woofer mounted upside down?

Question

i got the answer for my previous question foe woofer box specs..now i want to kno if i want to install my 10"jlw3v2 upside down in the ported box is it safe..voice coil heating and stuff..and for this installation will there be some sound diffrence than regular fitting in the ported box..besides if i put the sub oppsite internal volume of box increases coz the mangnet is out now so do i have to reduce the volume of the box accordingly..

and yes it is to save space nothn to show off..but i dont want to compromise with the quality

fred c had u experienced some tearing b4..jl subs are famous for durability and coz they are in warranty i dont care..i care for sound quality

two ppl gave me no big diffrence in sound quality and i totally disagree with fred in tearing jl subs..lil changes in box volume chnges its frequency responce..even reducing volume might help or might not..so plz do answer to the point plz not for just sake of ..ok just do it or dont do it...sm 1 who knows abt this perfectly

Answer 1

yea its safe. there are some pro's and con's tho
on the up side you can reduce the box volume by .25 - .5 cubic feet and you can see the pretty motor structure
on the con side though, the motor noise of the driver becomes much more apparent.

dont believe the horror stories.... if its a proper box you should be OK. i would deffinatly go sealed in that situation... and make sure you are 180 degrees out of phase.... wired backward

Answer 2

The air pressure inside the box will have the same effect on the subwoofer whether it's mounted with the face in or face out. If you want to do it, go ahead; there's no real reason not to.

As for the box volume, it depends on whether the original box volume guidelines took the sub structure volume into account or not. Normally if a particular box volume is recommended, the volume figure doesn't include the space taken up by the magnet and basket structure. If you were building the box for a conventionally mounted subwoofer, you might have to add additional volume to make up for the magnet. If you're putting the magnet on the outside you shouldn't have to alter the dimensions in any way. (Usually the difference isn't enough to substantially affect the sound quality, especially in a sealed box).

If you got your original dimensions from JL, I'd contact them and see if they factored the subwoofer structure into the volume recommendations. http://mobile.jlaudio.com/support_pages.php?page_id=128

Answer 3

Audio engineers have spent years and millions of dollars designing speaker enclosures. The box is designed to put a certain air pressure on the back of the speaker, a force against the magnetic push of the speaker cone. If the air pressure is in the wrong direction, the same direction as the magnetic forces, it will tear the speaker apart as soon as you turn it up.

If it worked, why has nobody in the world marketed an enclosure like that? Why does nobody publish plans for an enclosure like that? Be prepared to research, because if you just go ahead, you are going to be extremely disappointed.
http://www.electrosound.com/Speaker_Facts/v6no6.htm
http://www.mark1electronics.com/Speaker%20Design%20Utility.htm
http://www.carstereo.com/help/Articles.cfm
If you are going to install a speaker upside down, you need 2 speakers, one right side up, mounted in the box, and one upside down, mounted gasket to gasket. This is called an isobaric system. This lets you cut the enclosure in half, but you now need twice the power to get the same output.

Answer 4

Honestly don't waste your time on installing it upside down, the box you have was not intended for such a mounting, even though it would work the sound difference is minimal, then you don't have to worry about any internal volume problem.

Answer 5

Why do you want to mount the sub backwards? If it is to save space, then make sure to wire the sub backwards too.
Most people do this to either save space or to show off the sub basket and magnet.