Loudspeaker Design & Testrequirements

The problems all loudspeaker manufacturers must solve

Peter Larsen

President, LOUDSOFT

Date 2017.11.08Invited by SOMA Acoustic /尚馬電聲科技敬邀

•1974 – 1987 VIFA – Chief Engineer

•1987 – 1988 Scan Speak – Chief Engineer

•1988 – 1991 Dynaudio – Chief Engineer

•1991 – 1993 JBL, California – Specialist designing tweeters – “Tweeter Peter”

•1993 - Independent Consultant

•2001 LOUDSOFT (Founder)Customers - Audax, KEF, Gold Peak, SEAS, Vifa-Speak, Peerless India,

NXT, GRAS...

About Peter Larsen

Peter Larsen - CONSULTINGCustomer loudpeaker design - experience, software, engineering skills

Asia: Fenda (F&D) Peerless India Tech AudioGGEC Pulsus, Korea TekzoneMicrolab Sambon, Korea Unicond, TaiwanSoundking Tymphany ZenmayNew Jialian Sinar BajaOHM Audio Asia Shinwoo, Korea

USA: Apple Pure Acoustics FZ AudioMisco THX BOSEPolk Audio Triad David Clark

Europe: Accuton Dali Ole Wolff ElectronicsBang & Olufsen DTU (DK University) ScandynaBentley Motors Focal Vifa-SpeakBlaupunkt MB Quart Kef / CelestionAiAiAi GRAS OHM, UK

Guest Lecturer:Feng Chai University, TaiwanDTU Technical University, Denmark

References

Dynaudio Woofer:15W75 and 20W75Alu frame, 3in VoiceCoil. Inside magnets

Dynaudio Esotech D260 Dome tweeter.

Ring radiatorsALMA Titanium driver

award 2012

Eg. Vifa-Speak R25TG

AnnularCompression

Driver CD10 (F)

Peter Larsen Driver designs

System designs

2.1 Home Theater System for Harman / Infinity

MicroPod for Scandyna

PURE Monitor series for Microlab

”by Peter Larsen”Beolab 3

Portable PA with Class D amps + DSP

Beolab 3

AiAiAi Headphone TMA

Car audio Projects

Volvo – XC90 and Premium versions

Dynaudio Speaker System

Bentley GT and Arnage

Speakers Systems

Case Study: Bang & Olufsen (B&O) Cone Design - 1

Beolab 3

What do you need to do this?

Loudspeaker development solves common problemsLOUDSOFT calls this the The FINE Circle

1. FINECone FEAInputs: Measured response, geometry, TS parametersDesign: Materials, (mass, stiffness, loss)

Construction ( gluelines)Tuning: Impedance simulated versus measured, flexural

mode controlOutputs: Response, DirectivitySuits sub-component design (parameter files e.g. dust cap)Includes air load

2. FINEmotor (magnet system and voicecoil)

Inputs – Geometry, magnetic material, wire (shape, type), formerMagnet type (Ferrite, neodymium, combination)Design: Sensitivity, Xmax, linearity, Qt (motor), shieldingSaturationOptimisersFerrofluid

Suits all motor typesMicrospeakers to large woofersRound, rectangular motors

3. FINEBoxEnclosure design (sealed, vented, bandpass, ....)Thermal compression simulation

4. FINE X-overResponse optimisationImpedance limits, Power dissipationTapped structuresTime, distance compensation

6. FINE R&DAnechoic, time windowed measurement support

5. FINE QCGo – No go decisionsSelf-learning distortion tests (rub and buzz)Driver/enclosure pair matchingProduction batch (daily) averages

Additional slides

LOUDSOFT Cooperation partners

DTU Technical University of DenmarkFeng Chai University, Taiwan

Projects DTU / LOUDSOFT:Ph.D New Amplifier Technology / LoudspeakerPh.D Amplifier / Loudspeaker Test interface (HTH funding)

GRASPascalScan-SpeakGN-JabraMotorolaTymphanyVECORedrock

Basic Loudspeaker AcousticsUnderstanding the Loudspeaker componentsHow to define FEA simulationBasic FINECone FEA modelling

Advanced principles of FINECone FEADefining and finding Material ParametersSpecial FINECone FEAAdvanced FINECone modelling

Education – loudspeaker academy

Europe

AM DenmarkANSAlpineASK IndustriesAudio PartnershipAudio NoteAudio ProAudio TechnologyAudiversAthens SpeakerAudyonBang & OlufsenB & CBehringerBentley MotorsBlast LoudspeakersBlaupunktBosch, BerlinBosch, HildesheimCambridge SiliconCantonCharioCoherent AcousticsCooper, UKCreek AudioCrystalD&M PSSDaliDavis AcousticDLSDTU, DenmarkDynaudioEhmann Partner

ElacElettromediaFAITALFANEFink audioFOCALGenelecGN NetcomGrewusHarbeth, UKHarman, FranceHarman AutoJabra R+DKEFKuhnke SupplyKurt MüllerLautsprecher TeufelLibratoneLLBLopacanLPG LautsprecherMB QuartMillonMissionMKG SoundMonitor AudioMordaunt-ShortMusikelec. GeithainNEXOO-EngineeringOhm UKOle Wolff ElectronicOliver Schrott Kommunikation

Panasonic, DEPanasonic, UKPioneer, FrancePhilips, DendermondePhilips, LeuvenPrecision DevicesProcellaPylonRaidho AcousticsRCFReVoxS1nn, GermanySaitekSC BautechScandynaScan SpeakSEASSiltechSiltech – IAHSony EricssonSP AcousticsSwiss AudioT+A ElektroakustikTannoyTheis & VögeleThiel & pPartnerTonkraft AudioTriangleTVM. Czech Rep.University of MadridVelodyneVifa TymphanyVisatonWelcohmWwa

America

AccusonicAcoustic DesignAdamson AudioAdvanced AcousticAliphcomAlpineAmerican Audio Co.Andover AudioAPIAppleArelle LabsAudilabAudysseyAuradyneAuraSoundAvalon AcousticsBeatsBlue SystemBogenBomberBoseBravoxCerwin-VegaCiscoCJS LabsCLCCorrelated MagneticsCreativeDavid ClarkDB AcousticDiamond AudioDolby Audio

Ecco GroupElac, USAEminenceEros. BrazilExtron ElectronicsFerrotecFitbit Inc.FZ AudioFujitsu TenGibson ProHarman MotiveHarman Multi MediaHendershotIncriminatorInfinity SystemsInnovative FluidicsIntersource OEMJames LoudspeakerJC SalesJim RushJL AudioKlipschKSC IndustiresLa Clef de SolLegacyLitePointLogitechLoudspeakerComp.MagicoMcIntosh LabsMillson Custom Sol.MiscoMontana Speakers

Motorola SolutionsNH IndustryNMBOrca designPanasonic, USAParadigmPhilips, USAPioneer, PomonaPioneer, San DiegoPolk AudioPreco ElectronicPresonus AudioPSBQSCRedrockRockfordRussoundSamsunSakarScosche IndustriesSeleniumSigneoSonanceSonasSonosSoundMattersSound ResearchSpqder. BrazilSymphones AudioTC SoundThiel C. SourceUltimateVance DickasonWalt Disney Imagineering

SamsungSambonSanyoShinwooSeoul Nat. UniversityShengYun AudioShin-hint GroupSinar BajaSolidexSonavoxSonySound FactorSoundKingSoundMatersS.S.ElectronicsSung Ju, KoreaSun TechniqueSwan SpeakersTaiwan UniversityTaiyuTankoTCLTech-AudioTekzoneTianleTokyo Cone Paper MFGTSITrueanalogTurbo PowerUnicondUnicornUniversity of TaiwanVecoYamahaZenmayZsound

Asia

A & D Audio Co.AAD EngineeringACEAcoustic SoundAdvanced AcousticsAdvanced SoundAlpine, JapanAnam, KoreaAoleiAudio PlusAudio StarBehringer, ChinaBe-StartBetetech, AustraliaBlue Tek (Samsung)BluecomBohai ElectronicBoproBosch, MalaysiaBSE, KoreaBujeon, KoreaBumjinChiyuChiyoda KogyoCompupalCosonicDai-Ichi, MalaysiaDai-Ichi, PhilippinesDakshin, IndiaEden Info CenterEdge WoundElder AudioEnrique StilesEastern AsiaEstec, Korea

Eva WangEvervictoryFendaFeng-Chia Uni.FilsForgrandFortune GrandFoster, JapanFS AudioFSTFujiconFujitsuGGECGuoshengGuang-Fann Co.Guangzhou BaishengGolden Voice Tech.GuangshunHanbittniHang ChengHeng KeHermit, IndiaHi powerHigh EndHighhitHornsonic Intern.HoshengHygeia ElectricalIntensityInter-M, KoreaIST Co. Ltd.IwaiJalung Co.Jia Shan

Jiefu Electro AcousticJuseong CollegeJ&B Sound, IndiaKenwinKorea OmyangKorea TopToneKSYLG, KoreaLEADtechLeiloLilac, JapanLightion ElectronicLoqitechMaja Agung Elek.MeiloonMerry ElectronicsMicrolabMinebeaMotorolaNansinNew JialianNSSC, KoreaNUTEK CorporationPanasonic, JapanPanasonic, SingaporeParty HousePeerless IndiaPhilips, ShenzhenPioneer, JapanPremium, ChinaPulsusQiaojanQsun Music OneR & S ElectroncisReaxt Electronics