making a subwoofer box...
Thread Starter
Burning Brakes
Joined: Mar 2007
Posts: 761
Likes: 1
From: Glendale, CA
making a subwoofer box...
I'm making my first subwoofer box from scratch. The specs for my subwoofers call for 1.5 cubic feet. The box is going to have 2 subs, side by side pointing forward and slightly up under the rear glass like a partition. Would it be best to separate the box or leave it open between the 2 subs (2 combined 1.5 cu ft boxes or 1 big 3 cu ft box)? Gonna be a sealed box.
Former Vendor
Joined: Nov 2005
Posts: 8,995
Likes: 2
From: Spring Texas
St. Jude Donor '08
You have a few options.
With a single chamber box, two subs will be fighting internal air pressure. You could wire one sub out of phase causeing the subs motions to rienforce eachother. This will give you deep booming bass especially at very low frequencies.
With a dual chamber box and both subs wire in phase, you'll have tighter bass and good bass drum reproduction.
With a single chamber box, two subs will be fighting internal air pressure. You could wire one sub out of phase causeing the subs motions to rienforce eachother. This will give you deep booming bass especially at very low frequencies.
With a dual chamber box and both subs wire in phase, you'll have tighter bass and good bass drum reproduction.
Team Owner
Joined: Feb 2000
Posts: 51,504
Likes: 6
From: Sacramento CA
If you wire one sub out of phase, you'll very likely have little to no bass at all.
Combined or separate, doesn't really matter much. Individual chambers leads to higher box strength if that matters to you. Shape is not very important.
Combined or separate, doesn't really matter much. Individual chambers leads to higher box strength if that matters to you. Shape is not very important.
Pro
Joined: May 2007
Posts: 744
Likes: 0
From: WayTooCloseToNY Northeast PA
Kale's right. You absolutely do NOT wire subs with opposing polarity, especially in the same enclosure space.
Separate internal volumes are almost always better, and in your instance a single larger enclosure with a separating partition would be the best way to go. The partition stiffens the box panels reducing efficiency losses through panel vibration.
Separate internal volumes are almost always better, and in your instance a single larger enclosure with a separating partition would be the best way to go. The partition stiffens the box panels reducing efficiency losses through panel vibration.
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Former Vendor
Joined: Nov 2005
Posts: 8,995
Likes: 2
From: Spring Texas
St. Jude Donor '08
Don't cram it your box with it though, just enough to fill it. If you put too much in your box it will start to rob airspace.
Thread Starter
Burning Brakes
Joined: Mar 2007
Posts: 761
Likes: 1
From: Glendale, CA
Melting Slicks
Joined: Mar 2004
Posts: 2,149
Likes: 6
From: NCCO Oklahoma
Ultimately... the larger the chamber, the lower the frequency that the box can play, effectively. Some boxes sound "okay" with zero poly fill, but all of the ones that I have built seem to sound a bit more 'smooth' when the poly fill has been added.
Good luck.
Mark
Former Vendor
Joined: Nov 2005
Posts: 8,995
Likes: 2
From: Spring Texas
St. Jude Donor '08
Safety Car
Joined: Sep 2008
Posts: 4,296
Likes: 156
From: Location: Location: kAnSaS
the polyfil makes the woofer think its in a bigger home!! Or its "PFM" Pure F_____ Magic,
Either way get sum from wally,, 1 lb per cubic foot is right on (see other post) good luck
Either way get sum from wally,, 1 lb per cubic foot is right on (see other post) good luck