Multiple Small Ports With Iso-Barik

Einric · 06:45 AM

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

Einric · 12th April 2011, 06:47 AM

A decent EQ can tune the 110hz Hump out and they should be theoretically phenomenal.

PeteMcK · 01:20 AM

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)

Einric · 13th April 2011, 01:38 AM

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".

12th April 2011, 06:36 AM	#1
Einric diyAudio Member Join Date: Feb 2011 Location: Bozeman, MT	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

13th April 2011, 01:14 AM	#3
PeteMcK diyAudio Member Join Date: Feb 2002 Location: Sydney	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) __________________ ‘today… there lives alongside the twentieth century the tenth or thirteenth. A hundred million people use electricity and still believe in the magic power of signs and exorcisms” Trotsky Last edited by PeteMcK; 13th April 2011 at 01:20 AM.

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12th April 2011, 06:47 AM	#2
Einric diyAudio Member Join Date: Feb 2011 Location: Bozeman, MT	A decent EQ can tune the 110hz Hump out and they should be theoretically phenomenal.

13th April 2011, 01:38 AM	#4
Einric diyAudio Member Join Date: Feb 2011 Location: Bozeman, MT	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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