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Old 8th November 2007, 10:53 AM   #11
djk is offline djk
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This is the way I build my manifold boxes, not that much wasted space.

Click the image to open in full size.

With a pair of 15s it's only about 1 cu ft, the net interior volume is on the order of 8 cu ft, port is tuned to 31hz (low B on a five-string bass).
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Old 11th December 2007, 06:18 AM   #12
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Default Just about ready

Been ocupied by other things and my job
but now Im ready to build these babies

Im Going to be using Beyma 18G50 Speakers

here are the parameters:

Brand Beyma
Model 18 G50
Description Die cast aluminium basket. Paper cone. Plasticised cloth surround. Edgewound alum. flat wire voicce coil.
Range / type woofer
Typical use PA
Recomended enclosure Box size 80 / 200 Liters
Series PRO LF
Manufacturer Beyma
Order nr
Production status Active 2003
Nom. diamerer [inch] 18
Vas [Liters] 212
Qts 0,325
Qes 0,334
Qms 12,05
Fs [Hz] 40
Sensitivity [dB] 98
Max Power [W] 800
Power definition W AES
Lower freq [Hz] 25
Upper freq [Hz] 1500
Rec. Filter freq [Hz]
xmax [mm] 9
Moving mass [g] 170
Disp area [m2] 0,132
Disp Vol [cm3] 1,18
xdamage [mm] 40
Air gap [mm] 11
Coil height [mm] 25
Coil diameter [mm] 114
Cms [mm/N] 93
Rms [N*s/m] 3,54
Magnet weight [gr]
Magnet height [mm]
Magnet diameter [mm]
Magnet material - Ferrite
Re [ohm] 6,1
Z [ohm] 8
L [mH] 2
Bl [Tm] 28,8
Magnetic flux [Wb]
Flux density [T]
Outer diam. [mm] 460
Bolt circle [mm] 438
Nr of bolts [Nr]
Cutout [mm] 415
Weight [Kg] 14
Height [mm]
Depth [mm] 210
Driver volume [Liters] 13
Frequency SPL / Z

would these make good drivers for this enclosure?

Could someone please give me the dimensions off all
the boards needed to build this enclosure? (I find the plans confusing)

Thanks In Advance.
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Old 12th December 2007, 08:59 AM   #13
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Old 12th December 2007, 09:01 AM   #14
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Old 12th December 2007, 09:02 AM   #15
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Old 12th December 2007, 09:06 AM   #16
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Default Now the Problem

When I Try cal culate the panel that I have shaded red in the attached pic

I get 572mm - 240 -240
wich gives me 92mm
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Old 12th December 2007, 04:05 PM   #17
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You left out the thickness of the 4 pieces of wood, 92 is to big.
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Old 12th December 2007, 07:40 PM   #18
bjorno is offline bjorno  Sweden
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Hi,

FYI, The manifold and the suggested Beyma 18 G50 drivers using the layout of djk:s posted picture (post #11) simulated in a 310 Liter (red color plots) ported box, drivers on the front baffle, picture 1(2) to 2(2).

Using the same box but reducing the internal volume to 250 L (black colour plots) where the volume occupied by the manifold and drivers is arbitrarily set to be a loss of 60 L.

At last: A probable impact on the front side driver output from the slot and baffle load, marked with blue colour and blue plot using a separate simulation from MJK: s BLH_Sections_3_21_07[1] program sheet.

b

1(2)
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Old 12th December 2007, 07:41 PM   #19
bjorno is offline bjorno  Sweden
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2(2)
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Old 13th December 2007, 04:44 AM   #20
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Thanks 4 the reply bjono

k twister

so that will be 572mm - ( (18x4) + (240X2) )
wich gives me 572mm - ( 72 + 480)
then 572mm - 552mm
wich equals 20mm

but then no 18' speaker has a depth of20mm

the 18g50 im going to use is 210mm

or are the dimensions in inches?

Thanks in advance...
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