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Happy November from Danley Sound Labs.  As we approach Thanksgiving, Danley would like to say “Thanks” to you, our friends.  Your support has enabled our company to continue to grow and help folks around the world “Know Better Sound.”  We hope you enjoy this month’s newsletter.  Please feel free to contact us with any questions you may have.
SM100 BracketFeatured Product

Danley releases the new “BRKT-100 WALL bracket”, which provides an easy way to securely mount the SM-100CIN closely to any wall, allowing just enough room for wiring to the terminal strip on the back of the speaker. Please contact your local sales representative for pricing and availability.

Team Member of the Month

Chris Hutnick of Lienau AV, serving the Mid-Atlantic region, has been with Danley Sound Labs for several years now. Chris has developed an in-depth knowledge of the product line and how each product fits into the market. Part of this knowledge base has been developed by continually demonstrating the product line to not only dealers but end users too. This hands-on approach may have him demonstrating the OS80 at a high school facility one day, the SH50 for a performing arts center the next day, and most recently, arranging a large Jericho demo day at a concert venue.

Demos are an integral part of how Chris demonstrates the clear performance advantage the Danley products provide. Another of Chris’ valued assets is how he works with our integrators and consultants on design and bid documentation. It is one of the more detailed sides of the business that many manufacturer’s representatives do not take the time to get involved with, but it shows the level of dedication Chris brings to the table.
Danley Gives Back
Family Promise of Hall county is a non-profit organization with a unique approach to ministering to the homeless population.  Their mission is equipping a community to end the cycle of family homelessness. They provide case management, advisement, shelter, accountability, and advocacy to homeless  families seeking independence.
One of Family Promise' major fund raisers is the annual Promise to Run event.  Danley Sound Labs agreed to be a "Gold Level" sponsor of the event.  We encourage you to research ways you and your company can be involved in your community by giving back.
Saving Presets and Snapshots with PodWare 
Danley Sound Labs provides DSP presets for the DNA series products for all the current model loudspeakers. For the DNA SC48, DNA 10K4 Pro, and DNA 20K4 Pro these presets are contained in a single package that can be loaded in the amplifier. Each preset can be recalled on each output for a simple, yet highly customized solution. Next month we will discuss the preset stacks in more detail. The DNA 5K4c amplifier uses a series of individual presets for each pair of channels in the amplifier. There are a number of standard presets available, but customized loudspeaker combinations are also available. Again, more detail on that will be provided next month. 
Once a preset is loaded into an output channel, the prescribed DSP correction has been applied to the loudspeaker for a linear magnitude and phase response. This is great when in a perfect environment. Unfortunately, the simple fact of being inside a room means that typically the environment is far from perfect. On account of this imperfection, it is not unusual for the installer or system engineer to utilize something like Smaart, TEF, or some other measurement platform to identify corrections that should be made with the DSP. The input EQ can be utilized to implement equalization changes to the system as a whole to adjust the magnitude and phase response of the system to be optimized for the room it is in. 
After these EQ adjustments are entered into the DSP the processor or amplifier will remember them even though it is turned off and turned back on again later. However, it would be a good idea to save these settings in a preset so that if the controls are adjusted in the future, the settings can be restored to a known good configuration. 
Saving presets in the DNA SC48, DNA 10K4 Pro, and DNA 20K4 Pro is a fast and simple procedure. Please note, it is not possible to overwrite the factory presets. However, presets 1-10 are always available for user presets to be saved. There are other presets (presets 39-49) which are also available, but they may be used with future additions to the Master Preset Stack. 
Once the configuration is done and appropriate EQ has been applied, then click on the “Store” button below the Module Preset Recall combo box on the Setup page in PodWare. This will open a new window to save the preset. It will allow the selection of a Module Preset Location to save the new Module Preset, and allow naming of the preset, though only 12 characters are allowed. There are also labels that can be applied to the individual output channels. There are a variety of labels available so scroll through them to see what they are. This label will be appended to the end of name that shows up in the component recall combo box. 
Snapshots are essentially combinations of module presets. The snapshots will reconfigure the entire amplifier by recalling different groups of module presets. After configuring the presets according to the desired use case, a snapshot can be saved to store the complete current configuration so it can be returned to at a later date. The amplifier can then be reconfigured for a different use case, have different presets stored, and a new snapshot stored. It is then an easy situation to recall different snapshots to do completely different configurations with the amplifier. 
Snapshots can be recalled by selecting them in the PodWare software or by using the GPIO pins on the back of the amplifier. These pins can be configured to recall up to four different snapshots, though they are configured to recall two by default. 
The current version of PodWare is 6.24.04. This version is available for download from our website:
The current version of firmware for the DNA 10K4 Pro and DNA 20K4 Pro is 1.238.
The current version of firmware for the DNA SC48 is 1.364.
Loudspeaker Master Preset Stack version is 20161020
The firmware and loudspeaker presets are included in the PodWare download zip file for PodWare 6.24.04.
STIPA Workshop Available Through Danley Sound Labs
There is a change on the horizon that may have a significant impact on those of us in the audio world. Back in 1983, the Life Safety Code, called NFPA 10, was changed to require that there be voice alert systems to tell the occupants of a building that there is some sort of emergency and they need to get to safety. Recently, language was added to the Code that required that the voice be “intelligible”. Of course, this is open to interpretation. In the next edition of the Code, most experts expect that there will be a requirement that the intelligibility of the voice alert system be measured using a technique known as STIPA. We at Danley have prepared a workshop designed to bring you up to speed on intelligibility and STIPA. It has been accepted for INFOCOMM continuing education units. If you are interested in attending a workshop in your area, please contact us here at Danley. 
Tech Corner
Power ratings of speakers and amps part 2
By: Prof. Doug Jones

Last time we looked at power ratings. We contrasted a light bulb with a loudspeaker. A bulb’s rating indicates how much power it will dissipate under normal operating conditions. In a light bulb, that is easily defined. Normal means 120 volts, 60 Hz. But what is normal for a loudspeaker? That is not really even definable! What we want to know how much power a speaker will dissipate, in-other-words how loud it will get, before it fails. Last time we pointed out that the measurement of power is a measure of how much work is being done. Work is evident with a light bulb, it produces heat and light. But a loudspeaker doing ‘work’? Well, as Dick Heyser was fond of saying, “sound is what happens when air gets pushed”. Pushing air requires work. That energy has to come from somewhere. It comes from an amplifier, also rated in watts! Well, in a perfect world, one could simply choose an amplifier with a rating of 500 Watts for example, and pair it up with a loudspeaker rated at 500 Watts and all would be well. Unfortunately, it is just not that easy. As we saw last time, the load that is presented to the amplifier by the loudspeaker is constantly changing. Combine that with the fact that what destroys a loudspeaker generally has more to do with what signal was being sent to the speaker than the power rating of the amp or of the speaker, and the problem becomes very complex very quickly. Instead of trying to unravel all the complexity, I decided to try to give you another way to look at the relationship between amp and speaker.

Start by asking “how loud does it need to be at the listener that is the furthest from the loudspeaker?” (for the purposes of this article, I am equating the subjective term “loudness” with the objective measurement of Sound Pressure Level, of SPL). So here is a true story to illustrate. There is a small church with one of our SM96 loudspeakers installed. They kept blowing out drivers. After they replaced at least 4 drivers, I finally was able to pay them a visit. My first question was “ how loud do you mix?”

The tech replied, “around 95 dB SPL, that's not too loud is it?” .

Okay says I, now let's measure how far away the last row of seats is from the speaker. Turns out to be around 120 feet. Here is where it gets tricky. Take out your calculator, and follow me through this. For you purists, yes I know this is an approximation. Ok, speakers are generally rated at 1 meter. So, when you see on our spec sheet “continuous output 124 dB SPL” that means the speaker will do 124 at 1 meter. Okay 1 meter is 3.2 feet… Now, follow me on your calculator. 3.2 / 120 =.. ( answer should be .026) now hit the LOG key then =, ( answer should be -1.574…) Now type X 20 then =. Your answer should be -31.4. This is roughly how much sound pressure level is lost by the sound traveling 120 feet from the 3.2 foot reference distance! OK now let's look at the spec for the SM96. It says “continuous output 124 dB SPL” but at 120 feet it will be 31.4 dB down. So, to hit 95 dB at 120 feet, the speaker would have to put out over 95 + 31.4 or 126 dB SPL, and that is not taking any transients into account. No wonder the poor SM96 was blowing up! The formula, by the way, is dB loss = 20 Log (reference distance/measured distance). So here is the thing. First, figure out what SPL you want at the furthest distance. Then figure out how loud that will be at 1 meter. Choose a speaker that will deliver that with at least a 6 dB margin, 10 dB would be better. So, if you want to deliver 95 dB SPL to the back seat, 120 feet away, you should use a speaker rated closer to 134 continuous, or even more. Next time, our final installment on loudspeaker power ratings, we will discuss loudspeaker sensitivity and amplifier power.
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