PA Loudspeaker System Design Using Multiphysics Simulation

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1 PA Loudspeaker System Design Using Multiphysics Simulation An approach to reduce prototype and measurement times to a minimum By Riccardo Balistreri, QSC Audio Products LLC

2 Ceiling PA Speaker

3 Ceiling PA Speaker System

4 Ceiling PA Speaker Without grille Tweeter, Woofer, and Vent visible

5 Microphone array courtesy of Ron Sauro NWAA Labs

6 Frequency responses at different angles compared to on axis (usually the 0 degrees)

7 Frequency response versus angle, Sound Pressure Level displayed as gradient of colors (red=higher value, blue=lower).

8 3d version of frequency response versus angle

9 Normalized Polar Response. For a single frequency the on axis value is taken as reference, the SPL values at other angles are then measured and placed as ratio on the graph for the same frequency

10 Directivity index. Represents the ratio between the device under test sound intensity at different angles to an omnidirectional source of same average intensity expressed in decibels.

11 Approach with COMSOL Useful existing models: Baffled Membrane Loudspeaker Driver Lumped loudspeaker Driver Loudspeaker Driver in a Vented Enclosure

12 Design Guidelines for Product Development Baffle Diameters Enclosure Height Performance (SPL and frequency response) Loudspeaker Driver Estimated Volume Lumped Parameters 2d/3d Model

13 Lumped Parameters Woofer Thiele/Small Parameters Tweeter Parameters are attained in a slight different way as they have their own enclosure

14 Lumped Parameters for the woofer side Vo Low pass filter, in this case 2 nd order, but several configurations can be tried + - Low Pass Filter L1 C1 Generator that represent the amplifier (a resistor representing the output impedance could also be included ) i c Re Bl. u D is the back EMF induced voltage where u D is the velocity of the voice coil in the gap R'( ) Le ω Bl Electrical to Mechanical Domain u D Electrical aspects of the loudspeaker driver, Re would be the DC resistance of the Voice Coil, while Le, R are frequency dependent parameters, a more complex model that includes other function dependent parameters can be used + - Bl + - value=1 i c Mechanical aspects of the loudspeaker driver, Mms would be the moving mass, (voice coil, cone, dust cap, portion of the spider etc.), Cms the compliance of the moving system (spider with surround), Rms are the mechanical losses Mms Bl. i c is the Lorentz force that gets applied to the moving parts Cms Rms u D Mechanical to Acoustic Domain F D Sd + - value= 1 F D is the force coming back from axial pressure on the diaphragm coming back from the FEA model the axial acceleration of the diaphragm necessary in the FEA model is coming from the velocity per pulsation (inverse of time) Pressure in Acoustic Domain SPEAKER

15 Acoustic model

16 Acoustic model

17 Results

18 Results Inside the Box

19 Vented box Results

20 Vented box Results

21 Acoustic model

22 Results Tweeter frequency response W

23 A look at the problem W Results

24 A look at the problem W Results

25 Results A solution to the problem W

26 Results Tweeter frequency response W

27 Results Tweeter frequency response

28 A look at the problem W Results

29 A look at the problem W Results

30 Map Results

31 Map Results

32 Results Other example this time with a closed box and a low pass filter

33 Results Closed box with low pass filter

34 Results Frequency response with filter

35 Results Two way closed box system

36 Results

37 Results tweeter polarity inverted

38 Results Using parameters for another woofer different tweeter and waveguide geometry and crossover for both

39 Results Two way system frequency response W

40 Results Same seen at different angles

41 Polar responses Results

42 How close simulations are to reality? Results

43 Results

44 10k Results Meiloon Luix TW 4V 1m 2pi2 MLS 00deg.m ls (db) Level, Clio MLS SPL 110 on axis m easurem ent curve at 60 degrees 10k 2k 3k 4k 5k 6k 7k 8k 9k 20k Frequency ( Hz)

45 Thank you Results

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