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Welcome to Danley's September newsletter.  Come on in and check out the second installment of Dr. Doug Jones' column on "The Decibel."  You can also read up on another of Danley's core values.  Interested in the Nano, we've got that, too.  We are here to serve you.  Let us know how we can.
Danley Ramps up Production of the Nano
The Nano, Danley's smallest loudspeaker to date, made a huge impression at the InfoComm show in Orlando back in June.  Word quickly spread about this amazing product resulting in orders for Nanos coming in at a rapid pace.  To keep up with demand, Danley Sound Labs has acquired a new facility which allows us to significantly increase manufacturing capacity of all our molded products, including the hot selling Nano, along with our very popular OS and GO2 models.  Our ultimate goal is to have orders shipped the same day they are ordered.   We are proud to offer the amazing, US-built Nano at a price point competitive with the Pacific Rim imports but vastly superior sonically.  Get your hands and perhaps more importantly, ears on a Nano.  You'll quickly understand what all the fuss is about!
Danley Team Building Adventure
On Wednesday, August 23, Danley's Gainesville team took off an hour early to go down the street to the Gainesville Bowling Center for a little team building activity.  The level of proficiency in bowling varied widely among team members.  However, everyone seemed to be capable of keeping up in the realm of "smack talk!"  Mike Hedden, Chief Steward in Charge at Danley, took home the title of the top bowler.  The competition for low score was pretty intense.  We won't reveal the winner!  Overall, it was a great way to get out of the office with the team for a time of fun and fellowship!
Excellence: A Danley Core Value
It has been a couple of months since we talked about a Danley core value.  To refresh your memory, Danley's core values are Integrity, Service, Innovation, Team, Excellence, and Communication.

Today, we will focus on Excellence. The dictionary defines excellence as, "the quality of being outstanding or extremely good.  Better than average."  Here at Danley, we believe that the only way a company can be excellent is if individuals in the company work with excellence.  Each member of the Danley team is encouraged to be better today than they were yesterday.  Our mission statement motivates us: We desire to find favor and a good name in the sight of God and man through innovative loudspeaker solutions.  We are also motivated by this verse from the Bible:  "Whatever you do, work at it with all your heart, as working for the Lord, not for men." Colossians 3:23

In the end, excellence is cost effective.  The great UCLA coach, John Wooden, said, "If you don't have time to do it right, when will you have the time to do it over?"  Here at Danley, we value doing it right, from the beginning, every time.
Standby and Sleep Features
By Josh Millward

The DNA Pro series amplifiers feature two very handy features called “Standby” and “Sleep”. These two features can be used for various power saving and sequencing functions. These features are controlled from the System Engineer software and may be automatically employed through the use of a built-in timer, also controlled through the System Engineer Software. 
 
The “Standby” feature reduces the electrical demand and the thermal heat produced by the amplifier when it is not amplifying audio. Also, the front panel, while on, is not functional. If the front panel controls do nothing, but the amp is on, the amplifier is most likely in a Standby state. As soon as an audio input is present that is above -50dBu the amplifier will become active and fully operational in less than a quarter of a second. 
 
When in the Standby state, the amplifier is still fully functional on the network. It can be discovered and operated with the System Engineer software. Ultimately, the Standby mode is great for systems used for things like paging or announcements. These are systems that are always on but only used periodically or occasionally. The amplifier’s ability to be fully online in a nearly instantaneous manner ensures that the beginning of the message is not lost, but the system is still able to conserve power when paging and announcements are not being made. 
 
The “Sleep” feature puts the amplifier into a sleep state. For all intents and purposes, the amplifier appears to be off when observed in the equipment rack. However, the power switch will be in the “ON” position! Similar to the Standby feature, when the amplifier is in Sleep mode, it is operable from the network. The major difference is that when the amplifier is brought out of the Sleep condition, it takes about 25 seconds to be fully online (and just sending audio signal will not turn it on).
 
Sleep mode is a great method to use for sequencing the amplifiers on and off in an audio system with a centralized power control system. Using the Aux port on the back of the amplifier and selecting an Aux style on the amplifier that utilizes a Sleep function, a number of amplifiers can be sequenced to sleep and from sleep at the same time. Several amplifiers may have their aux port pin and ground pin wired in parallel. Then, when the aux port pin is shorted to the aux port ground pin, the amplifiers will all go to sleep. This function can be enabled by toggling the status of a single relay for a whole rack of amplifiers. This can greatly simplify the power sequencing needs of a system with the DNA Pro series amplifiers, especially when they are connected to 240V power systems. 
 
The current version of System Engineer is 7.00.15. This version is available for download from our website:
http://www.danleysoundlabs.com/dna-system-engineer/
The current version of firmware for the DNA 10K4 Pro and DNA 20K4 Pro amplifiers is 1.306.
The current version of firmware for the DNA SC48 is 1.394.
Loudspeaker Master Preset Stack version is 20170424
The firmware and loudspeaker presets are included in the System Engineer download zip file for System Engineer 7.00.15.
DNA product videos can be found on our website:
http://www.danleysoundlabs.com/danley-u/dna-amplifier-and-processor-training-videos/
 
The Decibel, Part II
Prof. Doug Jones
 
What happens if I don't care about power?  What if I am interested in voltage, which is much more common in audio these days?  Power is cheap.  We care about signal levels measured in volts.  Can the decibel be used to describe voltage ratios or even absolute levels?  You might be tempted to say no… and in a sense, you would be right.  Power does not equal voltage.  You can't simply change the rules and substitute volts for power.   But maybe there is a way…
 
To understand this next part, we will have to go into ohms law which describes the relationship between power in Watts and electro-motive force in Volts.  Ohms Law states that P (power in watts) = E ^2 /r.  So we could legitimately say that the decibel is 10 log E^2/r / E^2 /r.  Since voltage is most often measured in open circuit conditions the r can go away.  This conveniently reduces to   dB= 10 log E^2/ E^2 /E^2.  One of the rules of manipulating logs lets us move that square from the fraction to the other side of the equation. So, we can write 2 x 10 x log of E/E, by moving the exponent.   So, if we change the multiplier from 10 to 20 (2 times 10) we can now use the decibel to express a ratio of voltages, such as signal to noise.  And if we choose a reference for one of the variables, say 1 volt, we can define this as the dBV and use it for actual quantities.  In professional audio, the reference that is often preferred is .775 volts and the unit is the dBu.
 
We now come to the last part of our Tech corner; the use of the decibel to quantify sound.  And here is where the decibel really shines.  Acoustic power can certainly be expressed in dB and often is.   But what is generally more interesting to us and far easier to measure, is sound pressure. Our ears, in general, interpret an increase in sound pressure as an increase in loudness.  This is covered in another article called Domains.  Pressure is measured in Pascals.   An amazing fact about our ears is that the softest sound we can perceive corresponds to a pressure of 20 micro Pascals or .00002 Pascals.  The loudest sound we can tolerate before we experience pain is around 200 Pascals.  That is a range of 10 million to one!  Big numbers.  We need the decibel desperately! Pressure in Pascals is a field quantity, very much like voltage as it turns out, so if we use the 20 multiplier for the log of the ratio, we can use the dB to quantify changes in sound pressure level.  And if we assign a reference just as we saw earlier, we can use the decibel to describe an actual pressure level. If we use the threshold of hearing, .00002 Pascals, as a reference and call it the dB SPL, we now have a way to express actual sound pressures without having to use Pascals or deal with huge numbers.

So, let's recap.
The decibel always expresses a ratio between 2 numbers.  The dB without a suffix expresses the difference between two powers – or with a little math magic – the difference between two voltages or even sound pressure levels.  When we add suffixes to the dB: dBm, dbu, dBV, dB SPL, we are using the dB to indicate absolute values relative to some known reference.
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