could i be doing damage?

[Sabby]

i have 2 12 inch subs, in the same box.
the magnets are about 25cm apart.
jus wondering if i am doing any damage becuase of the pressure inside the box.
any help is appreciated.

p.s it gives a great thumpin bass note

[wrx884]

as long as theres a partition between the 2 subs inside ur box i cant see the pressure inside the box doin ne damage 2 ur subs but from the pic i assume u dont? if not eventually 1 sub will over work the other and eventually burn it out

[Sabby]

as long as theres a partition between the 2 subs inside ur box i cant see the pressure inside the box doin ne damage 2 ur subs but from the pic i assume u dont? if not eventually 1 sub will over work the other and eventually burn it out

hmm, wouldnt a partition make the bass different? being that it will be 2 small seperate boxes in the one.
i dont have a partition at the moment so if i keep having just the subs and the box in 1, i will wreck 1 sub?

[wrx884]

yer u will and mayb half damage the other as they will b kinda competing against themselves if u know wat i mean?

if u build each section 2 the subs specs u shouldnt have a problem with gettin less bass hope that helps man

[Sabby]

thanks mate.
i actually found this old sub box around the house.
i gotta find some specs somwhow.
cheers mate

[wrx884]

post up the sub name and number im sure some1 will b able 2 find them 4 ya

[vp_5ltr]

if the magnets are too close together it can create a magnetic field .. witch can make them sound bad by simply draining power from them

try inverting them buddy

[Joe Peeps]

Maybe im missing something but i dont see how that configuration will damage the woofers? Also, the magnets are 25cm apart which is plenty and he wont have to worry about magnetic interference

I thought the only time a single large sealed chamber would cause problems was if one woofer blew, the other one could get damaged.

[Sabby]

they are cadence 12inch ultradrives, 350/500 rms/peak

would inverting them still damage or burn out?
ill have to try that.
and i dont think the magnets are being affected coz it sounds really good, and i mean, its loud.

[calais_cruzin]

You could turn it so that its a push pull set up, have one sub in normally and have the other inverted.

This will make it so the subs wont damage each other as wen one goes in the other goes out, there would be no pressure agaist the subs, but then u have the basket of one hangin out.

Wont look that flash but will do the job without any damage

It is hard to get the subs to go push out the same amount if there both in normally as its wen one pumps more than the other that could cause sum damage

[Tasmaniak]

you won't necessarily damage the subwoofers. Maybe over a space of 5years with solid work everyday but normal conditions. No, you won't damage them.

BUT

What can happen is when they pull inboth woofers are trying to pressurize the box at the same time. Now what this means is that there is the potential for the subs to NOT move in as far as they should because of the pressure the other sub is building at the same time. Now, whilst over long term this could cause damage, in the short term you will be facing distorted sound quality because the sub is not able to move as freely as it would like.

You have two options...

Remove one side of the box and pout a partition exactly into the centre. Don't worry about the subs only having half the enclosure. With the two subs in the one box...they only had half the enclosure anyway.

OR

Fill the box with a polyester filling. How much? As much as you can get in there. This will create whats called an "infinite baffle" where the driver is tricked into thinking that the box it's mounted in is huge.

[garfa]

ray:with you saying that when both the subs are excursed inwards could cause pressure problems, they are in effectively twice the space so presure will be the same. so SQ shouldn't be effected....right?

[StoneX]

Exactly... One sub pressurising X amount of space is the same as 2 subs pressurising 2X of space.

[wrx884]

thats providing that the box has been built 2 specs 2 cater 4 the 2 subs wouldnt it tho? if its undersize wouldnt u get problems of the subs not moving inwards as much as they should there fore loosing SQ?

[StoneX]

No, not losing SQ, just losing output because they'd have less excursion.

Also, the pressurising the box when the subs moves in requires the same force as creating the vacuum inside the box when moving outwards.

[phat_com]

if you wire one sub + to + and - to - and then the other sub + to - and - to + it should be fine.

[garfa]

Exactly... One sub pressurising X amount of space is the same as 2 subs pressurising 2X of space.

yes so why is 12volt saying it could be a problem???

[StoneX]

I don't know... Ask HIM to explain his reasons.

It's just basic physics.

[Tasmaniak]

He did, but I didn't answer him at the time...so you answered LOL

It comes down to basic air movement.

As the cones move backwards towards each other, they must deal with their own pressurised air bouncing off the walls and trying to push the sub back out (Which is what you want!) but it must also deal with the air volume fromt the other subs pressurised air pushing against it, thus changing the dynamics.

The exact same thing happens in reverse when the subs try to create a vacumm.

[VKCOMMO]

love the technical drawing

[holdenboy]

2 1/2 year old thread....

[StoneX]

Yeah, love the bump and the false information given at the start of the thread.