Small Line Array Design

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   so, following snowflakes suggestion of constant beamwidth, at first i did not see something one would replicate in small scale
http://www.xlrtechs.com/dbkeele.com/CBT.php

but then, on the page above, i saw that jbl has a series of loudspeakers that uses (if i got that right) electronic delay instead of acoustical (in form of building an arc shaped speaker), with small speaker boxes consisting of not more speakers than csijo has

https://jblpro.com/product_families/cbt-series-passive-controlled-coverage-columns

in the past, i have used diy amp boards with dsp (tinysine, wondom), which could be used to build a small speaker box of vertical aligned drivers. a board with 4 channels could run a speaker with 7 drivers (pattern 4 - 3 - 2 - 1 - 2 - 3 - 4) and delay the input signal according to the position in the array.

asking the forum, is this something that could work, or have i smoked the wrong tree?

cheers! J.

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julius111 Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 04 September 2021 Location: cologne Status: Offline Points: 57	Post Options Post Reply Quote julius111 Report Post Thanks(0) Quote Reply Posted: 18 July 2024 at 8:28pm
	so, following snowflakes suggestion of constant beamwidth, at first i did not see something one would replicate in small scale http://www.xlrtechs.com/dbkeele.com/CBT.php but then, on the page above, i saw that jbl has a series of loudspeakers that uses (if i got that right) electronic delay instead of acoustical (in form of building an arc shaped speaker), with small speaker boxes consisting of not more speakers than csijo has https://jblpro.com/product_families/cbt-series-passive-controlled-coverage-columns in the past, i have used diy amp boards with dsp (tinysine, wondom), which could be used to build a small speaker box of vertical aligned drivers. a board with 4 channels could run a speaker with 7 drivers (pattern 4 - 3 - 2 - 1 - 2 - 3 - 4) and delay the input signal according to the position in the array. asking the forum, is this something that could work, or have i smoked the wrong tree? cheers! J.

Elliot Thompson Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 02 April 2004 Location: United States Status: Offline Points: 5365	Post Options Post Reply Quote Elliot Thompson Report Post Thanks(0) Quote Reply Posted: 19 July 2024 at 4:10am
	One of things that many do is load as many loudspeakers remotely feasible on an amplifier and, crank it up. Using one amplifier for each loudspeaker allows you to accomplish more creativity in terms of performance. It is a more costly method that the cheapskate mentality of many sound professionals refuse to do. This in turn, will lead to a lot reasons not to do it. However, you must follow your own path and choose what is best for your requirements. Your method would work! Best Regards,
	Elliot Thompson

julius111 Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 04 September 2021 Location: cologne Status: Offline Points: 57	Post Options Post Reply Quote julius111 Report Post Thanks(0) Quote Reply Posted: 20 July 2024 at 5:29am
	thanks for your feedback! while reading on other subjects (i have a lot of free time a.t.m.), i came across a link to a software which would allow for simulating the arrangement of speakers. it even mentions CBT array in the manual: https://kimmosaunisto.net/Software/VituixCAD/VituixCAD_help_20.html#Driver_layout might be worth trying, as it‘s donation-based software. cheers, Julius.

fatfreddiescat Members Profile Send Private Message Find Members Posts Add to Buddy List Young Croc Joined: 15 October 2010 Location: N.E.Wales Status: Offline Points: 1128	Post Options Post Reply Quote fatfreddiescat Report Post Thanks(0) Quote Reply Posted: 20 July 2024 at 9:34am
	Vituixcad is an awesome peice of software and would be invaluable for a project such as yours, lots of info on diyaudio in regards to small line arrays as well as the author of Vituixcad being active on there.

Elliot Thompson Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 02 April 2004 Location: United States Status: Offline Points: 5365	Post Options Post Reply Quote Elliot Thompson Report Post Thanks(0) Quote Reply Posted: 20 July 2024 at 12:09pm
	As VituixCAD allows you to import numerous measured results from a wide variety of programs, the end results will be more accurate than, focusing solely on a static simulation program. Definitely more next level of design that many are not doing when building a loudspeaker system. Best Regards,
	Elliot Thompson

csijo Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 28 March 2005 Location: Venezuela Status: Offline Points: 107	Post Options Post Reply Quote csijo Report Post Thanks(0) Quote Reply Posted: 14 August 2024 at 10:39am
	Queridos amigos de Speakersplans.com, Quiero expresar mi más sincero agradecimiento a todos ustedes por su invaluable ayuda y la información que me brindaron. Su conocimiento y disposición para aclarar mis dudas han sido fundamentales para mi proyecto. Desde aquellos que compartieron su experiencia técnica hasta quienes me proporcionaron enlaces útiles y consejos prácticos, cada uno de sus aportes ha sido de gran valor. Estoy realmente impresionado por la amabilidad y el profesionalismo que caracteriza a esta comunidad. Gracias a sus sugerencias y orientaciones, ahora tengo una comprensión mucho más clara y sólida de los temas que me preocupaban. No podría haber avanzado sin su apoyo. Ahora me preocupa otro tema, el diseño del filtro de frecuencias crossover para este tipo de altavoz y estaba pensando en diseñar y construir un filtro pasivo divisor de frecuencias de 24 dB por octava (4to orden) con una sola vía para un rango de frecuencias entre 150 Hz y 20 kHz para altavoces de 250 vatios RMS con impedancias entre 4 y 8 ohmios, creo que ese tipo de filtro normalmente no se vende y me tocara fabricarlo y he estado investigando un poco y he encontrado esto Para el Filtro Pasa-Alto (HPF) a 150 Hz: Para una impedancia nominal de 4 ohmios: C1 = 265 μF y L1= 4,24 mH Para una impedancia nominal de 8 ohmios: C1= 132 μF y L1= 8,48 mH Para el Filtro Pasa-Bajo (LPF) a 20 kHz: Para una impedancia nominal de 4 ohmios: do2= 0,2 μF y L2= 15,9 μH Para una impedancia nominal de 8 ohmios: C2= 0,1 μF y L2= 31.8 μH Ahora el tema seria donde conseguir sobre todas las bobinas y condensadores con esos valores aquí en españa. Les dejo unas fotitos de lo que he ido adelantando
	Audio Fanatics, Bass lover

julius111 Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 04 September 2021 Location: cologne Status: Offline Points: 57	Post Options Post Reply Quote julius111 Report Post Thanks(0) Quote Reply Posted: 15 August 2024 at 7:48pm
	hey, great to hear you are making good progress! the filter you mention, i think it is a 12dB/oct circuit? i use this tool, it is in german but you might be able to still use it https://www.jobst-audio.de/tool/frequenzweiche/frequenzweichen-rechner it is basic though, there is a whole art to making analog crossovers. my knowledge of electronics is limited, i now use dsp whenever i can.