important factor in sound system requirements. JP Parker noted, “We were quite pleased to receive recognition from attending consultants and designers regarding Danley’s ability to achieve high STI levels, which makes us a strong contender in this market”.

Professor Doug Jones Lectures at Yale

Danley's own Professor Doug Jones was invited to present a lecture at Yale University in November.  The lecture, entitled, "The Role of the Loudspeaker in the Perception of Sound Space” was presented to a master's level class of sound design majors in the theater department. The lecture was a version of the class Doug and Tom Danley presented at InfoComm 2018, where through demonstration, it was shown that the choice of a loudspeaker can change the way that a stereo image is perceived.  Loudspeakers which exhibit freedom from frequency notches or “comb filters” will produce a much more accurate stereo image than systems where the drivers are not combining and “comb filters" are produced.
Those attending the lecture, both students as well as several faculty members, were very engaged.  The lecture was followed by a Q&A time that, unfortunately, had to be cut short so that the students could make it to their next class.  Danley wants to publicly express our thanks to Yale University and to those who helped set up the lecture.  We hope this kind of event can be duplicated in many other institutions of higher learning.

Michael Faraday
Professor Doug Jones
This month we are starting a new subset of this series; men whose names you may not know but probably should!  Michael Faraday is certainly one of the giants of science but unless you have studied electronics you probably won't come across his name.  Lets take a look at his life.   Faraday was born in a country village called Newington, in the county of Surrey, England on Sept. 22, 1791.  Michael was the third of four children born to James and Margaret Faraday.  James was a blacksmith but often could not work due to poor health.  Margaret came from a very poor family and was a servant before she married James. She was a woman of great wisdom who supported her children through a very difficult childhood. The family lived in significant poverty and often struggled to find enough food to feed the family.[1]  The Faraday family were devout members of a Christian sect known as the Sandemanians.  Michael frequently referred to his faith as a source of sustenance throughout his life[2].  Michael learned to read and write and do rudimentary arithmetic at a common day school.  At the age of 14, he was apprenticed out to a book binder to help support the family.  This proved to be a huge opportunity for young Faraday.  Unlike his fellow apprentices, Michael read many of the books that were brought in for re-binding.  According to an early biography of Faraday, there were three books that had a profound impact on Faraday’s early development.[3]  Possibly the most influential was Improvement of the Mind by Isaac Watts.  Isaac Watts is probably better known as a prolific Christian hymn writer whose work includes Joy to the World and over seven hundred more. But Isaac Watts was much more than a hymn writer.  He was a profound thinker in his own right and wrote a number of books, which over the years became foundational texts on critical thinking and scientific inquiry in prominent universities like Oxford, Yale and Harvard. Improvement of the Mind emphasized the importance of critical thinking and rational inquiry over simple acceptance of the prevailing dogma.  From the Farnam Street Blog, In part, Faraday credits his own “inventing the method of invention” to reading Watts’s books, particularly The Improvement of the Mind — a self improvement guide a few centuries before the internet. Watts recommended keeping a commonplace book to record facts, and Faraday did. Watts recommended he be guided by observed facts, and Faraday was. Watts recommended finding a great teacher, and Faraday started attending lectures.”[4]

 The second very important book was Conversations on Chemistry by Jane Marcet.  Marcet was a remarkable author of the 18th century who wrote a series of books she called “conversations” on different scientific disciplines, but aimed at the common man.  I suppose you could call Conversations on Chemistry an 18th century version of ‘Chemistry for Dummies’!   This 600-page tome truly captivated young Michael.  He started spending a portion of his salary on chemicals and equipment so he could duplicate the experiments he was reading about.  The third book, which profoundly influenced Faraday, was part of the third edition of the Encyclopedia Britannica. He found the article on electricity fascinating. So fascinating that he made a crude electrostatic generator using old bottles and scrap lumber.  Soon he was doing simple experiments with a voltaic pile, which he also built.[5]

In 1812 when Michael was 21, he had the opportunity to hear a series of lectures given at the Royal Institute of Science by the eminent chemist Sir Humphry Davy.  Faraday was convinced that he wanted to become a scientist, so he wrote a letter to the president of the Royal Society telling him of his dream to one day be a scientist.  Of course, he never heard back, but at the same time, he sent Sir Davy a 300-page book of handwritten notes he had taken during Davy’s lectures.  Davy was so impressed that when an opening became available he hired Faraday as a laboratory assistant in the Royal Institute!   Years later Sir Davy, a remarkable scientist in his own right, would say that Michael Faraday was his greatest discovery!   After a few months at the Royal Institute, Davy asked Faraday to accompany him on a tour of Europe that lasted 18 months.  During this tour, Faraday met some of the most influential scientists of his day, including Volta and Ampere.  This tour was like a university education for Michael.  Davy was so impressed with Faraday that he began acknowledging him in his academic papers.

Over the next 20 years or so, Faraday gained considerable recognition for his efforts.  In 1816 at age 24 he published his first academic paper in the Quarterly Journal of Science discussing his analysis of calcium hydroxide.  Five years later, he married Sarah Barnard and was promoted to the position of Superintendent of House and Laboratory of the Royal Institution.  In 1824, eleven years after he had written a letter to the Royal Institute stating that he wished to become a scientist, he was elected into the Royal Society.  Membership in this institution signified that Faraday had become a prominent scientist in his own right.   A year later, he became the Director of the Laboratory at the Royal Institution. Eight years later, he became the Fullerian Professor of Chemistry at the Royal Institution of Great Britain. [6]  Twice, in 1848 and in 1858, Faraday was offered the Presidency of the Royal Society but turned it down.  In his later years, Queen Victoria offered Faraday a Knighthood, but he turned that down as well, wishing to remain “ just plain Mr. Faraday”

Unlike some of the other men we have looked at in this series, Faraday is not remembered for just one outstanding discovery.  There simply would not be enough space in this article to list all of his accomplishments in both chemistry and electricity.   It might help put this into perspective to note that Albert Einstein kept photos of three scientists in his office; Sir Isaac Newton, James Maxwell and Michael Faraday.
Here is an abbreviated list of his discoveries;
  • 1821 Electromagnetic rotation.  This discovery led directly to the first practical electric motor.
  • 1823 Gas Liquefaction and Refrigeration.   Much earlier, John Dalton had theorized that either low temperatures and/or high pressures could liquefy gasses.  Faraday was the first to prove this theory to be correct by producing the first samples of liquid chlorine and liquid ammonia.  He was the first to show that ammonia could be liquefied by pressure then evaporated causing cooling.  Others had noted this phenomenon before, but Faraday showed that a mechanical pump could liquefy gas at room temperature, then evaporate the gas to cause cooling, re-capture the gas and compress it back to a liquid and repeat the cycle.
  • 1825 The discovery of Benzene.  This is one of the most important substances in chemistry
  • 1831 The discovery of Electromagnetic Induction. Faraday discovered that a magnetic field that changes can induce an electrical current in a wire. This discovery directly led to the development of the generator, which we still use today for producing most of the energy we use on a daily basis.  He confirmed the reciprocal property of magnetism and electricity.  You can create magnetic fields with electricity and you can create electricity with magnetic fields.  It is this principle that makes so many of the devices we use on a daily basis even possible, including loudspeakers and microphones.
  • 1834 Faraday’s Laws of Electrolysis.  Faraday was at the forefront of an emerging field called electrochemistry.  The laws that he discovered govern how electrodes behave and what happens when electrodes interact with ionic substances.
This is the science that eventually brought us the sophisticated batteries we use today.
  • 1836 The Faraday Cage.  Faraday discovered that when a conductor becomes charged, the charge exists on the outside of the conductor.  This means that a “cage” could be built to protect people from damaging electricity.  It also means that sensitive experiments could be isolated from external electrical charges.
  • 1845 Discovery of the Faraday Effect.  Faraday was the first one to find a link between electromagnetism and light.  It was this discovery that was fully described mathematically by James Maxwell almost twenty years later, establishing that light is an electromagnetic wave.
  • 1845 Discovery that Diamagnetism is a property of all Matter.  Faraday was not the first to observe diamagnetism, which means that a substance will be repelled by a magnetic force rather than being attracted to the magnetic field. He was the first to discover that it is actually a property of all matter not just certain substances. [7]
The above is not by any means an exhaustive listing! In 1831 he even did some rudimentary experiments with sound and Chladni patterns.  Toward the end of his life, Michael Faraday’s brilliant mind began to fail him and he had to give up conducting experiments.  He and his wife had no children, but there were a number of nieces who were a part of their lives.   Toward the end of his life, he wrote to his niece, Mrs. Deacon,
“I cannot think that death has to the Christian anything in it that should make it rare or other than a constant thought; out of the view of death comes the view of life beyond the grave…. My worldly faculties are slipping away day by day.  Happy for all of us that the true good lies not in them.  As they ebb, may they leave us as little children trusting in the father of mercies and accepting his unspeakable gift.”[8]

Michael Faraday died peacefully on the 25th of August 1867. He was buried at Highgate Cemetery in London in complete silence following the traditions of his church.
In 1881, the unit of electrical capacitance was named the ‘farad’ in honor of Michael Faraday.
[1] "Michael Faraday." Famous Scientists. 24 Nov. 2014. Web. 10/13/2018  <>.
[3] Munro, J .   Short Lives of the Great Electricians  1890 RTS London; p 188
[4]  Issac Watts and the Improvement of the mind.  Accessed 11/18
[5] Encyclopedia  accessed 11/15/18
[6] "Michael Faraday." Famous Scientists. 24 Nov. 2014. Web. 10/13/2018  <>.
[7] List adapted from Michael Faraday." Famous Scientists. 24 Nov. 2014. Web. 10/13/2018  <>.
[8] Munro, J .   Short Lives of the Great Electricians  1890 RTS London; p 218
DNA Pro Rear Support Brackets
By: Josh Millward
There is a unique accessory available for those who are using the DNA Pro series amplifiers in portable applications. There is a rear support bracket available for the DNA Pro series amplifiers to help carry the load when the amplifiers are in portable equipment racks that roll in and out of trucks all the time. It is called the DNA-RSK, or DNA Rear Support Kit. 
This rear support bracket consists of two rear ears that are attached to the amplifier with the included socket head cap screws. Then there are a couple of L shaped brackets which attach to the rear rack rails, and a plastic dowel which is attached to the L-shaped parts to engage the rear rack ear. This method of installation allows for quick removal of the amplifier from the rack if necessary. Please see the associated image to observe this mounting scheme in action. 
If the equipment rack has the “Z-rails” in the rear then the rack ears may be simply bolted into the Z-rail. This assumes, of course, that any space between the Z-rail and the rear rack ear is taken up by spacers of some sort so as not to deform either the rack ear or the rack rail.  
This gives two easy methods of installing rear support for the DNA Pro series amplifiers when used in portable equipment racks. This is important with portable systems because the front panels are subjected to a lot of stress when asked to hold up the whole amplifier while the rack is bouncing down the road in the back of a truck traveling from one destination to another. 
The current version of System Engineer is 7.01.25. This version is available for download from our website:
The current version of firmware for the DNA 3K8 Pro, DNA 10K8 Pro, DNA 10K4 Pro, and DNA 20K4 Pro amplifiers is 1.450.
The current version of firmware for the DNA SC48 is 1.462.
Loudspeaker Master Preset Stack version is 20181025
The firmware and loudspeaker presets are included in the System Engineer download zip file for System Engineer 7.01.25.
DNA product videos can be found on our website:
Danley Rental Gear: Got some? Need Some?

Got Danley gear that you would rent out to others?  Want people to know how to find you?  Go to the Danley rental page and fill out the rental submission form.  We'll add you to the map! 

Do you have a special gig coming up where you need a great Danley system but don't have all the gear you need?  It's possible that there is rental gear available in your area.  Check out the rental map on our website to find out where you can rent the Danley system of your dreams. 
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