Transcript
V O L U M E
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I S S U E
6
A P R I L
2 0 1 3
IN THIS ISSUE 1
INDUSTRY NEWS & DEVELOPMENTS By Vance Dickason
5 10
PRODUCTS & SERVICES SPOTLIGHT The Beryllium Advantage By Michael Adams and Ken Berger
Industry News & Developments By Vance Dickason Edward T. Dell, Jr. (1923–2013) Ed Dell, founder of Audio Amateur, passed away on February 25, 2013. Ed was a remarkable man who embraced life and all it had to offer. He was an Episcopal minister, a writer, an editor, and later in life, a publisher who brought DIY audio design and construction to enthusiasts around the world. His magazines included: The Audio Amateur, Speaker Builder, Glass Audio, audioXpress, and of course, Voice Coil. A tribute to Ed’s work is planned for Voice Coil’s May issue.
Prolight + Sound 2013 This year’s Prolight + Sound trade show is being held April 10–13 in Frankfurt, Germany. Prolight + Sound 2013 is one of the leading international fairs for technologies and services for events, installation, and production. It is also the sector’s largest meeting place. Prolight + Sound presents the complete range of products for events and event halls from around the world. As such, Prolight + Sound is the ideal venue for obtaining an
15
ACOUSTIC PATENTS
20
TEST BENCH
By James Croft
A New Compression Driver and Horn and Two Ribbon Transducers By Vance Dickason
28
INDUSTRY WATCH By Vance Dickason
overview of new products and innovations in the fields of audio, video, lighting, stage, effects, and the integration of all these disciplines. It presents not only products, but also solutions, services, and concepts for events. This should appeal to buyers from all trade and service fields with commercial applications for the technologies. At Prolight + Sound, you can learn about the latest technological developments, increase your practical knowledge by attending a variety of seminars and workshops, and expand your network of regional, national, and international contacts. Last year’s Prolight + Sound 2012 show attracted more than 876 exhibitors with approximately 40,894 people in attendance. A partial list of loudspeaker manufacturing and loudspeaker-related exhibitors for the 2013 event includes: Active Audio, Acustica Beyma, Adamson Systems Engineering, Alcons Audio, Audica Professional, Audiocenter International, Audiodesign, B&C Speakers, BMS Speakers, Bose, Brüel & Kjaer Sound & Vibration Measurement, Celestion, Ciare, Coda Audio, Crafft Audio, D.A.S. Audio, Destilan Deutschland, Dr. Kurt Müller, Dtech Audio, Duran Audio B.V., Eighteen Sound, FaitalPro, Fane International, FBT Elettronica, Fohhn Audio, Four Audio, Frank Audio, Genelec, Georg Neumann, G+M Elektronik, Guangzhou CVR Pro Audio Factory, Inspired
T TECH BRI TRUEXTEN
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TECH BRIEF
me in Radian 950PB n BeX™ Be4016ryllium Do mpressio t Be4008 and Be4016 in the Radian 950PB comprese BeElectro-Acousticsrm Engineer at Coperforma d Rang J. Andrews, Sr. nce of the Truexten effectively, one product. as, the high rge Fo Extende blyPeterforourLa been noticing this combination to sell Let e Math! both mounted in a customers have Your Ears DoandTh Forks: r has even decided rsTuning Radian’s 1245-16, driver distributo t Be4016 Europeanive the compression Assem Recently, Saye s: the Truexten the sion driver. One Dr Chamber with diaphragm twoSam ne is ~0.5m from nce t Acoustic Test onsofand 2
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performa Engineer n Simm Electro-Acoustics and the micropho in the Truexten 2 the J. Andrews, Sr. taken will compare ws , Gordo Peter chirp (log sweep), All curves are This Tech Brief 1 Peter Andre for electro-acoustic transducers, it is , USA with a 1Vrms sine , compression driver.es, CA 90034 is driven that beryllium is the lightest and stiffest metal versions. are aware 950PB-16 all Buck engineers g 8-ohm diaphragm in red,metals from a theoretical discussion Radian many audiophiles and Marsh AngelWhile comparin is shown ‘lightweight’ horn. common LosEach 2386Inc, has over other it beryllium diaphragm be expected on a JBL that to grasp the vast performance advantages nology, results would mounted not easy , USA hed. The we the exact same dimensions; one made of forks to They show 1 94538 threes.tuning throat. Similar perhaps machined Psychotech and unsmoot datasheet demonstration, ave)audible nt, CA an easily (12th-oct paper 1. For isn’t compression driver whitesmoothed Fremolike our see in published there at a recent trade show demonstration. these ‘ping’ think one mightWe , both ofusion, responses evento you had a chance hope of what of beryllium. ativeone ion Electr observer might 2 one of titanium, shows representand Mater show on-axis frequency aluminum, we curves (left) are same level. A casual range (beryllium
Composite the First Titanium Genuine range at roughly in the critical 2-10kHz in blue. The smoothed AlBeMet® Metal Matrix Magnesium the aluminum the same frequency Properties and flatter response Beryllium s cover roughly higher output except for the both diaphragm n T between the two ; no smoothing much difference ABSTRAC t compressio Frequency Response large formaer surround is Physical Properties 4.51 +3dB near 5kHz). 1.74 2.90 of a newct smoothed 2.07 of polym 1.84 3 long life testing ; 1/12th-o y Response new type promises to give the lifeȡ Density @ 25°C, g/cm e, and Frequenc 8.60 26.1 n manufactur lium dome and 13.4 13.9 pated over finite This desig 11.5 opment, beryl Į CTE @ 25°C, ppm/°C The devel ragm using a ved performance. performance anticicomparisons, 16.4 159 in lium, 130 210 properties tests of beryl driver diaph exhibits impro or no change 216 ial ing of mater that Conductivity @ 25°C, W/m·K sive set 0.523 detailed reliability with little ises include ibed includ Ȝ Thermal 1.025 0.800 exerc comprehen rs is descr 1.56 1.925 plane wave and good ragm. Design simulations. A n drive '7TIGM½G,IEX$'.K ø' l on a 2 inchured in the compressio analysis of the diaph sis, and moda feeling much heavier in analy diaphragm let time domain were meas. when picking up the three forks is the difference in weight, with the titanium 3 element ences titanium you might notice thing wave . The aluminum fork is definitely 4kHz e first differ Th and 4.50g/cm at density, tion, high relatively above a antial has Subst your hands range to the other two. Titanium, of course, aluminum, response, distor 3 our example tuning forks are: encycompared modes. Properties that, only 1.85g/cm . The actual masses of the frequ even lighter than frequency laser scans of 344 ularly in lighter, at 2.70g/cm3, and the beryllium forkMechanical 196 570 partic , and 435 ories 370 tube MPa ce categ UTS Ultimate Tensile Strength, 275 performan 105 Aluminum Fork = 55.7 g (2.0 oz.) 480 321 240 oz.) Titanium Fork = 93.7 g (3.3 of a Strength, MPa Yield YS ragm 105 44.0 diaph oz.) g (1.4 140 38.5 193 BerylliumialFork high-frequency 303 for =the compared Modulus, and dips, in the the mater beryllium are E Young’s ts or sharp peaksGPa (blue) N 0.37 noise, pitch (roughly C5) when struck on a lium as diaphragm 0.35 of likeonen the same 0.30 ring at nearly r comp rties e aluminum 0.17 and titanium ODUCTIO . Thforks aluminum the Othe - 0.180 that looks 0.070 stiff use ofThberyl noticeofiswhat because might dense modal you diaphragm er than aluminum, it is rial prope thing withtitanium to read the rs, e next is ~1.6x 1. INTR nofdrive Ratio purpose. though 20kHz, Ȟ Poisson’s bit harder E6). ale for the(right) overEven this (roughly are amate pitch 4,825 higher . The break-up much forthe amodes ing at ressio comp smooth to rings 5,029 higher a ration edtrans packed ior beryllium ducer curves but 6,948 exit ~2.4x remains factur nts surface, densely hard (red) frequency 9,656 super rather two inch predicted Manuresonant preseThe unsmooth materials. 12,833 stic in1both which diaphragm to bebut ,m/sec g Sound, ard the beryllium the same paper is not noise, essentially this found white Speed surround. c tic This paperency electroacou heavier, stand our of ~1.7x intestin course, whereasgiving done and are many acous and the region. Ofum ~10kHz, fitalso l work coil above nsive theoretica modal the high frequ num and titani to retro behavior voice prehe with this show ned the agrees shows Com . as This desig 23kHz. Laser scans are given with alumi bly,clearly response) nts, such which isstarting at around veme g results materials. response (impulse break-up for impro of the assem ssed ility testin aring the three the time-domain reliab break-up. behavior, of addre this and onsetibed, to hide nted comp are also are descr usually is) smoothed are prese The above table contains values from processes terminated tubefrequency. response can be (and Truextent and AlBeMet are registered MATERION CORPORATION a the ragms g. www.matweb.com for Beryllium, While ELECTROFUSION trademarks of Materion Brush Inc. data on three diaph of what’s happenin www.materion.com/electrofusion AlBeMet AM162 rolled sheet, of thegives ERIAL tries Boulevard South Grimmer us a clearer view 44036indus behavior GM MAT Magnesium annealed sheet, Aluminum 94538-6346 Fremont, CA x-ray technology DIAPHRA e 2024-O, and Titanium Grade 2. of high includ 510.661.9755 CORPORATION M AS A of a number s for beryllium +1 MATERION BERYLLIU extent
[email protected] standing used in under cation ORY OF SION www.materion.com/tru which is Appli ELECTROFU cing our 2. HIST e metal nergy physics. 44036 for Grimmer Boulevard Southadvan and uniqu 94538-6346 and high-e instruments used Fremont, CAonents. is a rare ft comp aerospace, Beryllium scientific m and aircra+1 510.661.9755 care, medical, materion.co ing tures truextent@ in health struc includ ts used satellite componenst laws of nature, MATERION CORPORATION deepe ELECTROFUSION the www.materion.com/truextent Brush Inc. ®
Copyright
© 2011
Materion
®
44036 South Grimmer Boulevard Fremont, CA 94538-6346 +1 510.661.9755
[email protected]
Aluminum
2.78 23.2 193 0.875
186 75.8 73.1 0.33 5,128
TDS2011
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sound culture www.rcf.it
LF18X451 WOOFER RCF was the first manufacturer to introduce many of the innovations now recognised as standard in professional transducers, pioneering new solutions, from inside-outside voice coils to dual spider silicon damped designs. Our range is capable of providing innovative tools and solutions for the most demanding speaker manufacturers.
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Figure 7: RCF ND950/HF950 SoundCheck CSD waterfall plot
Photo 2: Beston Technology’s RT002A ribbon tweeter Figure 8: RCF ND950/HF950 SoundCheck Wigner-Ville plot
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30
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W !W^ ] Q _ \ TEAMWORK
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TECHNOLOGY
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INVENTION
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ACOUSTICS & SENSORS
Loudspeakers Microphones Drivers Global Audio Components supplier to OEMs worldwide. Largest selection off-the-shelf micro-speaker designs for hand held devices.
Complete ODM Service, extensive in-house audio engineering capabilities, including anechoic chamber.
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