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Multi-Way Conventional loudspeakers with crossovers

Multiple Small Ports With Iso-Barik
Multiple Small Ports With Iso-Barik
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Old 12th April 2011, 06:36 AM   #1
Einric is offline Einric  United States
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Default Multiple Small Ports With Iso-Barik

I am designing a pair of SMALL monitors (.23 CuFt). I am looking at an Iso-Barik configuration with FIVE .545" ports. Three ports will fire front and Two will fire either rear or upward. What do you guys think?

Here is my theoretical curve.

I chose .545" because it is the ID measurement of a 1/2" Type L Copper Pipe. I can easily Flange it on both ends to reduce chuffing if needed.
Iso-Barik Multi-Port.png

Last edited by Einric; 12th April 2011 at 06:45 AM. Reason: Add Picture
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Old 12th April 2011, 06:47 AM   #2
Einric is offline Einric  United States
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A decent EQ can tune the 110hz Hump out and they should be theoretically phenomenal.
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Old 13th April 2011, 01:14 AM   #3
PeteMcK is offline PeteMcK
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why 5 ports? they will act the same as one larger dia port... (although with more turbulence)

however, this does beg the question, will a box with one rear firing port + one front firing port act the same as a push-push arrangement, for the freq range that the port is putting out?

Re: the hump, it's a bit hard to read your graph, but I'd tune the box a bit higher and you should be able to get a reasonably flat response (at the expense of some low end)
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Impedance varies with frequency, use impedance plots of your drivers and make crossover calculations using the actual impedance of the driver at the crossover frequency

Last edited by PeteMcK; 13th April 2011 at 01:20 AM.
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Old 13th April 2011, 01:38 AM   #4
Einric is offline Einric  United States
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I have an existing enclosure that has a maximum internal distance of only 7". A 2 inch port would have to be much longer than the space I have to fit the length in. Five .545" ports only need to be 4.96" long each. I am thinking of having three fire front and two will fire down. The Iso-Barik woofer firing to the rear will cause me enough placement issues so I don't want to have any rear ports.

So, the reason I chose 5 ports was to keep them small. I will flare both ends of the ports to reduce "Chuffing".
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