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Old 18th January 2011, 04:56 AM   #1
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Default help with bandpass dimensions

Hy guys can you help me with the dimension for a 4th order bandpass enclosure.
And what is the correct cutoff frequency, i`m thinking at 200hz?

Monacor - Romania
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Old 18th January 2011, 09:54 AM   #2
palesha is offline palesha  India
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Quote:
Originally Posted by Matei Alin View Post
Hy guys can you help me with the dimension for a 4th order bandpass enclosure.
And what is the correct cutoff frequency, i`m thinking at 200hz?

Monacor - Romania

Will need the driver specifications to go ahead.
If u want 200 hz cut off on higher side ( i assume) then the lower side cutoff will be from 80~100 hz normally.
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Old 18th January 2011, 12:35 PM   #3
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the driver specification are in the link. but i`ll post them here to. I`m refering at the cutoff frequency for the subwoofer.
It`s dual coil
Impedance (Z)2 x 8Ω
Resonant frequency (fs)23Hz
Max. frequency rangef3-2,000Hz
Rec. crossover freq. (fmax.)1,000Hz
Music power2 x 250WMAX
Power rating (P)2 x 120WRMS
SPL (1W/1m)91dB
Suspension compl. (Cms)0.85mm/N
Moving mass (Mms)68g
Mech. resistance (Rms)3.2kg/s
Mech. Q factor (Qms)3.03
Electr. Q factor (Qes)0.26
Total Q factor (Qts)0.24
Equivalent volume (Vas)290 l
DC resistance (Re)2 x 6.3Ω/3.2Ω
Voice coil induct. (Le)2 x 1.0mH/1.0mH
Voice coil diameter 50mm
Voice coil former aluminium
Voice coil winding height16mm
Air gap height8mm
Linear excursion (XMAX)±4mm
Eff. cone area (Sd)495cm2
Volume displacement (Vd)198cm3
Force factor (BxL)10.3Tm
Reference efficiency (No)1.3%
Magnet diameter156mm
Magnet weight1.4kg
Mounting cutoutŲ 280mm
Mounting depth140mm
DimensionsŲ 306mm
Weight4.0kg
Rec. net cabinet volume
Closed38 l
Bass-reflex72 l

Last edited by Matei Alin; 18th January 2011 at 12:57 PM. Reason: bad gramar
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Old 18th January 2011, 01:18 PM   #4
Thawach is offline Thawach  Thailand
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quickly to simulate and still don't see any details i post the link to download cab design. Matei Alin high freq cut off about 100-150 is better than 200 hz

monacor.rar
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Old 18th January 2011, 01:35 PM   #5
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The size isn`t a issue for me. And the port diameter is? Tnx (is this the best size) in bass box 6 it give me v1= 30l v2 = 27l.

What about this
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Last edited by Matei Alin; 18th January 2011 at 01:47 PM.
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Old 18th January 2011, 07:54 PM   #6
Thawach is offline Thawach  Thailand
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i don't sure the bass box 6 count the length of port with the two flare ends. about the flare port design,u can read this website they also have flare port calc to download.

Port Flares
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Old 18th January 2011, 10:46 PM   #7
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uokey, tnx, i`ll build this , tnx a lot :*
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