I am planning on building a box for two 6" JL Audio subs. Should I create two seperate enclosures in the sub box? I have heard of some people who run two or three subs in a box with no seperate enclosures. Just one large space. What are the advantages/disadvantages? Thanks to any who reply.

 

an enclosure that houses 2 or more subs in "just one large space" is called a "Common chamber enclosure". If you do this, you will wanna run all the subs bridged together (mono) so that all subs run off the same channel. If you ran them on sepreate channels (R or L) then it will sound pretty ugly



btw, why only 6" subs?

 

if they'll be in a sealed box, seperate them into chambers....


I'll be throwing 600watts to a pair of these 6.5" subs... look into them...
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Seperate them you can gain more spl... also somtimes when you go over 2 subs in a common box you run the risk of one of the subs being pushed the oppisite way then the others cuz of the common chamber

 

^^ why would one do something different than the other if they're splitting the powered signal?

 

nevermind.....

 

My plan is to keep everything stealth without messing with anything too much. I will be making a sealed box to hold two jl audio 6w0's (not sure if I will get the 4ohm or 8 ohm subs) wired in parallel that will be installed where the small cargobox is on the right side of the spare. Very little room in the xA. I will be running these off of a jl audio e1200 amp. The sub box will be a little too small for the proper air space so I will throw in some polyfil. So would a common enclosure sound better, or seperate enclosures? Looking for good sounding bass.

 

Either way really since you've only got 2 subs..... My theory is: with more than 2 subs in a common chambered sealed box, the motor pressure from the cones inward movement on 2 of 3 subs plus the pressure already in the box will be greater than the motor strength of the one remaining sub and force it's motor/cone outward....

seperate them if you want to take safe measure....

 

^^^On the other hand, since your already limited in space, you can gain alittle more air space back and get alittle closer to optimum by not using a divider.

A divider is always recommended but getting the proper air space is too. A little more air space will let those subs play alittle lower. Since your wiring two identical(model) speakers in parallel they should be close enough to identical to not really cause you any serious heartache, JL has pretty good quality control.

 

Yea I just said it in lameon terms... lol

 

Or you can just fiberglass its really not that hard its the prep at the end thats hard

 

Power Handling 150 Watts RMS
Sensitivity 85dB

Too softcore for me

 

............wait!! I just watched the video.....I'm shocked!

 

They may only have a Sensitivity of 85db but the excursion for 7" subs is pretty damn good. Two of them actually sound like a single 10".

 

I made a cardboard prototype of my enclosure after work today. I just need to do a little tweaking and I should have an awesome fit. Here are some pics. A little blurry. It was dark out.

 

^^ awesome rendering of the cone......

 

I'm with tC that's a nice rendering. If you're willing to work with fiberglass it looks like you might be able to gain some more space, heck run 2 more on the other side if you can. Otherwise, perhaps you could massage a single 10 in there. In my experience/reading I don't see any real advantage in seperate chambers (except when receiving different signals) other than strength. Those that say the pressure is higher forget that by expanding the size of the chamber by 2 would keep the pressure constant. Mark

 

^^ that's primarily with more than 2 subs though....mandos(chris) told me Keith up there^^ had that problem with 4 subs in a common chambered enclosure...one was being pushed out when they were all supposed to be going inward.....

 

If they're all in phase and receiving the same signal there is absolutely no reason any of them should or would move in a different direction. Mark

 

Actually,

If you put enough subs in a common chambered box, there is a chance that one of them will not have the motor force to move the same.

Speakers are built on tolerances, once you have enough speakers, the tolerances may be different enough that one doesn't work as designed.

Also, with almost every speaker I've seen, the natural resting position of the speaker will change depending on the frequency. Like with a 80Hz tone going through a speaker, it naturally rises a bit. You have say, 3 speakers rising, and the 4th one, if it's motor can't overcome the missing airspace in the box, will drop.

Of course, with a ported box this isn't an issue since there isn't a vacuum created inside the box.

Trust me...it does happen...Keith can confirm it.