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It's June!  For those of us here at Danley Sound Labs, that means InfoComm!  We hope to see many of you in Orlando this month.  Take a minute and browse this month's newsletter where you'll find some information we hope will be helpful as well as entertaining.
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Come see us at InfoComm17!
We’ve been hard at work all year creating innovative products that will provide incredible listening experiences and we can’t wait to share them with you! Come experience the highly anticipated SM80F as well as Danley’s new patented “Paraline High Density (PHD)” technology featured in the newest member of the Jericho family, the J6-42.  You can also check out a brand-new version of Direct in Direct 2.0.  Be sure to use the VIP code DAN895 or click the link below to receive a free exhibit hall pass to ensure that you can be one of the first to experience these innovative products!
Come to InfoComm and Learn from the best!
 
Danley Sound Labs is very proud to provide two interesting seminars as a part of the educational program at InfoComm '17.

Both will happen on Tuesday afternoon, June 13. 

At 1:00 p.m., Doug Jones, and Tom Danley will present, "Subjective Evaluation of Loudspeakers:  What Can You Learn from Listening?"  This is seminar number IS112. 

At 3:00 p.m., Doug Jones will present, "Point Source Speakers in a Line Array World."  This is number IS113.  We hope you will take advantage of these opportunities to hear from a couple of the industry's great thinkers
Danley Provides Design Help for Athletic Facilities
With the advent of Danley's OS product line and GO2-8CX, many more athletic facilities around the country have installed new audio systems featuring Danley.  The new lines make a Danley system an incredibly affordable option while maintaining the legendary fidelity for which Danley is famous for.  High schools, colleges, and even professional teams are embracing the Danley difference.  In order to continue to grow this segment of the market and make it simpler for authorized Danley dealers and their customers, we have created the Danley Athletic Facility Design Guide.  Do you need a system for a basketball court?  See page 3.  There you will find 4 options using everything from OS100's to SH96's.  How about a football field?  A hockey arena?  A fitness club?  They are all here and each with multiple speaker options and coverage maps.  If you are interested in obtaining this new sales/design tool, give us a call here at Danley.  877.419.5805.  Or email us at info@danleysoundlabs.com.
Danley Core Values: Team
Another of the core values at Danley Sound Labs is "Team."  There are different types of teams:  football and basketball for instance.  On those teams, each person is playing the same game.  But what about a track and field team?  Team members are involved in different events, but they are still one team with one goal:  winning!

Which best describes the Danley team?  We think it’s the track team.   Here at Danley, we have team members involved in engineering, sales, customer service, shipping, sales reps, crossovers, international distributors, dealers and so on.  Each of us may not know the details of another person's "event", but we know that it’s critical to the goal: winning.  Here at Danley, we define winning as achieving our mission statement:  To find favor and a good name in the sight of God and man through innovative loudspeaker solutions. 
 
Harry Truman once said, "It is amazing what you can accomplish if you do not care who gets the credit.”

When each of us sees ourselves as members of the same team, regardless of our particular role, and when each of us is eager to sacrifice personal interest or glory for the welfare of all, then we will see what a team can really do! 
DNA Amplifiers - External Breaker Protection
5/25/2017
By Josh Millward
 
Over the course of the last several months, many features of the System Engineer Software and the DNA series products have been discussed, though it could have been called PodWare at the time. Fortunately, those features all still work the same, regardless of the name change of the software. 
 
This month External Breaker Protection (EBP) is the topic. EBP allows you to adjust how much current the amplifier draws from the power source.
 
The amplifier can be operated on either 240V or 120V AC power systems. In each of these situations, the current draw requirements are different. Since the amplifier comes with a NEMA L6-20P on the line cord, it is reasonable to assume that when used with 240V systems, a 20A supply will be adequate. However, when the amplifier is connected to a 120V supply, it is then capable of drawing up to 30A under a very demanding input signal and heavy loads on the output. 
 
This possibility of drawing up to 30A of current can make short work of a 20A breaker. Of course, when the breaker trips, the audio stops. It is seldom a good thing for the audio to stop when it should be continuing! 
 
This is where the EBP comes to the rescue. It can be set to a 20A setting. This tells the amplifier that it is connected to a 20A breaker so the amplifier modulates the draw on the line cord to keep from tripping a 20A breaker. This does limit the output of the amplifier a touch under very high demand situations, but generally speaking, this kind of adjustment would go completely unnoticed. After all, it only kicks in when the amp needs to draw more than 20A, which is only under extreme situations. 
 
It is worth noting that the available settings for the EBP control are to a minimum of 9A and to a maximum of 50A. Also, there is a meter next to the EBP control that informs the user as to how much current the amplifier is currently using. This can be a handy thing to observe. 
 
The External Breaker Protection control is located on the setup page of each DNA 10K4 Pro and each DNA 20K4 Pro amplifier panel in the software. It is to the left side of the panel, about mid-way down. Also, on the utility page (the page with the gear icon on it) there is a chart showing how much current the amplifier is drawing over time from the power supply. This can be very handy in situations where the amplifier’s power draw needs to be monitored versus time. 
 
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/
FIR Filters

Professor Doug Jones

Last month we presented the vocabulary of filters as a way to prepare for this month’s installment.  What do filters do?  Well, they can alter the frequency response of a device or a system.  We promised to address the issue of FIR filters but wanted to give you some background first.  So here we go..

FIR stands for Finite Impulse Response.  The more conventional filters are known as IIR filters or Infinite Impulse Response.  Let's not worry about the names at the moment as a full grasp of what that all means is not what we are trying to accomplish in this newsletter.

 If you recall, a few articles ago I showed that in the analog world, frequency and phase were tied together and there was no easy way to change one without changing the other.  One of the things that people like about FIR filters is the ability to make changes to the frequency response, without changing the phase response.  Keep in mind that the FIR does add overall delay to the system in order to accomplish this. 

FIR filters are certainly possible in the analog world but generally not used as they are expensive to build and generally not cost effective.  Building digital FIR filters, however, is not all that difficult.  Digital FIR filters open up options that are not possible with conventional filters, especially having control over frequency and phase separately.  There are situations where this can be very useful especially in adjusting the response of a single loudspeaker. 

The problem is that many view the FIR filter as a sort of superhero of modern audio, capable of just about any feat!  Superheroes are fun to fantasize about and are great escapist entertainment, but when your sound system is crashing down around you don't expect SUPER-FIR to come and save the day!   It just a filter.

We get a lot of calls at Danley about FIR filters and why we don't use them more then we do.  Let me state for the record that we are not anti- FIR.  We believe that FIR trees make excellent Christmas ornamentation.  Sorry, I couldn't resist…..  Seriously we are not against using FIR filters to correct issues in loudspeakers.  What we have learned is that one must be very careful to correct that which is truly broken.  The old maxim “if it ain't broke don't fix it” really applies here!  Poorly applied FIR filters can ruin a perfectly good loudspeaker. To be fair, so can any poorly applied filter.  It’s just that the FIR is so very powerful it seems that the chance for misuse is greater. 

Some advocate using FIRs to fix things that are not audible in the first place.  If a speaker shows 600 degrees of phase shift at 18 kHz, can that be fixed with a FIR filter?  Yep.  Should it be?  Good question.  Assuming that the measurement is accurate that reveals the “error” at 18 KHz, consider this;  600 degrees at 18Khz is equivalent to moving the driver 1.1 inches!  Since there is no way to build a negative delay line,  (where the signal comes out before it goes in) we have to delay the whole speaker except the part that is producing 18 KHz, by 1.1 inches, to make the phase at 18KHz look better.  Will that be audible?  I sincerely doubt it.
 
FIR filters can't fix things like reflections or room acoustics.  The problem is that it often appears as though they can.  When sound leaves a loudspeaker and begins the journey through the air to eager ears, sometimes it bounces off of reflecting surfaces. When the reflected sound and the direct sound arrive at a listener, the direct sound is unavoidably changed by the reflected sound.  Some believe that a FIR can fix that by sort of pre-distorting the sound before it leaves the loudspeaker, so when it arrives at a listener the effect of the reflection is eliminated.  There are lots of problems with this idea, but the most obvious one is that even if it were possible to do, it could only work for one point in space… for one listener.  The next seat over would require a completely different solution.

FIR filters also cannot truly fix line arrays.  The line array community loves FIR filters.  I’m not sure why.  There are software solutions on the market which take a look at the responses of a line array, determine the best compromise solution, and then implement a myriad of FIR filters, manipulating frequency and phase to achieve the best compromise response over a seating area.  It is not really fixing the problem.  Again you can only fix the problem of multiple arrivals at one point in space.

FIR filters are not effective at fixing transient distortion problems, or any other issues which change dynamically.

FIR filters do not make setting up delay speakers any easier.  The vast majority of the time you don't want your delay speakers to be “phase matched” to the main speakers.  You want to delay them by tens of milliseconds relative to the main speakers to get the precedence effect working for you.

I mentioned earlier that a side effect of FIR filters is the delay.  The good news is, I suppose, that the delay produced is not frequency dependent.  We call this delay latency. The longer the wavelength you are trying to modify, the more latency you will create.  So using FIR filters to modify low frequencies can be costly in terms of latency.  Latency can be a real issue in all digital systems.  Digital consoles have latency, they take time to do what they do.  Digital signal processors have latency.  Digital amplifiers have latency.  Latency adds up simply.  5 ms in one device plus 3 ms in another device and 10 ms in a third device yields 18 ms of delay.  In a live show how much delay can be tolerated in the PA?

Since it is always better to end on a positive note, FIR filters are a very useful and powerful tool.  When used properly they can make profound differences, especially in individual loudspeakers.  And, when individual loudspeakers work better,  systems – or multiple loudspeakers- work better. 

Well, that wraps it up for filters.  This is the last issue before Infocomm 2017.  If you plan to be there please stop by the Danley booth and say hi.
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