can i use 2 boxes instead of one bigger box ? and what is ( phase align ) ?

[big scott]

hi guys,

im just trying to plan this all out.

right now i have a ( 30x20x17 = w-h-d ) ported box at 34hz with a sq hdc3 15" sub.

im going to get another hdc315 and was going to build 1 big box for both but was thinking what if i build a box just like what i have for the other one ?

whats the difference ?

the 1 big box would have a divider in it anyway.

what do you guys think ?

also on the amp there a phase align nob, is that for using 2 subs ?

ill be using 1 amp per sub so would i turn the phase on one of the amps ?

im just not sure what that does.

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[brian84corvette 10+ year member]

subs that are the same exact thing are allowed to "share" internal box space. its not mandatory that each sub has its own seperate air space do do work in.

but it is nice to have 2 boxes so you can pull one out if you need some cargo area.

some will say that seperate ported boxes can cause cancelation as they act like two seperate things doing the same thing... i never realley understood that much but ive read multiple times so it must be somewhat acurate - also if your building the same seperate boxes they realley need to be exactly the same for the best results.

i built a pair of seperate boxes for my suburban in the ghetto burb loud for cheap build log

 

[Jeffdachef 5,000+ posts]

as long as they are the same dimensions, specs etc... and firing the same direction, you can expect to get louder and maintain similar sound quality. It might not be "as effective" as a single enclosure but the differences might not be even audible but its dependant on several different factors.

I had good results from using two identical enclosures before to fit things better.

You want all your speakers moving in the same direction. If you have your speaker wires backwards (out of phase), you can flip the switch instead of putting your wires the correct way. Also, Phase is used if your subs are mounted invertedly.

If one of your front speakers was wired backwards relative to the other, they would be 'out of phase' with one another. Very basically, what this causes is that when one speaker's woofer is 'vibrating' forward, the other is 'vibrating' backwards. The result is that the woofers' output 'cancels' one another and results in reduced perceived output

 

[MerkConvoy501]

as long as they are the same dimensions, specs etc... and firing the same direction, you can expect to get louder and maintain similar sound quality. It might not be "as effective" as a single enclosure but the differences might not be even audible but its dependant on several different factors.
I had good results from using two identical enclosures before to fit things better.

You want all your speakers moving in the same direction. If you have your speaker wires backwards (out of phase), you can flip the switch instead of putting your wires the correct way. Also, Phase is used if your subs are mounted invertedly.

If one of your front speakers was wired backwards relative to the other, they would be 'out of phase' with one another. Very basically, what this causes is that when one speaker's woofer is 'vibrating' forward, the other is 'vibrating' backwards. The result is that the woofers' output 'cancels' one another and results in reduced perceived output

So what do you mean by effective?

I ask because i have a four twelve box i am not happy with and i have a 2 12" box from when i was only running 2 12"s. I loved my 2 12 box . Instead of trying to fix my four 12 box i was thinking of building a second box to exactly match my 2 12 box.

 

[big scott]

ok heres one for you guys,

is it better to have both subs in the same air space ( 1 big box ) or have it divided, still 1 big box.

will i get more output using the same air space ? or ....

and yes both subs will be the same. ( sq hdc3 15" )

im just trying to figure this out before i get a box and find out , well it would be better if............

 

[mylows10 5,000+ posts]

That depends on what you are trying to get from your system. What I've seen. Is a shared chamber box will usually get louder and deeper bass than a separated chambered box. Now on the other aspect the dual chambered boxes usually will have tighter bass and be a bit more sq oriented than a shared box

 

[big scott]

That depends on what you are trying to get from your system. What I've seen. Is a shared chamber box will usually get louder and deeper bass than a separated chambered box. Now on the other aspect the dual chambered boxes usually will have tighter bass and be a bit more sq oriented than a shared box

wow that just the info i was looking for, thanks.

then im going with a one big asss box/ no divider with 2 15" ported. it will need to be 10 c/f or a little bigger.

 

[mylows10 5,000+ posts]

wow that just the info i was looking for, thanks.
then im going with a one big asss box/ no divider with 2 15" ported. it will need to be 10 c/f or a little bigger.

Mine is 9.5^3 ported at 30 hertz. It's pretty nasty

 

[big scott]

what do you have it in ?