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Old 30th November 2003, 10:52 AM   #1
darkm4n is offline darkm4n  Romania
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Default All about Sub's , Good sub design , 12" driver .

Hi ,

I'am intersted in building 2 good subwoofer with a 12" drivers , the driver specification's :

Size: 12"
Magnet weight: 60oz
Voice Coil: 2.5"
Max.Power: 300W
Frequency Response: 25-4KHz
Sensitivity(1W/1M): 90dB

I found those driver cheap , i'am not interested in a Hifi Subwoofer , maybe a P.A. type .

Horn or bandpass maybe a good idee . Also i want somethink with a good kick . Feel free to post here pic's with scheme for subwoofer's .

Thank's very much !
Mihai .
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Old 3rd December 2003, 12:18 AM   #2
Bull is offline Bull  United Kingdom
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The driver u want to use is a very cheap car subwoofer,which might be ok in a bandpass enclosure.
The wattage reading on that subwoofer is very misleading
[300w max],which probably the rms wattage of that sub is 150w-100w rms.
25hz for a very cheap unknown make car subwoofer,another manufactor exaggeration or it's at -12 db.
So without other parameters like X max,BL product,Peak displacement Volume,it would be trial and error to see how it would work in a bandpass. under the pa section has plans of a 12 inch reflex bass bin to make.
Use 3/4 inch particle board to build the enclosure with in case the driver sounds horrible in that size box then at least u won't have wasted much money on buying expensive materials like birch plywood.
Line the back panel of the cabinet with wadding[ polyester stuffing,like used in pillows, is cheaper and much safer than fiberglass wadding].Glue it and staple it/machine tack it to the cabinet from inside to stop the wadding from flapping.
Use thick wire in the cabinet anything between 12 gauge-16 gauge is ok.

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Old 3rd December 2003, 12:24 AM   #3
Bull is offline Bull  United Kingdom
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The enclosure volume of this 12 inch bass bin is 50 litres at look under the pa gear section,then click on 'Easy bass cab' 10/12/15/18 inch bass bin plans.
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Old 3rd December 2003, 03:44 AM   #4
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You can Measure Fs and calculate Qes and Qms which is something...

Because Fs/Qes=Efficiency bandwidth product to choose between ported or sealed...

you could try 50litres each tuned to 30hz , you can shorten the port or seal it off if it sounds better that way.

next time if possible buy a woofer that has t/s specifications

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