Hola a todos,
Os dejo un link que me ha parecido muy interesnate: supongo que ya conocereis la página ( es un constructor bastante activo y conocido en el mundillo DIY) pero trasteando por sus artículos me he encontrado esto.
Llega a conclusiones de lo mas oportunas y aprovechables con alineaciones BR no tradicionales, sobre todo para los que, como yo, no podemos hacernos cajas tamaño Andreu.
Luismax: tu que tienes mucha experiencia alineando BR,midiendo sus impedancias y oyendo sus resultados no sé lo que te parecerá.
Saludos
http://www.geocities.com/cc00541/Sealed_v_Vented.html
Reflex no tan grandes
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CIBERPROTON
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Os dejo un link a una caja BR con una alineación con un rolloff de 2º orden (similar a una caja cerrada). La diferencia es que aquí no se ha limitado el tamaño propio de la caja BR de hecho para 2 RS225 cubican 100 litros.
http://www.geocities.com/cc00541/Statements_2.html
http://www.geocities.com/cc00541/Statements_2.html
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CIBERPROTON
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Siguiendo con mis "reflex"-inoes acerca de BR con otras alineaciones me ha llamado la atención los comentarios de Zaph con motivo de las presentacion de sus kits en madisound.
En la descripción de los sistemas que ha diseñado (en este link http://www.zaphaudio.com/ZA5/) nos dice lo siguiente:
"Choosing a tuning is a fine balance of power handling, extension and realistic in-room usage. Many people choose a tuning based on the lowest anechoic F3 possible, without considering the effects of the primary series inductance and the baffle step. This is shown as the basic uncompensated tuning above. You can model and design by an anechoic and unfiltered curve, but it's generally not realistic except for an infinite baffle installation with an active crossover. Considering where the average primary room node falls, I usually go for a gradual low end rolloff to help the in-room curve avoid boomy one-note bass. After the series inductance and baffle step is added to the model, I reach my goals. The full simulation above what I arrived at. The real measurements match pretty well."
lo cual es muy parecido a las indicaciones de curtz, es decir sistonización de reflex a frecuencias mas bajas y un volumen menor que las que te dan un F3 optimo (QB3 en WinISD), Zaph indica que la integración con la sala es mejor con una pendiente menos abrupta (sitonización mas grave) y el resultado no mejora gran cosa a mayor volumen (con lo que se queda con un volumen cercano al optimo para caja cerrada).
Interesante.
Chao
En la descripción de los sistemas que ha diseñado (en este link http://www.zaphaudio.com/ZA5/) nos dice lo siguiente:
"Choosing a tuning is a fine balance of power handling, extension and realistic in-room usage. Many people choose a tuning based on the lowest anechoic F3 possible, without considering the effects of the primary series inductance and the baffle step. This is shown as the basic uncompensated tuning above. You can model and design by an anechoic and unfiltered curve, but it's generally not realistic except for an infinite baffle installation with an active crossover. Considering where the average primary room node falls, I usually go for a gradual low end rolloff to help the in-room curve avoid boomy one-note bass. After the series inductance and baffle step is added to the model, I reach my goals. The full simulation above what I arrived at. The real measurements match pretty well."
lo cual es muy parecido a las indicaciones de curtz, es decir sistonización de reflex a frecuencias mas bajas y un volumen menor que las que te dan un F3 optimo (QB3 en WinISD), Zaph indica que la integración con la sala es mejor con una pendiente menos abrupta (sitonización mas grave) y el resultado no mejora gran cosa a mayor volumen (con lo que se queda con un volumen cercano al optimo para caja cerrada).
Interesante.
Chao
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Cuando uno va parece que Zaph ya hubiese ido y vuelto dos veces:
Mas sobre este asunto en sus desing mantras que están en su pagina desde que la conozco.
"Tuning a vented box is important enough that it needs it's own section here.
For vented boxes, the box size and tuning frequency that I select is rarely what a box modeling program might consider optimum. For folks new to DIY speakerbuilding, the first software tool they often use is a freeware box modeling program like WinISD. The bad news is that what WinISD considers optimum is merely the the alignment that results in the lowest F3 in anechoic conditions. These programs don't consider room response, power handling, group delay or any of a number of other issues when they pop out a "optimum" box size and tuning frequency. So don't email me saying "Why did you do that when WinISD says this is optimum?" The answer is: Because I'm smarter than WinISD.
The vented alignment I typically use doesn't have a name. I'm sure I didn't invent it, but I haven't seen much out there to describe it. Normally, I'll tune lower to get a more gradual rolloff that works better with room response and puts power handing where I need it. It's basically a type of tuning that is a combination between sealed and vented alignments. Note that this is not an Extended Bass Shelf (EBS) tuning. That kind of tuning implies an oversized enclosure volume, with a dip above the tuning frequency. You get the lowest anechoic F3 with that configuration, but in a real room you get an overbearing one-note bass at the tuning frequency, a huge midbass dip, and crappy power handling. "
Desde luego nuestros compañeros de afición del otro lado del charco se lo tienen currado, no conozco en Europa un foro ó constructores como pueden ser diyaudio.com ó http://www.htguide.com/forum, con gente como Zaph ó jhon mars. De hecho el mejor foro en europa que yo conozca es ESTE en el que nos leemos.
Saludos
Mas sobre este asunto en sus desing mantras que están en su pagina desde que la conozco.
"Tuning a vented box is important enough that it needs it's own section here.
For vented boxes, the box size and tuning frequency that I select is rarely what a box modeling program might consider optimum. For folks new to DIY speakerbuilding, the first software tool they often use is a freeware box modeling program like WinISD. The bad news is that what WinISD considers optimum is merely the the alignment that results in the lowest F3 in anechoic conditions. These programs don't consider room response, power handling, group delay or any of a number of other issues when they pop out a "optimum" box size and tuning frequency. So don't email me saying "Why did you do that when WinISD says this is optimum?" The answer is: Because I'm smarter than WinISD.
The vented alignment I typically use doesn't have a name. I'm sure I didn't invent it, but I haven't seen much out there to describe it. Normally, I'll tune lower to get a more gradual rolloff that works better with room response and puts power handing where I need it. It's basically a type of tuning that is a combination between sealed and vented alignments. Note that this is not an Extended Bass Shelf (EBS) tuning. That kind of tuning implies an oversized enclosure volume, with a dip above the tuning frequency. You get the lowest anechoic F3 with that configuration, but in a real room you get an overbearing one-note bass at the tuning frequency, a huge midbass dip, and crappy power handling. "
Desde luego nuestros compañeros de afición del otro lado del charco se lo tienen currado, no conozco en Europa un foro ó constructores como pueden ser diyaudio.com ó http://www.htguide.com/forum, con gente como Zaph ó jhon mars. De hecho el mejor foro en europa que yo conozca es ESTE en el que nos leemos.
Saludos
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