one or two boxes?

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hightek

Copper - Posts: 223

Joined: July 26, 2004

Location: United States

Posted: September 10, 2004 at 2:37 PM / IP Logged

last night i was talking about my system with some friends and one of them said that i should put both subs into a sealed box instead of having seperate boxes for them. he said that sometims the subs will fire at different times and this can cause one sub to blow. i don't really believe him but i just wanted to get all of your thought, ideas, opinions, facts on the subject.

i'm making my own box(s) and i was looking at some on the web and even the dual sealed ones had a divider in them.

dxav

Silver - Posts: 314

Joined: September 11, 2002

Location: United States

Posted: September 10, 2004 at 3:19 PM / IP Logged

If you have 2 subs running mono from one amp, then single chamber will work fine. In any other situation, separate chambers should be used.

Good luck!

DXAV

jeffchilcott

Platinum - Posts: 2,483

Joined: April 11, 2002

Location: United States

Posted: September 10, 2004 at 3:35 PM / IP Logged

I almost always seperate my subs unless they are a lower series sub like a JL wo no matter sealed or vented I normaly devide chambers

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hightek

Copper - Posts: 223

Joined: July 26, 2004

Location: United States

Posted: September 10, 2004 at 6:04 PM / IP Logged

so if i were going to bridge the amp then i would want a single chamber box?

what if i bought two of the same amp would that be better than running one big one bridged?

kfr01

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Joined: April 30, 2003

Posted: September 10, 2004 at 6:28 PM / IP Logged

hightek wrote:

so if i were going to bridge the amp then i would want a single chamber box?

what if i bought two of the same amp would that be better than running one big one bridged?

I don't think that is what they said. I think they said:

If you don't bridge the amp then definitely use separate chambers.

If you do bridge the amp then a single chamber is O.K., but two chambers is optimal.

I totally agree with what they said, if for no reason other than two chambers will make the box more stiff and well braced.

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12-volt_guy

Copper - Posts: 53

Joined: September 10, 2004

Location: United States

Posted: September 10, 2004 at 7:44 PM / IP Logged

No two speakers are exactly alike, even if they are the same model. Manufacturing processes just aren't perfect. If you have two drivers in the same cavity, they are like to have slightly different characteristics and may affect each other's movement, resulting in some distortion.

This is the same reason they don't recommend a stereo amp configuration for two woofers in the same cavity; amplifier channels are different too and you'd have a similar problem, not to mention that stereo signals are different anyway. At least in a mono configuration, both woofers would get a more equal signal.

And the center divider tip probably is the best because enclosure rigidity is of utmost importance.

hightek

Copper - Posts: 223

Joined: July 26, 2004

Location: United States

Posted: September 10, 2004 at 7:45 PM / IP Logged

i know that two subs would definately sound louder than one but i'm worried about space and stuff after i shoved my model box in the trunk, it's huge. would it still sound alright putting one back there? i like to have the bump when i need but i also just like the little heart thumping you get when you turn it up. if i match a right amp to one sub is this still possible?

what i built smaller boxes and used polyfill?

hightek

Copper - Posts: 223

Joined: July 26, 2004

Location: United States

Posted: September 10, 2004 at 7:48 PM / IP Logged

so from what i'm gathering from 12-volt_guy is that it is better to have the subs wired in a mono configuration? i was thinking about having two seperate boxes? does this matter?

12-volt_guy

Copper - Posts: 53

Joined: September 10, 2004

Location: United States

Posted: September 10, 2004 at 8:13 PM / IP Logged

hightek wrote:

so from what i'm gathering from 12-volt_guy is that it is better to have the subs wired in a mono configuration? i was thinking about having two seperate boxes? does this matter?

Two separate boxes are fine. One "chamber", multiple woofers is what you should avoid, especially if not running mono.

Perhaps we should say "chamber" instead of "boxes", because a box is typically considered to be a unit, regardless of how many chambers it contains.

12-volt_guy

Copper - Posts: 53

Joined: September 10, 2004

Location: United States

Posted: September 10, 2004 at 8:20 PM / IP Logged

Additional note: When placing the woofer position in the box, do not center it in the box. Move it close to a wall. Centering drivers creates standing waves.

Also, if mounting two woofers in a single "box", it is best to mount them close together, like near the center divider. This allows acoustic coupling and improves bass output.

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