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Old 7th October 2008, 01:24 AM   #1
SamV is offline SamV  United Kingdom
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Default Best enclosure for these drivers?

Hello everyone,

I have just purchased two Challenger Audio (Fane) ProBass 15s for very little money and I was thinking of making a couple of subs from them or a single dual enclosure.

Their specs are:

300w rms
Freq 30hz - 4khz
Fs 42.5
Qes 0.33
Qms 5.64
Qts 0.31
Le 0.4 mH
Mms 173.5 g
Cms 0.19 mm/N
Bl 114.7
Vas 173.5L
Spl 98.0dB

These would be used in the hall where my studio is where we hold parties with upto 600 people, sometimes with live indie/rock bands. The building is an old townhall so has really thick concrete walls but sadly also a very very high ceiling. What is the best enclosure I could build for these drivers?

Could I also have an option for a simple to build cab that would still perform well? Something that doesn't require a mitre or bent laminates to form a scoop?

Many thanks,
Sam
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Old 7th October 2008, 05:38 AM   #2
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Typo on the Bl value?
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Old 7th October 2008, 12:25 PM   #3
djk is offline djk
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|40 Hz Tapped Horn

Def_Const |Horn Dimensions

{
a1 = 500e-4; |Area at throat (cm^2)
a2 = 850e-4; |Area at rear of driver (cm^2)
a3 = 2900e-4; |Area at front of driver (cm^2)
a4 = 3000e-4; |Area at mouth (cm^2)
l1 = 15e-2; |Distance from throat to rear of driver (cm)
l2 = 205e-2; |Line distance from rear of driver to front of driver (cm)
l3 = 25e-2; |Distance from front of driver to mouth (cm)
}

Def_Driver 'Dr1'

| Challenger Audio (Fane) ProBass 15
Sd=856.3cm2
fs=42.5Hz
Qes=0.33
Qms=5.64
Vas=173.5L
Re=5.6ohm
Le=2mH

system 'S1'

Driver Def='Dr1' Node=1=0=3=4
Waveguide 'W1' Node=2=3 STh={a1} SMo={a2} Len={l1} Conical
Waveguide 'W2' Node=3=4 STh={a2} SMo={a3} Len={l2} Conical
Horn 'H1' Node=4 STh={a3} SMo={a4} Len={l3} Conical

Click the image to open in full size.
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Old 7th October 2008, 12:37 PM   #4
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Look into QB5 system design in the loudspeaker articles on sound.au.com
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Old 7th October 2008, 12:42 PM   #5
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I took a guess at the Re, Sd, and added some inductance to smooth out the response. About 2dB from about 38hz to 150hz or so, one box shown.

Two stacked would be smoother and more efficient. A generic TH design with one fold could be constructed, about 49.5" high, 23" wide, 27.5" deep. No angle cuts required on the plywood.
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Old 7th October 2008, 01:24 PM   #6
djk is offline djk
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"Look into QB5 system design in the loudspeaker articles on sound.au.com"

http://sound.westhost.com/qb5align.htm

Not the best choice for this driver.

With the Qts of the Fane you have two choices there, 6dB of bass boost at 42hz to make it flat to 42hz, or -3dB at 80hz. Without the boost it will be less than 90dB/W/1M at 42hz vs the TH being 104dB at the same frequency. The only thing that alignment gives is a small box, and efficiency is proportional to size. For a Qts of .312 the alignment is essentially an SBB4 and with the filter/EQ it becomes a B6, and virtually identical to the EV TL606 design from 1974.

http://archives.telex.com/archives/E...rs%20Plans.pdf
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Old 7th October 2008, 02:55 PM   #7
SamV is offline SamV  United Kingdom
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The BL isn't a type, several sites have the same figure. Thanks for the ideas guys
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Old 7th October 2008, 11:11 PM   #8
djk is offline djk
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"several sites have the same figure"

I guess if you repeat something that is wrong enough times, it becomes correct?
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Old 7th October 2008, 11:53 PM   #9
SamV is offline SamV  United Kingdom
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Well there was no spec sheets with the drivers
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Old 8th October 2008, 02:32 AM   #10
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Might be a units thing. I did a cursory search and found nothing additional.

I've looked at a lot of woofers, but I have never seen a Bl figure with three digits ahead of the decimal point - which is why I asked.
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