huge port

78nova
10+ year member

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i am going to buy the subs in my sig. and make a box for them also how it shows in my sig. but i was thinking if i ever happen to run into a competition or something i could make a huge ass box with like 9 cubic ft. and a HUGE slot port, but i dont kno how big i should make it, i want it to be huge and be able to hit high db's how big should it be if i am thinking of competing

 

kingpin_jeffie
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i need a vacation...
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Erie, PA
Well it all depends on your install and your specific vehicle. General rule of thumb is if you want something that will put out mad spl then look into tuning your box higher. preferably near the resonant freq of your vehicle.

Also a helpful resource for determining port dimensions and tuning is winisd, however do not put too much faith into the freq response graphs the program gives you, as they will become radicaly different once in car. Just use it as a reference for tuning.

 
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Pretty sure this is way beyond the scope of anything anybody here deals with. You may have some luck over at DIYaudio.com where there's some electronics guys who post.
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Yeah, saw that too, was like ??? wtf! They do know there stuff, I usually just roll with it!
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You could try to make the port longer, but there might be other reasons with the box won't extend lower, or even the sub. You'd have to reverse engineer the net airspace and tuning of the box and...
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While that program is pretty neat, it assumes you know the values. I was just recapping the numbers you provided. RS recommends the following Ported enclosure 1.75ft-2.5ft tuned @35hertz with...
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Whoa, that will be one skinny port. The width of the back wall ports will be 1.08" wide (27.5mm), but the front port will be shared by 2 subs so it will be 2.16" wide (55mm) Had read it wrong.
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