BMW E92 helisüsteemi modifitseerimine
Laen...
Kuupäev
2025
Kättesaadav alates
11.09.2025
Autorid
Ajakirja pealkiri
Ajakirja ISSN
Köite pealkiri
Kirjastaja
Eesti Maaülikool
Abstrakt
Auto helisüsteemides on tavapärane kõlarite paigutus enamasti probleemne, mille põhjustavad akustilised lühistused ning resonantsidest tekkinud moonutused. Käesolev töö tugineb varasematele uuringutele, mis käsitlevad sõidukite interjööris esinevaid akustilisi probleeme. Töös keskendutakse BMW E92 helisüsteemi põhjalikule modifitseerimisele saavutamaks realistlikumat helipilti ning moonutuste vaba keskkonda. Töö eesmärk oli hinnata, kas alternatiivne kõlarite paigutus, eriti Infinite Baffle tehnoloogial põhinevad lahendused suudavad pakkuda kuulamisel paremat helikvaliteeti kui tehases paigaldatud süsteemid. Andmete kogumiseks kasutati subjektiivset kuulamiskogemust ning mikrofoniga mõõtmisi REW tarkvara abil. Süsteemi häälestamiseks rakendati täpseid elektroonilisi filtreid, aegviiteid ja tämberplokke, et tagada optimaalne sageduskarakteristik. Töö käigus selgus, et armatuurlaua ülaserva paigutatud kesksageduskõlarid parandavad helipildi kõrgust, ruumilisust ning fookust. Brax ML8 madalsageduskõlarite kasutamine võimaldas paremat dünaamikat ning sujuvamat üleminekut kesksageduskõlaritele. Pagasiruumi paigaldatud 18 tollised bassikõlarid suutsid taasesitada ka sagedusi alla 20 Hz, pakkudes ka füüsiliselt tajutavaid madalsagedusi. Alternatiivne paigutus ületas oluliselt originaalsüsteemi võimalusi ning kinnitas, et läbi mõeldud Infinite Baffle lahendused võivad sobida ka reaalseteks projektipõhisteks lahendusteks.
In automotive audio systems, conventional speaker placement is often problematic due to acoustic nulls and distortions caused by resonances. This study relies on previous research addressing acoustical issues within the vehicles’ interiors. The focus is on the modifications of the BMW E92 sound system to achieve a more realistic soundstage and a distortion-free listening environment. The objective of this work was to evaluate whether the alternative speaker locations installed in infinite baffle technology could provide a better sound quality compared to a factory-installed system. Data was collected through subjective listening and microphone-based measurements via REW software. To fine-tune the system, precise electrical filters, time alignment, and equalizations were applied to ensure an optimal frequency response. The results showed that installing midrange speakers on top of the dashboard significantly improved soundstage height, imaging, and focus. The use of Brax ML8 midbass drivers allowed better dynamics and smoother transitions to the midrange speakers. The installation of 18-inch subwoofers in the trunk enabled the reproduction of frequencies below 20 Hz, providing physical feedback. The alternative layout significantly outperformed the original system, confirming that a well-designed Infinite Baffle system can be a viable option.
In automotive audio systems, conventional speaker placement is often problematic due to acoustic nulls and distortions caused by resonances. This study relies on previous research addressing acoustical issues within the vehicles’ interiors. The focus is on the modifications of the BMW E92 sound system to achieve a more realistic soundstage and a distortion-free listening environment. The objective of this work was to evaluate whether the alternative speaker locations installed in infinite baffle technology could provide a better sound quality compared to a factory-installed system. Data was collected through subjective listening and microphone-based measurements via REW software. To fine-tune the system, precise electrical filters, time alignment, and equalizations were applied to ensure an optimal frequency response. The results showed that installing midrange speakers on top of the dashboard significantly improved soundstage height, imaging, and focus. The use of Brax ML8 midbass drivers allowed better dynamics and smoother transitions to the midrange speakers. The installation of 18-inch subwoofers in the trunk enabled the reproduction of frequencies below 20 Hz, providing physical feedback. The alternative layout significantly outperformed the original system, confirming that a well-designed Infinite Baffle system can be a viable option.
Kirjeldus
Bakalaureusetöö
Tehnika ja tehnoloogia õppekaval
Märksõnad
bakalaureusetööd, Infinite Baffle, autoakustika, kõlarite paigutus, helikvaliteet, akustiline optimeerimine