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25-11-2012, 04:56 PM
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#1 |
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Junior Member
Join Date: Nov 2012
Posts: 7
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Skyline
Koja je najvisa difuziona frekvencija ovakvog tipa difuzora? Tacnije, koja je najmanja "dozvoljena" sirina jednog kvadratica (Column width) ispod koje ne bi trebalo da se ide (u smislu da ispod toga vise nije efikasan)? Koristim AcousticCalculator program i u njemu to izgleda ovako http://i47.tinypic.com/2csi1vk.jpg
Last edited by Vinda; 25-11-2012 at 05:16 PM. |
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25-11-2012, 05:48 PM
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#2 |
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Moderator
Join Date: May 2006
Location: Drugdje
Posts: 2,426
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Re: Skyline
To nije Skyline iako tako pi?e nego BBC-jev prototip.
Skyline je trademark poduzeča RPG, a Skyline ima 156 različitih visina! Među PRD (ti gornji so PRD tip) i QRD nema nekih veliih razlika u efikasnosti (ima teoretske) i radije koristi taj kalkulator: http://www.subwoofer-builder.com/qrdude.htm
__________________
We are Dyslexia of Borg. Fusistance is retile. Your ass will be laminated. Nenad Patkovic https://www.facebook.com/NedPat34 https://www.facebook.com/aeracoustics www.aer-acoustics.com http://www.distopiksound.com/ https://mixanalog.com |
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25-11-2012, 06:12 PM
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#3 |
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Junior Member
Join Date: Nov 2012
Posts: 7
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Re: Skyline
Ok, moja greska, ali koji god da je, koliku najmanju sirinu column-a mogu bezbedno da stavim u AcousticCalculator programu?
Last edited by Vinda; 25-11-2012 at 06:14 PM. |
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25-11-2012, 06:41 PM
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#4 |
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Moderator
Join Date: May 2006
Location: Drugdje
Posts: 2,426
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Re: Skyline
... ima? na onom linku ba? sve obrazlo?eno a i kalkulator ti sve računa.
I ovdje ima? napisano oko toga: http://www.rumski.com/forum/showthread.php?t=33893 Debelina "letve"/well-a defini?e koliko visoko difuzuje (min. je priporučeno 25mm) ako je deblji well ni?e difuzuje, a globina defini?e koliko nizko difuzira.
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We are Dyslexia of Borg. Fusistance is retile. Your ass will be laminated. Nenad Patkovic https://www.facebook.com/NedPat34 https://www.facebook.com/aeracoustics www.aer-acoustics.com http://www.distopiksound.com/ https://mixanalog.com |
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26-11-2012, 02:37 AM
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#5 |
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Junior Member
Join Date: Nov 2012
Posts: 7
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Re: Skyline
Aha, znaci minimalno preporuceno je 2.5cm (6880hz). Ok, a sta bi se desilo kada bih stavio, na primer, 2cm (8600hz), jel samo ne bi imalo efekta na frekvencije od 6880hz do 8600hz, ili bi takav difuzor bio zvucno "pogresan" u odnosu na taj od 2.5cm? Zasto je minimalno preporuceno bas 25mm? Da li zato sto visoke frekvencije iznad 6880hz ne mogu efikasno da se difuzuju, ili neki drugi razlog?
Last edited by Vinda; 26-11-2012 at 02:44 AM. |
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26-11-2012, 07:39 AM
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#6 |
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Pro Member
Join Date: Mar 2005
Location: Uzicka Republika
Posts: 6,173
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Re: Skyline
verovatno zato sto se sve te freq veoma lako apsorbuju u prostoru.... ja cak ne bih isao ispod 5cm......kod mene je cak 7cm sirina
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.....Snimam sve (u)zivo ..... 
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26-11-2012, 09:18 AM
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#7 |
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Moderator
Join Date: May 2006
Location: Drugdje
Posts: 2,426
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Re: Skyline
Pa da citiram, što kaže teorija:
"The well width less than the minimum 25mm to avoid viscous losses - Serious viscous losses may be encountered". A i dosta je visoko cca. 7000Hz, treba je uzeti u obazir da difuzor nema naglog cut-off-a pa nudi scattering još nagore.
__________________
We are Dyslexia of Borg. Fusistance is retile. Your ass will be laminated. Nenad Patkovic https://www.facebook.com/NedPat34 https://www.facebook.com/aeracoustics www.aer-acoustics.com http://www.distopiksound.com/ https://mixanalog.com Last edited by NLP; 26-11-2012 at 09:23 AM. |
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26-11-2012, 09:27 AM
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#8 | |
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Moderator
Join Date: Sep 2005
Location: Beograd
Posts: 6,200
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Re: Skyline
Quote:
Takodje imaj u vidu da je sweet spot na zvucnicima vec iznad 5kHz veoma uzak, te treba veliki trud uloziti na pozicioniranje i difuzora i zvucnika, da bi se uopste "gadjali"...
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Email: boggy@myroom-acoustics.com --"We can never see past the choices we don't understand." (Oracle, The Matrix Reloaded) |
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26-11-2012, 09:56 AM
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#9 |
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Junior Member
Join Date: Nov 2012
Posts: 7
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Re: Skyline
Aha, ok, znaci, u sustini, ne bi bilo nikakvog dodatnog efekta (razlike, ne bi se nista dobilo) sa 2cm sirine u odnosu na 2.5cm? Jos jedno pitanje.
Zna li neko mozda (barem otprilike) sirinu Column-a na difuzorima u ovoj prostoriji http://i50.tinypic.com/xepnqq.jpg Hvala na brzim odgovorima Last edited by Vinda; 26-11-2012 at 09:58 AM. |
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26-11-2012, 10:04 AM
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#10 | |
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Moderator
Join Date: Sep 2005
Location: Beograd
Posts: 6,200
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Re: Skyline
Quote:
EDIT: Ovde smo pricali o Blackbird studio C: http://www.rumski.com/forum/showthread.php?t=42755 http://www.rumski.com/forum/showthread.php?t=19211
__________________
Email: boggy@myroom-acoustics.com --"We can never see past the choices we don't understand." (Oracle, The Matrix Reloaded) Last edited by boggy; 26-11-2012 at 10:07 AM. |
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