Dilema

[rinaldoparaipan]

Sal'tare la toti forumistii!Am o dilema legata de un dif. Visaton W200 8 Ohm:Rated power 50 WMaximum power 80 WNominal impedance Z 8 OhmFrequency response fu?8000 Hz(fu: Lower cut-off frequency depending on cabinet) .Mean sound pressure level 88 dB (1 W/1 m)Angle of sound emmision 49°/4000 HzMaximum cone displacement +/?10 mmResonance frequency fs 46 HzMagnetic induction 1,0 TMagnetic flux 400 ?WbHeight of front pole-plate 5 mmVoice coil diameter 25 mmHeight of winding 9 mmCutout diameter 185 mmNet weight 1,045 kgD.C. resistance Rdc 6,8 OhmMechanical Q factor Qms 2,82Electrical Q factor Qes 0,80Total Q factor Qts 0,62Equivalent volume Vas 51 lEffective piston area Sd 207 cm?Dynamically moved mass Mms 14 gForce factor Bxl 5,6 TmInductance of the voice coil L 0,9 mHAm facut o simulare cu Win ISD si mi-a iesit o cutie cu volumul de 359 l. L-am bagat provizoriu intr-o boxa mai veche cu volum interior de 16 l si se aude destul de bine.Problema este ca 16l mi se pare totusi putin pt 20cm diametru la membrana , iar 359l enorm.Cat ar fi totusi volumul optim?Astept sfaturi de la specialisti;vine ziua mea si vreau sa la bag "la forjat"Multam de ajutor.

[zal]

''Equivalent volume Vas 51 l''?sta ar fi minimul, la cutie închis?.

[rinaldoparaipan]

''Equivalent volume Vas 51 l''?sta ar fi minimul, la cutie închis?.

Saru-mana.Peste 51 l presupun ca duce bassu mai jos.Exista un optim?Intreb astea fiindca cu Win ISD mi-am cam prins urechile.

[zal]

Mai jos nu se duce, se poate accentua, dar numai în cutie bas-reflex, mai greu de calculat.Folose?te volumul dat de produc?tor ptr cutie închis?, va suna foarte bine.

[chorchy]

30 de litri sealed

[CBI]

Folose?te volumul dat de produc?tor ptr cutie închis?, va suna foarte bine.

"Equivalent volume of compliance", this is a volume of air whose compliance is the same as a driver's acoustical compliance Cms (q.v.), in cubic meters.

"Vas represents the volume of air that when compressed to one cubic meter exerts the same force as the compliance (Cms) of the suspension in a particular speaker

 

deci atentie Zal,nu este volumul dat de producator,este doar un parametru ,unul f f important de altfel.Minim 50L pt 8" intr-o cutie inchisa este totusi enorm

 

deci,rinaldoparaipan,ai doar o bucata? ce vrei sa faci cu el,subwoofer? e cam slabutz pt asa ceva,are frecv de rezonanta cam maricica,plus ca si xmax este mic,de numai 2mm

 

"20 cm (8") woofer with very good price/performance ratio. Suitable for simple 2-way speakers and car rear tray systems. Especially suited as replacement driver for many HiFi speakers."

[rinaldoparaipan]

M-am grabit sa postez si nu am dat toate informatiile:

Am doua Visaton W200 si doua tweeter SC 10 N

Technical Data:

Nominal power handling with high pass 100 W (12 dB/Okt.; 4000 Hz)

Peak power handling with high pass 150 W (12 dB/Okt.; 4000 Hz)

Nominal impedance Z 8 Ohm

Frequency response 1000?20000 Hz

Mean sound pressure level 90 dB (1 W/1 m)

Angle of sound emmision 109°/8000 Hz

Resonance frequency fs 1700 Hz

Magnetic induction 1,3 T

Magnetic flux 210 ?Wb

Height of front pole-plate 2,5 mm

Voice coil diameter 25 mm

Height of winding 2 mm

Cutout diameter 85 mm

Net weight 0,55 kg

D.C. resistance Rdc 6,9 Ohm

Effective piston area Sd 5 cm?

Dynamically moved mass Mms 0,1 g

Inductance of the voice coil L 0,04 mH

cu care vreau sa fac doua fullrange inchise.

Deci, dupa o jumatate de zi de cautari pe net, calcule si simulari am ajuns la urmatoarele concluzii:

-159 litri conform win isd-exclus.

-conform programului asta http://www.kbapps.com/audio/speakerdesign/calculators/Default.htm ,rezulta volumul incintei de 108 l. Am facut o schita 3D in Autocad si arata rau de tot, parca e o cutie cu difuzoare, nu boxa.(distantele stg-dreapta-jos de la woofer la margini sunt prea mari).

-Am redus volumul interior la cca. 68 litri si rezulta o cutie cu dimensiunile exterioare 640x400x350 mm, care arata mai bine proportionata in raport cu difuzoarele.

Vazand ultimile raspunsuri, si acesti 68 litri mi se par mult.

Astept sfaturi in continuare.

[papyreloaded]

30 l inchisa cu fonoabsorbant

[rinaldoparaipan]

Gata, m-am hotarat, inchisa de 30 litri o fac.Merg sa comand placile.