MANUFACTURERS OF LOUDSPEAKER COMPONENTS DKM … · MANUFACTURERS OF LOUDSPEAKER COMPONENTS DKM has over ... MANUFACTURERS OF LOUDSPEAKER COMPONENTS ... Both methodes safes time and

DR. KURT MÜLLER GMBH & CO. KGMANUFACTURERS OF LOUDSPEAKER COMPONENTS

� DKM has over 70 years of experience in development and production of loudspeaker components

� Consistent, repeatable and reliable processes in production

� Extensive knowledge about specific material

Loudspeaker Parts as the “Interface” to the Human EarDKM Engineering creates Sound

� Extensive knowledge about specific material properties, used for moving loudspeaker parts

� Material selection according to customer requirements� Prediction of dynamical material / component behaviour� Diagnostics and consulting for individual solutions� Continuously R&D activities for material improvement


The influence of different paper cone materials on the frequency response curve of a 6.5" loudspeaker

Loudspeaker Parts as the “Interface” to the Human Ear� Extensive knowledge about specific material properties, used for moving loudspeaker parts

DKM Engineering creates Sound

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� Consistent, repeatable and reliable processes in production� Extensive knowledge about specific material properties, used for



� Material selection according to customer requirements

� Prediction of dynamical material / component behaviour� Diagnostics and consulting for individual solutions� Continuously R&D activities for material improvement


Material d (mm) m (gram) rho kg/m^3Q

(dB) Q R=mfs/(Qd^2) fs (Hz) creep (dB) E (MPa) Xp (mm) ηηηη

HO36 0,038 0,630 1395,000 15 5,62 876,09 11,3 0 9723,97 0,500 0,18

HO50 0,052 0,862 1395,000 18 7,94 369,01 9,2 3442,10 0,500 0,13

HO 75 Alu 0,077 1,276 1395,000 13 4,47 698,44 14,5 3899,50 0,300 0,22

HO 100 Alu 0,104 1,723 1395,000 16 6,31 530,20 21 1 4483,59 0,300 0,16

HO 125 Alu 0,131 2,170 1395,000 22 12,59 271,24 27 1 4671,31 0,750 0,08

HO 200 Alu 0,207 3,429 1395,000 19 8,91 359,21 40 1 4106,13 0,750 0,11

PPO 500 klar 0,515 5,535 905,000 17 7,08 182,77 62 2 1033,94 0,150 0,14

PPF 300 0,360 4,275 1000,000 15 5,62 328,52 56 0 1907,44 0,800 0,18

PPF 350 0,415 4,929 1000,000 15 5,62 330,78 65 0 1933,79 0,300 0,18

DKM Engineering creates Sound Material selection according to customer requirements

PPF 400 0,470 5,582 1000,000 15 5,62 332,52 74 0 1954,10 0,200 0,18

PPF 450 0,535 6,354 1000,000 20 10,00 195,35 88 0 2132,74 0,050 0,10

PPF 500 0,620 7,363 1000,000 18 7,94 253,21 105 0 2260,87 0,200 0,13

PPF 600 0,725 8,610 1000,000 27 22,39 92,20 126 0 2380,92 0,200 0,04

PPF 700 0,811 9,632 1000,000 25 17,78 110,35 134 0 2152,03 0,100 0,06

SPN 125 0,130 1,436 930,000 10 3,16 214,94 8 4 277,62 0,400 0,32

SPN 160 0,170 1,878 930,000 8 2,51 300,03 11,6 4 341,33 0,150 0,40

SPN 240 0,242 2,673 930,000 14 5,01 154,81 17 8 361,77 0,300 0,20

2102 A 1,036 14,888 1210,000 0 1,00 410,58 29,6 1 77,86 0,100 1,00

MN100 schwarz 0,100 1,425 1200,000 23 14,13 197,75 19,6 3633,90 0,400 0,07

MN120 0,120 1,710 1200,000 7 2,24 795,74 15 1478,02 0,500 0,45

MN150 0,147 2,095 1200,000 12 3,98 448,09 18,4 1482,05 0,400 0,25

MN40 0,045 0,641 1200,000 1,00 2343,58 7,4 2557,99 0,200 1,00

MN80 0,080 1,140 1200,000 17 7,08 301,96 12 2128,35 0,300 0,14

MN100 gelb 0,100 1,425 1200,000 14 5,01 415,16 14,6 2016,35 0,400 0,20






� Material selection according to customer requirements

� Prediction of dynamical material / component behaviour

� Diagnostics and consulting for individual solutions� Continuously R&D activities for material improvement


DKM Engineering creates Sound

Loudspeaker Parts as the “Interface” to the Human Ear� Prediction of the dynamical material / component behaviour with Fine Cone (Loudsoft)






� Material selection according to customer requirements� Prediction of dynamical material / component behaviour

� Diagnostics and consulting for individual solutions� Continuously R&D activities for material improvement


� Diagnostics and consulting for individual solutions with 3D Laser Vibrometer TechniqueToday, we invest a lot of money in finest audio equipment (best electronic, proper signal transfer and high-tech mechanic) to improve the signal output on the highest quality level. In our opinion, the most important fact is, how sonic will be produced on membranes and which content of frequencies will be able to reach the human ear finally. Therefore, the electro-acoustical transducer (loudspeaker), with his moving loudspeaker parts, is one of the main decisive and


transducer (loudspeaker), with his moving loudspeaker parts, is one of the main decisive and influencing factors...

� In combination with various tools for development (for example 3D Laser-Vibrometer) we are able to find individual solutions for our customers and to shoot troubles right in the beginning.

A very simple problem is given as an example as follows:



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Strong mode on cone MK118/GST at radius 40 mm



Modification of cone MK118/GST at radius 40 mm

�� influence of thinner cone wall thickness


� Diagnostics and consulting for individual solutions with 3D Laser Vibrometer Technique

Comparison of hard- and soft tweeter dome performance at 8.7 kHz�� Influence of weave anisotropy (warp and woof) on brack up modes



� Extensive knowledge about specific material properties, used for moving loudspeaker parts� Material selection according to customer requirements� Prediction of dynamical material / component behaviour� Diagnostics and consulting for individual solutions with 3D Laser Vibrometer Technique

Conclusion:1. We are able to measure and provide the phsically data of our common materials for FEA

(FineCone or similar).


(FineCone or similar). Therefore, our customers will receive the values for Young‘s Modulus and damping for example.

2. The 3D Laser Vibrometer Analysis (Klippel) supports to localize different acoustic problems.These information gives us the possibility to modify � materials, mechanical parameters, etc.� design or structure,� after treatments at the right point.The Laser equipment enables us to separate problems coming from the membrane surface or environment (other chassis components, wall reflexions, enclosure, art effects, etc.).

3. Both methodes safes time and money in case of trouble shooting during development periode and serial production at the customer side.

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MANUFACTURERS OF LOUDSPEAKER COMPONENTS DKM … · MANUFACTURERS OF LOUDSPEAKER COMPONENTS DKM has over ... MANUFACTURERS OF LOUDSPEAKER COMPONENTS ... Both methodes safes time and