USER MANUAL FOR DDT 2D Introduction Installation Getting Started
Contents
1. m Delay 0 000 a Gain dB Delay ms Angle Im 0000 000 lt io 4 you can see that DDT2D allows you to place 20 loudspeakers and create groups more on that later DDT 2d Manual Page 13 Danley Design Tool 2d Lets choose the SH100 from the pull down arrow on the right end of the box showing the SH60 Side view Because we are modeling in 2d the user has to decide between the side view or the Plan view For this example we are using the SH100 plan view Speakers Ne U Ame 2 Ulm e aJ Ulm e 4 Ulm e wm e JOm e Location Processing Model Sh 100 Plan vie v Sh 60 Plan view Jh 90 Side view Jh 90 Plan view Gh 60 Side view Gh 60 Plan view Sh 100 Side view Sh 100 Plan view Sh 95 Side view Selecting the box indicated by the arrow makes the chosen speaker active The M button Speakers Ne U Mim 2 2 Ulm e 3 Ulm 2 4 Ulm 2 5 Ulm 2 JOm e Location Processing Model Sh 100 Plan vie v Sh 60 Plan view Jh 90 Side view Jh 90 Plan view Gh 60 Side view Gh 60 Plan view Sh 100 Side view Sh 100 Plan view Sh 95 Side view next to it is a Mute button which leaves the speaker on the screen but mutes the output The phase button flips the polarity of the speaker Now select the Location tab This will let us place the loudspeaker on the Sound Field screen The first column in the X or horizontal position The next column is the Y or vertical position Remembe2. In the real world it will not M tetreteston Right reflection be this bad You will also notice that the Sound Field takes aie considerably longer to calculate Bottom reflection Bottom left corner D D T 2d 1 25 Danley Design Tool 0 000 p o Sound field Top right comer Frequency 100 Hz Band Widening 2 oct J SS 19 9 t C Show points of reflected sources C Show lines of reflected sources ee 11 7 Tano 25000 TE 12 8 29 2ft 45 6 62tt Frequency DDT 2d Manual Page 25 Danley Design Tool 2d Tutorial 2 A Cardioid Bass Array As a way to get familiar with the operation of DDT2D lets start by modeling a simple 3 box Cardioid bass array Select the Subs pop down menu You will see three tabs Location Processing and Model Select Model Lets use the sub labeled TH118 We will be using 3 subs in our model so make sure that subs 1 2 and 3 are all set to the TH118 sub Now select the Location tab Set the fields in the first 3 subs as shown below Subs Location Processing Model Groups Set Angle 12 34 4M 66007 FOGG a OOOO Humea 600 8500 1780 OOOO 3 Mim 6000 6800 0 2 OOOO bme 600007 90000 y OOOO sJUmM ooo F000 y OOOO This will place 3 TH118 subs in the Sound Field with the center one pointing backwards from 1 amp 3 Now pull down the Processing tab and set the delay of TH118 2 to 2 20 ms Turn off the crossover by de selecting t
3. pe a AF as ASDn JZ 20 3ft 59 7 ft 99 1ft 138 5tt 78 22 68 24 BRR RRRRRRRRRRRRRRRRRRRRR RR RRR 139 45 48 56 DDT 2d Manual Page 15 Danley Design Tool 2d Now lets take a look at the frequency response of our sound system To do this we need to place at least one microphone in the Sound Field Select the Microphones tab Microphones CO i 0 00 c ime 0 00 O Mie3 0 00 o 0 00 o mes 0 00 o 0 00 o ie 0 00 ai ROO o 0 00 Cl mm 0 00 0 00 0 00 0 00 0 00 0 00 0 00 0 00 0 00 0 00 0 00 a Set frequency response division Set frequency response floor lt gt lt gt 4 gt 4 gt lt gt DDT 2d allows the user to place up to 10 microphones in the Sound Field window Lets place a microphone about 45 feet from the speakers slightly off center Enter the numbers 65 00 17 00 in the two columns When you click the square box to the left of Mic1 to activate the mic you will see a red response curve appear immediately in the Frequency Response window Frequency response 116 110 104 96 92 o6 J9 Frequency Mic 105 43 Mic 2 Mic 3 Las Mic 4 Mic P mics BE mic 3 970 Hz Mic 6 156 631 205 10099 DDT 2d Manual Page 16 A JANIE Danley Design Tool 2d This is the frequency response of the system at that point in space There is clearly allot of comb filtering due to the arrival
4. the terms horizontal and vertical refer to the axis of the graph and not the orientation of the speaker For example when viewing a speaker in the plan view the Y axis represents typically the width of the room When viewing the elevation or side view of a speaker the Y axis will represent the vertical dimension The final column is the rotation of the speaker In Plan Groups section Group 1 E ea E Gain dB Delay ms Angle m 0 000 000 0 DDT 2d Manual Page 6 Danley Design Tool 2d view using the angle control will rotate the speaker about its vertical axis with a negative angle turning the speaker clockwise When using a side or elevation view the angle control tilts the speaker up or down with a negative angle pointing it downwards Groups An individual loudspeaker can be assigned to 1 or all of 4 groups All loudspeakers assigned to a group can be controlled as a group by using the controls in the Groups section at the bottom of the Speakers window The group can be muted the polarity of the entire group flipped the gain can be changed delay added and the angle of the speakers in the group adjusted Using the 4 boxes next to the group select the group can me moved anywhere on the screen The Master section to the left of the Groups section adjusts the gain and delay of all loudspeakers Processing Selecting the Processing tab brings up a new window where the gain and delay of a speaker can
5. Field window As you move the curser around you will see the numbers in the left set of position boxes will change Sound field Frequency Hz 1000 Band widening 1 12 oct 27t 6 20 Let a X Position 20 N 52 8ft 85 6ft 20 01 1772 Y Position Click at a location close to 20 18 Now pull down the Speakers tab Click on the set button next to speaker 1 Speakers Location Processing Model Set C Mim E Sh 100 Plan view J 2 Mim 2 Sh 100 Plan view You will notice that speaker 1 will jump to this location You can use this point and click technique to quickly place speakers or microphones anywhere in the Sound Field window You can also edit the location using the xand y fields under the location tab DDT 2d Manual Page 18 A JANIE Danley Design Tool 2d Ok using what ever technique you wish lets get the two speakers to 20 00 18 00 and 20 00 19 00 This will place the speakers side by side Click on generate The response is much better in the middle but now there huge notches in the response on mic 2 and 3 You can save this design to memory 2 If you select the tab Memory from the Variables Window you will see the graphics from the first design Clicking on the number tabs allows you to compare the results of the two designs D D T 2d 1 25 Danley Design Tool Sound field Frequency Hz 1000 Band widening 1 12 oct Generate Speakers a
6. times from the two speakers To confirm this you could simply mute one of the speakers You will see the response immediately flatten out To Mute a speaker pull down the Speaker tab and click on m the next to the speaker you wish to Mute You should also notice that the response starts rolling off at around 150 Hz Note When you move your mouse over the Frequency Response window the cursor becomes a cross and the frequency at the cursor is displayed in the grey box labeled frequency at the bottom left of the display The amplitude or level of each micis displayed in the colored box associated with each curve In the example shown above the level at Mic 1 is 105 dB SPL at 970 Hz Go to the Options tab and you will see that there is a crossover set at 150 Hz If you lower the crossover to its lowest setting of 70 Hz you will see the frequency response curve update automatically Now lets place a few more mics just for fun You can enter x y coordinates as we did before but there is a faster way Move the mouse to a location in the Sound Field window where you would like to place a mic say in front of speaker number 2 Click on that location then click on the green box Mic2 Mic 2 will appear in front of speaker 2 and a new green curve appear in the Frequency Response window This is the response pretty much right in front of speaker 2 If you wish you can also look a the response in front of speaker 1 as well or the respons
7. A VANE Danley Design Tool 2d USER MANUAL FOR DDT 2D VERSION 1 8 Welcome to the Danley Design Tool 2D program Introduction DDT2D is a very powerful tool that lets the user visualize how sound propagates from loudspeakers including subwoofers and interacts with sound from other speakers and with the room Working in 2D lets the user see phenomena with great detail which when presented in 3D may be hard to see due to the increased amount of data presented Sometimes 2D is a better way to view things For example the effect of placing subwoofers on each side of a stage at 100 Hz shown below is very clear in 2D Pt 26 4 149 BoT 100 ae Rif 31 1ft Adif Tift Installation DDT2D comes as a Self installing program Simply click on the icon and it will install The program requires less than 20 mb of hard drive space Getting Started When you first launch the program you will notice that there are 3 parts to the display On the left at the top of the screen there is the Sound Field window This is where the 2D coverage maps are displayed You can choose the frequency and the resolution of the display See the section on the Sound Field window for more information Below the Sound Field window is the Frequency Response window where the frequency response of the system is displayed The Frequency Response window becomes active when one or more microphones are placed in the sound field The response of up to 10 microphone
8. ab Processing described above Crossover The Crossover tab is identical in function to the Speaker tab Crossovers described above Model The Model tab is identical in function to the Speakers Tab Model described above DDT2D version 1 48 includes 3 of the Danley subwoofers the TH812 the DBH 218LC and the TH118 In addition we have included an idealized true omni subwoofer DDT 2d Manual Page 8 A VANE Danley Design Tool 2d Mics Tab Speakers Subs Mics Draw External image Memory Options Project Reflections Connect Movie Microphones _ Location Spl y y Set frequency response division C im 0 00 0 00 m o 0 00 0 00 a Set frequency response floor O Mmea 000 0 00 3 o ie 0 00 0 00 4 o ies 0 00 a 0 00 4 oO 0 00 0 00 F c a 0 00 a 0 00 4 OC a 0 00 0 00 s Oo 0 00 0 00 3 E 0 00 0 00 4 C Circle of mics at point x y z x Rotation Radius 10 0 0 0 30 0 0 a Set from v DDT2D allows for up to 10 microphones to be placed in the Sound Field window The Microphone tab window is shown above The small square button turns the microphone on or off The colored box with the mic number inside is similar in operation to the set button in the Speaker Tab Clicking on a location in the Sound Field then clicking the colored box will place a mic in the location selected The next two columns are the location columns The first column selects the X or horizonta
9. be adjusted The set on off mute and polarity functions remain active Crossover The crossover tab can be used to set the high pass crossover for the loudspeaker The check box turns the crossover on and off There are two ways that a crossover can be set for a loudspeaker The Global crossover is adjusted under the Options tab Use the Global crossover if all the crossovers in the system are likely to be identical The settings of the Global crossover are shown greyed out if the Global crossover is chosen The crossover can also be set to Local The Local crossover affects only the selected loudspeaker Selecting the Local option activates the Frequency Type and slope windows The frequency can be set to any value from 20 to 9999 Hz DDT 2D supports 3 types of filters Bessel Butterworth and Linkwitz Riley in 4 slopes 6 12 18 and 24 dB per octave Model When the Model tab is selected a new window is displayed where the user can Select from among the Danley Sound Labs family of full range i e not subwoofers loudspeakers Each loudspeaker is listed in both plan view or side view The set on off mute and polarity functions remain active DDT 2d Manual Page 7 Danley Design Tool 2d Subs Tab Location The Subs tab Location is identical in function to the Speakers Tab described above The user may place up to 20 subwoofers in the Sound Field window Processing The processing tab is identical in function to the Speakers t
10. c 3 aa Mic 4 Mic 5 i 3473 Hz Mic6 Mic 7 D mics B Mic o Mic 10 M Smoothing DDT 2d Manual Page 5 Danley Design Tool 2d The Parameters Window Speakers Tab Speakers Subs Microphones Draw Cale Memory Options Project Key commands Reflections Speakers Location Processing Crossover Model Set s Y Anke Groups q lees od C Mim 2 26 57 8 3510 o OOO0 Location Selecting the Speakers tab will display 4 sub menus or tabs with the Location tab showing DDT2D allows the placement of up to 20 full range speakers in the Sound Field window Using the mouse click on a location in the Sound Field window Click the set button to place a speaker in the position selected the small square to the right of the Set button makes the speaker active when checked When checked the speaker will be displayed in the Sound Field When de selected unchecked the location will remain but the speaker will be invisible Mute button leaves the speaker visible but mutes the output Phase button reverses the polarity of the loudspeaker when selected The button will turn red when selected The ID button when clicked will turn the corresponding loudspeaker red for easy identification the next three columns allow for manual placement and orientation of the speakers The first column selects the X or horizontal position and the next column selects the Y or vertical position on the Sound Field Note the use of
11. can grab it with the mouse and move the panel anywhere on the screen this way you can customize the look of your screen and keep active tools that you use frequently To return all panels to the default position click the default panel location button We The menu bar may be torn off in its entirety When it is you will have to double click on a tab to open it DDT 2d Manual Page 2 Danley Design Tool 2d The Top Level Buttons mee eae er Moving the mouse over the buttons on the top left of the screen will display a roll over description of the function of the button From left to right these are Create a New Project start with a clean slate Open an Existing Project opens the Windows Browse window Save a Project opens the Naming window and allows the user to save a project Draw Line allows user to draw a line freehand in the Sound Field window Erase Line click erase line then mouse over the line you wish to remove Erase All Lines removes all lines from Sound Field Measuring Tool measures distances in Sound Field window Distance in feet or meters and time in ms are displayed directly above the sound field window Activate Scroll Bars if the display is too small to show the entire DDT2D display you can activate the Windows scroll bars Maximize Minimize Sound Field Window clicking this button will enlarge the Sound Field window to occupy most of the screen Clicking again will return
12. ct button is under the Processing tab Reviewing our Danley Sound Labs Spec sheet we see that the SH50is rated down to 50 Hz and the TH118 is rated up to 225 Hz This means we could select a crossover frequency somewhere between 80Hz and 225 Hz This is one of the strengths of using DDT2D to evaluate a sound system You can try different crossover frequencies different slopes and different alignments to find the best possible set of parameters Lets start with a crossover set to 100Hz Remember the crossover point is set under the Options tab DDT 2d Manual Page 22 A JANIE Danley Design Tool 2d D D T 2d 1 25 Danley Design Tool sound field Frequency 100 Hz Band Widening 2 oct 15 2ft 38 2tt 61 2ft o4 1Tt Frequency response i a es ee ee ee 120 114 108 102 96 Frequency Choosing the frequency of 100 Hz and setting the Band Widening to 2 octaves will let you see how the SH 50s and the TH118 interact You can see from the Sound Field that there is considerable interference between the two It can also be seen in the frequency response Adjusting the gain delay and crossover characteristics can improve this system significantly However it is unlikely that you will find a combination of settings where the response at the 2 microphones will be the same Lets look what happens if you move the sub up to the ceiling with the SH5Os Moving the Sub to the coordinates of 6 00 20 30 with a 20 angle not really
13. d in 3 octave steps and then display the coverage as a movie DDT 2d Manual Page 12 A JANIE Danley Design Tool 2d TUTORIAL 1 A simple sound system Please note some of the illustrations in this tutorial are from an earlier version of DDT 2D As a way to get familiar with the various parts of DDT2D lets design and model a simple 2 way sound system Lets start with a PLAN view of the system The PLAN view is looking down from above With DDT2D you don t need to build a room unless you want to You can examine the way speakers couple for instance without building a room first So lets look at a few options before we put them in a room Suppose we are trying to decide if a pair of loudspeakers would be best placed together in the center of the room or one on each side of the stage Lets assume the the stage is 18 feet wide Lets first place a loudspeaker on stage right Click on the Speakers tab on the right hand Variables Window Now select the Model tab Speakers Subs Line array Microphones Draw Cale Memory Options Project Key commands Reflections Speakers Location Processing Model Ne Vime Sh 60 Side view v Ome Sh 60 Side view v Om 2 Sh 60 Side view v GOME Sh 60 Side view v 5 Ome Sh 60 Side view v e JOme Sh 60 Side view v Lm Sh 60 Side view v Om 2 Sh 60 Side view v 3 Ome Sh 60 Side view v io Om E Sh 60 Side view v Master section Groups section Gain dB D Increment m 0 000 E Grupo 1
14. e anywhere you wish Here I have placed a third mic in front of speaker 1 slightly closer to the speaker D D T 2d 1 25 Danley Design Tool pen goga Sound field Frequency Hz Band widening 1 6 oct Speakers Subs Microphones Draw Speakers 427f Location Processi Set 26 2 r 1 Mm 2 Sh 100 Plan 3 Mim Sh 100 Plan gst h Om Sh 60 Side v COME sh 60 Side v 5 Ulm sh 60 Side v JOm E Sh 60 Side v 7 Ulm 2 Sh 60 Side v JOme Sh 60 Side v 3 Om E sh 60 Side v io ml e Sh 60 Side v 20f 52 8ft 85 6 t 118 4ft 41 81 427 a ee 8 53 Frequency response Master section Gain dB m 0000 Gror DDT 2d Manual Page 17 A VANE Danley Design Tool 2d You may recall that when we started this exercise we set out to see if speakers on each side of the stage is better then a pair placed in the middle over head Lets save this design in memory so that is will be easy to compare it to our next design Click the 1 button at the top of the window This will save this design the coverage map and the frequency response screen to the first of 3 available memories D D T 2d 1 25 Danley Design Tool HEE adi Ls JL JL Now lets try to modify our design to see what would happen if we were to put the two speakers together hung over the stage Pull down the Speakers tab and lets learn a different way to move or place a speaker Move the mouse to the Sound
15. e on the floor Now use the tool at the bottom of the Speakers window labeled Group Section Make sure that Group 1 is selected and enter 20 in the angle box Both of the SH50s will now point 20 degrees down Re generate the coverage and you will see that the speakers now point at the floor DDT 2d Manual Page 21 A JANIE Danley Design Tool 2d Lets add a few mics to check the response Place one mic towards the back of the room and one about half way down You should see that the response looks virtually the same in both positions the nearer one being somewhat louder Your model should look something like this Sound field Frequency Hz 1000 amp Band widening 1 12 oct v 61t N eit 43 9ft 70 2ft 96 4ft zi 122 41 29 95 MRANNRANNRANURNNNRANRRNNRNNN 7263779 4 101049 Frequency response eS tt A a es 126 120 114 ages pe E GS eee i m a zz 40 160 640 2560 10240 Frequency Mic 113 97 Mic 2 117 85 Mic 3 Rs Mic 4 Mic 5 ay 597 Hz Mic 6 Mic 7 SI mics HE mic 9 Mic 10 Now finally we can add our subwoofer and experiment with location Lets start with the Sub on the floor Lets choose the TH118 and place it under the SH50s on the floor Because of the size of the TH118 the Y axis will need to be about 1 4 ft to Show it sitting on the floor Make sure that the crossover buttons are selected default condition on both the SH50s and the TH118 The crossover sele
16. hapes circles and text boxes can be placed on the Sound Field window CALC Tab The CALC Tab was discontinued in version 1 7 The calculator functions are available as apps for iPhone iPad from the Apple Store External Image DDT 2d starting at version 1 8 allows you to import an image and setitaa background in the sound field window This is particularly useful for importing images of sports facilities from google earth Clicking on the box import external image calls up the Windows file browser window Images to import must be png files Click Show image to turn on the image in the sound field Opacity sets the level of transparency for the import images To use the scale feature you must know the true size of some object in the image For example if the image is of a football field you can use the width of 160 feet as areference Use the measure tool in menu bar above the sound field and click and drag across the element to be measured The measured dimension will appear in the last measured distance window Then enter the desired dimension in the real Distance should be window Click on calculate scale and apply to image The image will rescale Fora demo on importing and scaling an image see the video readme file for DDT 1 80 http www voutube com watch feature player detailpage amp v RD4Q1gZEC7I Speakers Subs Mics Draw Externalimage Mer External image Import external image Show
17. he angle per step Key Commands The key command is simply a listing of the key stroke equivalents or key board shortcuts DDT 2d Manual Page 11 A JANIE Danley Design Tool 2d Project Tab The project tab has the tools for saving and opening DDT2D projects and adding notations to projects Reflections Tab Reflective surfaces can be created in DDT2D using the tool under the Reflections tab In the current 1 48 release the user is limited to rectangular rooms Frequencies below 3kHz can be mapped and the result of the reflections shown in both windows The user can make each of the surfaces active or inactive to study the effect of reflecting surfaces on the response and coverage The rectangle is formed by entering the coordinates of the lower left and upper right corner Connect Tab Speakers Subs Mics Draw External image Memory Options Project Reflections Connect Movie The connect tab has two sub tabs The News page will display news about Danley events or updates to DDT The DDT Help forum is a DANE place here DDT users can interact News page DDT Help Forum with each other and with the DDT INFO moderators to get help or usage tips Movie Tab Speakers Subs Mics Draw Extemalimage Memory Options Project Reflections Connect Movie Coverage movie The movie feature allows i you to capture the Time between frames 4 v Check frequency 1000 v coverage from the speaker s in the sound fiel
18. he crossover box Flip the polarity of the center TH118 In the Sound Field set the frequency to 80 Hz with the Band Widening to 1 octave Generate a Sound Field NOTE The screen will likely be totally black if you generate a Sound Field with out flipping the polarity of the center sub You have essentially gone off the top of the amplitude scale Reduce the drive level to all 3 subs and the Sound Field will map normally Aconvenient way to optimize your Cardioid array is to use the microphones Select the Microphones Tab Here is a good time to try the circle of mics available in version 1 48 and higher Place a circle of mics around the middle sub and you will see the response appear in the freq response window Select the smoothing feature and you will clearly see the directional response of this array DDT 2d Manual Page 26 A JANIE Danley Design Tool 2d ee gog Sound field Frequency Hz Band widening 1 oct i Generate 16 6ft iT F wi E a 14 8f 31 2ft 7 38 UUN 16 24 Frequency response Ce C a 39 158 631 2525 10099 Frequency Mic Ma Mic 2 BRIAN Mic 3 9215 Mic4 85 07 3 Mic5 96 32 833 Hz Mic6 94 9 Mic7 9084 mics GRR hic o Mic 10 V Smoothina Your cardioid array should look something like this Have fun experimenting DDT 2d Manual Page 27
19. image Opacity 50 v Scale 1 000 3 Y Location 0 000 a 0 000 F Erase image from project Scale calculator Last measured distance Real distance shouldbe 0 O00 F Calculate scale DDT 2d Manual Page 10 A JANIE Danley Design Tool 2d Memory Tab There are 3 memories which can store and retrieve coverage and response curves for easy comparison D D T 2d 1 48 Danley Design Tool goga When you have a coverage map and a response you wish to save click one of the 3 numbered buttons shown above Then by selecting the Memory tab you will be able to compare the curves saved in memory Options Tab The options tab allows the user to set certain parameters for DDT2D The grids can be turned on and off and the user can select between imperial and metric units Coordinates increment allows the user to choose the change increment for most of the boxes which have up down arrows like the X Y coordinates selectors Air Attenuation By selecting this option and entering the temp and humidity DDT2D will accurately include the effect of air attenuation on the frequency response per ISO 9613 1 Crossovers DDT2D allows the user to build 2 way systems using a variety of crossover options The Global Crossover box is where the global crossover parameters are selected Polar Pattern Grid The polar Pattern Grid places a polar grid on the Sound Field The size and location of the polar grid are adjustable as is t
20. kers Subs Microphones Draw Cale Memory 40 1 Location Processing Model EA gt 228 Hume 2000 18 00 3 G ume 20 00 lt 119 00 3 Clim 2 0 00 a 0 00 Ome oo looo 35 6ft 61 8ft 88 1t 114 3 ial 5 Cim 0 00 0 00 53 44 51 12 CT 99 24 21 33 wma ooo looo Om 0 00 0 00 ime 00 sooo wma 000 000 Co O m 0 00 10100 Master section G Frequency response Gain dB m 0 000 4 Group 1 E C Delay AAAA a Gain dB Maybe the SH100 was not a good choice because although they couple well at low frequencies see the very close agreement from all 3 mics below 600 Hz the SH100 is not designed to be arrayable You can clearly see the cancellations in both the response and in the coverage Lets try a third design If you go to the Speakers tab you can simply click on Model and select different speakers Lets try a pair of SH50s plan view You will need to zoom in to see it but if you place the two SH50 at the 18 and 19 ft locations they will hit each other So lets put one at 18 and one at 19 80 ft Then because the SH50 is a 50 degree cabinet using the Angle adjustment tool set speaker 1 to an angle of 25 degrees and speaker 2 to an angle of 25 degrees Now the two can be moved together so that they are tight packed You should end up with the two speakers at 20 18 9 and 20 19 8 or some set of coordinates where the speakers are 9ft apart Notice the impr
21. l position and the next column selects the Y or vertical position on the Sound Field Note the use of the terms horizontal and vertical refer to the axis of the graph and not the orientation of the microphone The boxes on the right set the scale of the Frequency Response graph The user can select 3 6 Or 10 db per division and the bottom of the graph i e 0 on the y axis can be 80 90 or 100 dBSPL If the mouse has a scroll wheel place the mouse over the Frequency Response screen and click on the Y axis The curser will turn to an up down arrow and the user can select vertical resolutions other then the 3 6 and 10 dB Moving the curser to the center of the Frequency Response window and the curser will return to the default crosshair Moving the scroll wheel will now adjust the horizontal axis The circle of mics will place a circle of microphones anywhere on the screen You can locate the circle by using the X Coordinates or by using the set from drop down box DDT 2d Manual Page 9 Draw Tab Danley Design Tool 2d The Draw tab gives access to a number of drawing tools which let the user create complex rooms in the Sound Field window IMPORTANT The lines drawn with the tools under the Draw tab have no acoustic properties The sound goes right through them DDT2D allows for freehand drawing or drawing using the X Y coordinate method See Tutorial 1 for a detailed demonstration on how to draw with the X Y coordinate system Arbitrary s
22. necessary DDT 2d Manual Page 23 A JANIE Danley Design Tool 2d D D T 2d 1 25 Danley Design Tool Sound field Frequency 100 Hz Band Widening 2 oct 23 Of a 5 2ft 17 8ft 40 8f 63 7 ft Moving the Sub to the ceiling immediately makes the response at the two mics virtually identical except for the level loss due to the difference in distance between the mics and speaker cluster Again feel free to experiment with different settings of the crossover levels and delay You may be able to improve on this design Here is my best effort D D T 2d 1 25 Danley Design Tool Sound field Frequency 100 Hz Band Widening 2 oct T i T o a B O E 2ft Frequency 303 Hz DDT 2d Manual Page 24 A VANE Danley Design Tool 2d Lets do one more thing Because our room is conveniently rectangular we can actually look at what effect the room will have on our design This is a worst case condition where each of the surfaces is assumed to be 100 reflective Select the Reflections tab If you enter the coordinates of the lower left corner 0 0 and the top right corner 75 25 you will create a rectangle of reflective surfaces which overlays the room we built earlier Of course you will notice immediately that our carefully tuned and tweaked sound system looks horrible This areas is what it would look like in a reverb chamber with everything totally reflective
23. oved coverage and the smooth response as the two speakers combine Save this design to memory 3 DDT 2d Manual Page 19 A JANIE Danley Design Tool 2d D D T 2d 1 25 Danley Design Tool er ee A Sound field ANLE 1000 Frequency Hz si ME 1 12 oct Generate Speakers Subs Microphones Draw Cale Memory Options Proje Speakers Location Processing Model Set Mme 20 00 Mme 20 00 Ome 0 00 Ome 0 00 s UmM s 0 00 Jime 0 00 Ome 0 00 Ome 0 00 GJUME 0 00 fo fm e 0 00 Master section Groups section Gain dB m0000 Grou 1 m D Angle 18 90 19 80 0 00 0 00 0 00 0 00 0 00 0 00 0 00 0 00 ho 1 ho N 28 1f 54 3ft 80 5ft A sft 9 42 9 22 COO 4511 19 98 Frequency response 4 gt 4 gt 4 gt 4 gt 4 gt 4 gt 4 gt 4 gt 4 gt 4 gt Oe aac eA A ee eS gt 4 gt 4 gt 4 gt 4 gt 4 gt 4 gt 4 gt 4 gt 4 gt lt 4 gt E S PIT ES T a a ce a Delay So now if you select the Memory tab from the variables window by choosing tab 1 2 or 3 you should be able to review your 3 designs Take this opportunity to Save your design by clicking on the disk icon save current project or by clicking on the Project tab You might consider naming this project my_first_model_plan or something to that effect to remind yourself that this is a plan view of your system Lets take our exploration one step further It is prett
24. positions can be displayed at once See the section on frequency response for more information DDT 2d Manual Page 1 A JANIE Danley Design Tool 2d D D T 2d 1 8 Danley Design Tool Lea gogn Zoom save o Load C Phase calculation ANLEY SOUNO LABS Sound field Speakers Subs Mics Draw Extemalimage Memory Options Project Reflections Connect Movie Frequency Hz 1000 s Band widening 1 oct v Speakers Location Processing Crossover Model 16 4 Set bd Y Ande Ta A GC OM 000 o0 Ere ooOo00 on 2 m 000 000 e Honoro C img 0 00 63000 Se Somm 16 4 J Om 000 gioco Blo Boooo w Om 000 3 000 pe s 0o000 65 6ft ae Ce JOM a 0 00 0 00 10 ml alaa 70 87 10 83 oime 000 o00 30 Sonrnrn0 requency response 2 Om 000 Woo So 6Cloooo 3 Om 0 00 0 00 10 malala mima 0 00 Woo ilo Bloooo Gi Om E 000 Wpro Ere s Oo000 G2 Om 0 00 0 00 alo S0000 G3 m 0 00 0 00 JA Joo000 Frequency Mic 1 Mic 2 M Mic3 Mic 4 Mic 5 a 14 Ciel fa ne O00 SR SAN d i z Mic 6 Mic 7 TS mice EEE Mic 9 Mic 10 M Ta iye C Smoothing Gain dB m 0 000 4 Group E Delay 0 000 z Gain dB Delay ms Angle x m 0 000 000 0 E DDT2D Screen On the right there are a number of drop down tabs allowing the user to design the system to model We call this part the Parameters Window Moving the Panels When you see this symbol you
25. r that this is a 2D model The words Horizontal and Vertical are relative Lets set the position of the first speaker at 20 00 10 00 Choose a second SH100 and place it at 20 00 28 00 You should see something like this Sound field Frequency Hz 40 2 25 4f 10 7t 1000 z Band wide DDT 2d Manual Page 14 Danley Design Tool 2d Note if you have a scroll wheel on your mouse you can zoom in and out of the Sound Field window Simply place cursor over the Sound Field window and the scroll wheel will become active Holding the Left button down while the cursor is in the Sound Field window will re position field of view but keep all of the actual locations the same Ifyou don t have a scroll wheel the I and O keys will also zoom in and out of the Sound Field window Now you can do your first simulation Press the space bar or click the generate key You will see the 1KHz coverage plot HEE agoa Sound field Frequency Hz 1000 amp Band widening 1 12 oct v 40 2 A ee o BA ae E LA SEE dl 120 44 6 53 MOODDUONODAANAODAUAOODANNANAN 3215 41 08 Experiment with different frequencies Click generate after selecting a new frequency to plot 1 12 of an octave is the highest frequency resolution possible but you can also choose to display the average of the full 10 octave response shown below HEE Ae eI Sound field Frequency Hz 1000 Band widening 10 oct v
26. rom x1 y2 to x2 y2 a horizontal line will appear in the Sound Field window This represents the floor of our room Next add a line from 0 00 0 00 to 0 00 25 00 This should draw the front wall The ceiling should be 0 00 25 00 to 75 00 25 00 and the back wall should be 75 00 25 00 to 75 00 0 00 When you are done the room should look like this ne hom ills ane Sound field Frequency Hz 1000 Band widening 1 12 oct v 30 1ff 15 3 06t Oft 29 5ft 59 1ft 88 6ft zi 76 18 5 64 T ee 4 1 Now we can place our speakers Choose the Speaker tab and select SH50 side view Lets place one 10 feet from the front wall and 2 ft down from the ceiling We could point at the desired position and click set but entering the coordinates is more precise The coordinates should be 5 00 23 00 Remember our design called for two SH50s side by side Lets add a second speaker at the same location Even though we cant see the second speaker from this perspective DDT 2d will accurately model the sound pressure level and frequency response of the combined speakers Notice in the Location tab under Speakers you can assign any speaker to one of 4 groups This is a convenient way to change the position or processing of an entire cluster of speakers Lest assign our two SH50s to group 1 If we click Generate we can see that we need to angle our speakers down to cover the audience which presumably will b
27. the Sound Field to default size Note while window is maximized it will cover up most of the pull down tabs You will need to double click a tab to open it Default Panel Location returns all panels to default locations see Moving Panels Memory records Sound Field and Frequency Response to one of 3 memories View using Memory tab Sound Pressure Level A C and F Weighting selecting these buttons with an active microphone will call up a small box attached to the microphone indicating the Sound pressure level at that point Current Units displays the current unit selection and toggles between feet and meters DDT 2d Manual Page 3 Danley Design Tool 2d Zoom save 1 2 Load Spec generator Phase calculation Zoom Save Just below the top level controls you will find the Zoom or view save and load controls Use these to save up to three particular views or screen zooms then return to them by selecting load Spec Generator Clicking Spec Generator opens a new window which will eventually hold complete specs of the loudspeakers As of version 1 7 spec generator will generate a coverage contour graph shown below Directivity Contours Model v Return to DDT Cursor frequency 9576 Hz 6dB per color Phase Calculation DDT2d now defaults to showing power summation in the sound field Turn Power sum off by E Phase calculation For more information about power summation please see And h
28. ttp www voutube com watch feature player detailpage amp v sR7kctrfcnE This is a two part tutorial on the use of power summation DDT 2d Manual Page 4 Danley Design Tool 2d Sound Field Controls Frequency selects the 1 octave center for the sound field simulation Band Widening selects the bandwidth of the simulation Generate generates the sound field simulation I I I I A o m 52 8ft 85 6ft 118 4ft 20 01 17 72 128 22 15 42 Parameter Boxes shown above display the position of the cursor The lefthand pair of boxes indicate the realtime position in X Y coordinates of the curser The righthand set of boxes indicates the position of the last mouse click The large box in the center is the progress box active while DDT2D calculates the Sound Field The Frequency Response Window To see the frequency response at any location or in up to 10 locations place microphones in the Sound Field The response will immediately appear in the Frequency Response Window Move your curser over a response curve The frequency will appear in the grey box and the amplitude will appear in the colored box corresponding to the curve The 3 buttons at the top select the vertical resolution 3 6 or 10 dB per division The check box below the graph selects a 1 30ctave smoothing which will be applied to all the active curves in the frequency response window Frequency response 40 160 640 2560 10240 Frequency Mic 111 88 Mic 2 a Mi
29. y clear that putting a pair of SH50 speakers in the center of our room will be the best way to get the coverage and response we want But what if we wanted to add a subwoofer Should we fly it up in the ceiling or place it on the ground The first step is to re orient ourselves In the last part of this exercise we were looking down from the top at the plan view Even though we did not actually build a room the y axis was representing the left right dimension of the room and the x axis represented the front back dimension Now we are going to look at the elevation view The y axis will be the up down and the x will be the front back So lets clear the Sound Field screen by turning off our speakers and microphones DDT 2d Manual Page 20 Danley Design Tool 2d Lets try the Draw tool DDT2d allows you to draw rooms of any shape to get a better handle on coverage These rooms or shapes do not have any acoustical properties at all DDT2d does allow you to build rectangular rooms which do have acoustical properties but we will cover that feature later Lets assume that our room is 75 feet long and SSE Eee 25 feet high We can draw a rectangle of those 1 y1 12 y2 dimensions using the tools available under the oP laad ee Draw tab You can draw lines freehand using the Draw Line tool but lets use the add line by coordinates tool Lets draw the floor first x1 should be 0 00 y1 0 00 x2 75 00 and y2 0 00 When you click on line f
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