Hi daryl'
The sub that you're attempting to put together (just judging by the photo), won't have enough "structural integrity" to calculate the amount of air (in cuft) behind the driver to decide or predict just how it will behave in the end product.
Before you can use a "duct tube" or a "port", you will need to completely seal off the driver's enclosure (box), to prevent air leaks from behind the sub. The idea is to control the driver #1), in order to protect it from self damage or over excursion.
And #2), to assist it in operating in the frequency pass-band for which it was intended. There are some really good books on the subject. There's "Sound check" or "Live sound reinforcement" by Hal Leonard publishing. Sound Check, Book - Hal Leonard Online. Perhaps you should consider using a small speaker box to mount the speaker in; it will likely turn out much better in the end. Hope this helps!
rigtec, cheers
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thanks for the reply rigtec .the spare wheel is still there thats bolted to the car making a air tight seal. and the MDF witch holds the sub is bolted to the wheel agen making a air tight seal sitting on the rubber tyre .in theroy its in a enclosure the depth and width of the tyre its a full size wheel not a space saver .... i was unshure abut using that sub as i had bought it with a box and it was auful its been sat in my loft for 3 years its the smallest one i have as space was a issue ..it peforms grate my head unit is on -8 and my amps on halfway and its still loud need to turn the amp down more..had a good little test on the school run and im more than pleased with my creation😀😀.. i personly dont fink it needs a reflex tube ...thanks daryl
Sealed subwoofers are a better match to a car's natural bass boost at low frequencies, known as "cabin gain" or "transfer function". You could probably get more punch at certain frequencies by porting that box, if you had the T-S parameters and knew to volume of the enclosure, but it likely wouldn't sound as good, and would sacrifice deep bass.
how would i go about working out the T-S parameters or volume of the enclosure thanks guys .and then would i no witch size port to buy if one is needed
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Would you be interested in posting this install as the first in the "sticky photo thread" for the forum?
http://www.diyaudio.com/forums/car-audio/249195-system-pictures-description.html
http://www.diyaudio.com/forums/car-audio/249195-system-pictures-description.html
No, just drop the picture there with a note.
PERSONAL OBSERVATION:
I think your enclosure is genius! Zero vehicle room taken up... Excellent example of DIY and ingenuity!!
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