Speaker Cones - Fabrication, Components, and Functionality
Eternal Power Sdn. Bhd. was established in 1995 in Malaysia as a manufacturer of Cone Paper, Dust Cap, Tweeter Cone, and PA Cone Paper. Eternal Power Sdn. Bhd obtained our TS-16949 QMS certification in 2012, and ISO-14001 in 2013 with ongoing improvements to our systems and processes to upgrade our level of ISO and QMS certifications.
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It is taken as a basic truth that most speaker factories can duplicate an existing design’s frame and magnetic structure, but finding the soft parts suitable is an art. The cone, surround, spider, and dust cap contain quite a few on the secret components in speaker design. Choosing the ideal soft parts is difficult, using the most essential aspects getting the components, process, and fabrication.
Speaker engineers realize that 3 essential physical properties determine a material’s suitability for use in loudspeaker diaphragms - stiffness, low density, and internal damping. Stiffness, in unique, determines the bending wave velocity, and for any given design, the frequencies at which the initial break-up resonance happen. This resonance inside a diaphragm determines the transition point above the frequency point at which the diaphragm loses piston motion and response becomes rougher.
The higher Young modulus (and the steepness on the cone’s physique angle and the diameter) decide at what point factors come to be nasty. The degree of internal damping, or loss factor, determines the material’s effectiveness in suppressing such resonances, that is specifically essential near and above the upper resonance. Endumax absorbs really higher amounts of energy. Whilst this property was developed for ballistic protection products, the properties also make the material especially suited for speaker diaphragms as there might be significantly less energy reaching the surround edge to reflect back.
The very best supplies may have higher velocity and higher damping, but for those who've used titanium cones and domes, you understand that in quite a few cases these properties are mutually exclusive. Endumax, which can be equivalent to aramids (e.g., Teijin Technora and DuPont Kevlar), offers a fantastic mixture of each damping and velocity. Materials including Endumax have low density so using numerous layers will outcome within a stiffer and stronger cone with low weight.
Loudspeaker cones are most generally formed from paper pulp, but plastics (e.g., polypropylene) are also well-liked, and sheet material might be vacuum thermoformed (like melting hot cheese more than a form), compression molded, positive/negative molded (or injection-molded) into the preferred shape. Metal cones are also used. Other high-tech solutions which have achieved results include things like a sandwich construction with skins and honeycomb or foam cores.
Within the final years, a number of notable composites for speaker cones and diaphragms have already been introduced towards the speaker business. These contain woven, cross-ply layers and non-wovens, glass fiber, carbon fiber, and aramids (e.g., Kevlar), thermoset, and thermoplastic resins.
Usually, a specialist cone manufacturer fabricates cones for speaker assemblers, but the largest offshore speaker companies generally have their own in-house cone fabrication facilities. During the last 25 years, I have worked with numerous in the suppliers that give supplies for the cone sector and have visited a lot of the cone factories in Asia as well as the US.
At first glance, absolutely everyone is using the exact same procedures, but when you dig deeper, the subtle variations may be important. Within this post, we take a look in the fundamentals of producing distinctive varieties of cones - but what I go over here doesn't commence to touch around the secrets that the cone companies have discovered from decades of experience.
Paper Pulp Cone Fabrication
The process starts with sheets of various types of pulp. The pulp might come from Douglas fir or exotic blends, which include things like a bit of eucalyptus from Brazil, Cambodia, or Australia (pretty stiff), other specialty pulps from New Zealand, or in the hemp family (Fostex and Dai-Ichi like banana leaves), kapok seed fibers (the poor man’s Kevlar), or a variety of synthetic fibers. The pulp recipes, additives, pulp slurry beating process, and cone forming strategies all contribute for the loudspeaker cone’s characteristics. Young’s modulus (speed of sound), tan delta (internal damping), and mechanical parameters (e.g., tear strength, burst strength, and so forth.) are all factors that separate the toy cones in the audiophile, studio monitors, electric guitar, or pro sound diaphragms.
Other considerations are wet strength and moisture regain. Will the cone fail if used inside a humid environment, will that studio monitor sound the identical on a humid day, and how vulnerable is it to UV, fungus, ozone resistance, and so on? We do not consider the speaker cone’s selection as geographical but kind surrounds usually do not survive in Brazil or Mexico - among corrosive city fumes and microbial foam consuming bugs, you'll see a lot of rubber or thermoplastic elastomer edges.
Look continues to be one more consideration, and there are various secondary surface remedies that add components that cannot be completely achieved together with the cone paper traits. After the recipe is chosen for a distinct production run, the acceptable paper pulp is soaked in hot water for any time period determined by the manufacturer. Pieces are torn off the wet pulp sheets (by hand or by machine) and thrown into a water-filled pulp beater. The beating process disperses the fibers whilst also fibrillating (fuzzing them up) so they're going to tangle with each other, thereby holding the cone with each other. Many of the market uses the old-style beating machines, which offer potentially exceptional fibrillation. From time to time hydro-pulpers are used, which is usually faster in creating the slurry but may not do significantly fibrillating work around the fibers.
Additives are thrown in to the beater (e.g., salts to hold the dyes which are largely black), and then the contents are mashed some extra. Inside the case from the beating machine, there is certainly a beating wheel, that is progressively brought closer to the beater bedplate because the pulp is worked into a slurry of fibrillated fibers. At some point, this soup is transferred to a holding tank, which has an agitator to maintain the slurry dispersed and homogenized inside the tank. The pulp’s fiber length, density, and “secret sauce” are factors that distinguish diverse speaker cones intended for subwoofers, midranges, musical instruments, and so on.
There are actually three popular cone paper forming strategies: pressed, semi-pressed, and non-pressed cones. Inside the case of your pressed cone, the pulp slurry can be dumped into a bin and drained via a fine mesh screen. The paper fiber solids are left on this screen after the liquids happen to be drained out with the bin. The remains are removed in the mesh and deposited onto the cone pressing machine. Heated optimistic and adverse metal cone-shaped forms then press the pulp. The remaining water steams out on the cone, which can be removed in the forming tool.
If the cone’s density is as well low, then the cone may very well be too dead-sounding. When the cone is pressed also really hard and thin, then breakup (“cone cry”) will be much more noticeable, especially at higher sound levels. The cone density and pulp composition affects the internal loss (“deadness”) with the cone material, which will contribute towards the speaker’s sound excellent. The speaker cone shape (profile) is usually a important aspect within the speaker’s sound excellent and performance. In the event the cone is straight-sided (probably with concentric reinforcing ribs molded inside the cone physique), it will be the strongest and more rigid at pretty low frequencies.
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Datum: 30.12.2020 - 08:20 Uhr
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