Small Ported Multi-speaker Box
09-12-2009, 11:03 AM
#1
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Small Ported Multi-speaker Box
I want to build a box for 3 computer speakers. It's 1x 4" woofer with 2x 3" uhh smaller speakers. I've drawn something up with 2 ports, but I'm completely guessing at what frequency they should be tuned to. I guessed 60 hertz.. This woofer is only 10 watts at 4 Ohms and thats all the info I have. Can anyone help with info on what frequencies this kind of speaker handles, or what I should tune the ports to? If lower than 60 hertz I'll change it to 1 port.
In the picture, the small speakers are sealed from the others. Box is (in inches) 9h x 16w x10d1 x6d2 The front face is slanted back, if it looks weird to you.
In the picture, the small speakers are sealed from the others. Box is (in inches) 9h x 16w x10d1 x6d2 The front face is slanted back, if it looks weird to you.
09-12-2009, 01:47 PM
#2
I want to build a box for 3 computer speakers. It's 1x 4" woofer with 2x 3" uhh smaller speakers. I've drawn something up with 2 ports, but I'm completely guessing at what frequency they should be tuned to. I guessed 60 hertz.. This woofer is only 10 watts at 4 Ohms and thats all the info I have. Can anyone help with info on what frequencies this kind of speaker handles, or what I should tune the ports to? If lower than 60 hertz I'll change it to 1 port.
In the picture, the small speakers are sealed from the others. Box is (in inches) 9h x 16w x10d1 x6d2 The front face is slanted back, if it looks weird to you.
In the picture, the small speakers are sealed from the others. Box is (in inches) 9h x 16w x10d1 x6d2 The front face is slanted back, if it looks weird to you.
First: where did the speakers come from? just build the same size box.
Second.. you are not going to get alot of bass out of a 4 inch 10watt speaker! plus you have no info on the driver and therefore you have no clue on how to tune the box or port.. In that case just put it in a sealed box about quarter cubic foot or so.
09-12-2009, 03:28 PM
#3
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My goals are to entertain myself with a little project, make a nice looking box, and since it will be a ported box it will increase the base from my 4" woofer. It actually sounds decent right now, except the plastic casing (which also has two small ports - the ones that widen like a bellmouth) rattles a bit and is quite ugly. My dimentions in the picture are for an appropriately sized box for this woofer, I just need help on the port. If nobody can add something on that note, I'll build based on my current plans (ports tuned at 60 hertz) and see how it turns out.
ps. The specs I can find for other 4" computer woofers seem to average 40-20 000 hertz frequency response.
pps. I'm not trying to make a great stereo out of junk parts. These are for occasional use on my computer when I watch a movie with someone, etc. Though, it could accept input from whatever else has a mini jack.
ps. The specs I can find for other 4" computer woofers seem to average 40-20 000 hertz frequency response.
pps. I'm not trying to make a great stereo out of junk parts. These are for occasional use on my computer when I watch a movie with someone, etc. Though, it could accept input from whatever else has a mini jack.
Last edited by Misuseofyou; 09-12-2009 at 03:38 PM.
09-12-2009, 07:29 PM
#8
My goals are to entertain myself with a little project, make a nice looking box, and since it will be a ported box it will increase the base from my 4" woofer. It actually sounds decent right now, except the plastic casing (which also has two small ports - the ones that widen like a bellmouth) rattles a bit and is quite ugly. My dimentions in the picture are for an appropriately sized box for this woofer, I just need help on the port. If nobody can add something on that note, I'll build based on my current plans (ports tuned at 60 hertz) and see how it turns out.
ps. The specs I can find for other 4" computer woofers seem to average 40-20 000 hertz frequency response.
pps. I'm not trying to make a great stereo out of junk parts. These are for occasional use on my computer when I watch a movie with someone, etc. Though, it could accept input from whatever else has a mini jack.
ps. The specs I can find for other 4" computer woofers seem to average 40-20 000 hertz frequency response.
pps. I'm not trying to make a great stereo out of junk parts. These are for occasional use on my computer when I watch a movie with someone, etc. Though, it could accept input from whatever else has a mini jack.
Speaker design is complex and a set of compromises. Your computer speakers are a compromise between efficiency and bass output. You will not get much more bass by playing with the ports because you will then be limited by the *very limited* xmax of those woofers which will have no damping below the port resonance. Just like a car subwoofer.
If you really want to do a ported design just for fun.. Buy a woofer whose T/S parameters you know (check the sale section at www.solen.ca) and use a woofer design software such as WinISD pro you can get for free at www.linearteam.dk.
09-26-2009, 11:18 AM
#9
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Join Date: Feb 2008
Posts: 158
you don't really need the box that wide or big in general for what your trying to achieve with a low power 4 inch sub for computer a 16wide box is was to big even two 1x2.5 ports are going to be to big because that little sub won't move enough air to utalize them. just my two cents
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