Does sub enclosure shape matter

[sweety 10+ year member]

Hi guy's does enclosure shape matter ? The manufactuers of my sub (JBL) recommend a wedge shaped ported enclosure with a round port but if the sub was to be fitted to a rectangular enclosure with a round port would I suffer any ill effects with the sound ie cancellation issues ?

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[jrdnhsnbrg 10+ year member]

If the box is within the specs I don't see why it wouldn't work but I by no means am a pro so I'd wait and see what a pro says. One should chime in soon, knowing this forum. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[sweety 10+ year member]

Cheers & look forwards to hearing others views fitted the sub in it's sealed box into my truck today & it's no where near as loud as I hoped even tho it's getting 250RMS (50W more than the sub is rated) so it's going to need a ported box. Had the 12" version sealed which they say is best for that sub but was never happy with it so gave it to my Son & built a ported box for it as thats what he wanted & wow what a difference

 

[Ronny 10+ year member]

You'll be just fine utilizing a rectangular shaped enclosure. Just to be sure about your build, what are your plans for the enclosure?

 

[jrdnhsnbrg 10+ year member]

Any sub will/should be louder in a ported enclosure, I'm pretty sure the shape as long as it's nothing extremely crazy shouldn't affect the sub.

 

[hispls 5,000+ posts]

Unless you took "shape" to the extreme where the width between internal walls and the port became too crowded any difference in shape should be inaudible.

 

[sweety 10+ year member]

The box will be 1.41ft^3 with a 2" wide x 4" long port which JBL has said to use which should tune it to 33Hz a rough idea is for it to be 18 3/4" long x 15" high & 12" depth. I'm planing on mounting the amp onto the rear of the box or on the end as I need to be able to remove it all when carrying loads or when we go away camping

What got me wondering about this is that JBL's plans are a rectangular box for sealed but wedged for ported. With a 12" depth i'll have 4 3/4" behind the sub magnet & 6 3/4" air gap behind the port would that be enough room

Cheers for the help guy's as you've been 100% more helpful that the UK forum i'm on

 

[Dirtrider4eva 10+ year member]

welll...technically shape can affect an enclosures response.. the smoother the edges and less resistance the more output and less port noise. but by a substancial amount? eh no.

 

[Ronny 10+ year member]

The box will be 1.41ft^3 with a 2" wide x 4" long port which JBL has said to use which should tune it to 33Hz a rough idea is for it to be 18 3/4" long x 15" high & 12" depth. I'm planing on mounting the amp onto the rear of the box or on the end as I need to be able to remove it all when carrying loads or when we go away campingWhat got me wondering about this is that JBL's plans are a rectangular box for sealed but wedged for ported. With a 12" depth i'll have 4 3/4" behind the sub magnet & 6 3/4" air gap behind the port would that be enough room

Cheers for the help guy's as you've been 100% more helpful that the UK forum i'm on

One more time? What will the orientation for this enclosure be? As in where/how will the woofer fire? And the vent? You certainly want room between the rear of the driver and vent's internal opening as to thwart off any "unloading."

 

[sweety 10+ year member]

The sub & port will both be aimed at the rear of the trunk (sounds funny saying that as we call it a boot in the UK lol) & there will be 5 1/4" clearance not the 4 3/4" I stated before (bad maths)

 

[sweety 10+ year member]

Just had a measure up & could do a slot ported box but not sure if my maths is correct so was wondering if someone could check it for me please a box 20.75 x 14 x 14" with a 1.5" port 28" long made from 3/4" MDF would give a volume of 1.41ft^3 & tune the box to 33Hz

 

[sweety 10+ year member]

Any chance someone could confirm if my maths is right for the above sized box please

 

[Slo_Ride 5,000+ posts]

Any chance someone could confirm if my maths is right for the above sized box please

port is 28" long 1.5" wide, how tall? 14"?

 

[sweety 10+ year member]

The port would be 12.5" high as I put up the outside measurements of the box using 3/4" MDF

 

[sweety 10+ year member]

No one know if i've worked it out right //content.invisioncic.com/y282845/emoticons/banghead.gif.8606515f668c74f6de0281deb475b6fd.gif might just have to build it & hope for the best:uhoh: