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Multi-Way Conventional loudspeakers with crossovers

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Old 22nd March 2013, 10:54 AM   #11
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Yes, it's an aluminium tube,I had the same resonating sound from a plastic tube ,only noticeable al very low frequency ,generated with a tone generator.I see Xavian also is using aluminium ports, so I don't know what to think, I was thinking the more rigid ,the better .

Thank you for your advice ,I will take this aspect into acount ,and will try to make some tests, before glue-ing the front baffle...
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Old 25th March 2013, 06:55 AM   #12
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Old 25th March 2013, 02:42 PM   #13
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The port placement is not ideal too, direct coupling with the woofer ?
Not really recommended.
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Old 25th March 2013, 03:51 PM   #14
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Quote:
Originally Posted by jerome69 View Post
The port placement is not ideal too, direct coupling with the woofer ?
Not really recommended.
Thank you for your post, we can always learn things, can you please talk a little more about this...
And if there is a problem with aluminium tubes please argue, if I will hear resonances I will aply somting antiresonant like Dynamat, or change the material.

PSthe woofer will not touch the port tube phisically...)
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Old 25th March 2013, 04:33 PM   #15
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This speaker reminds me something

jerome is right the port best placement should be on the bottom of the speaker back/front depends on personnal preference.

like this for example:

Click the image to open in full size.
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Old 25th March 2013, 04:48 PM   #16
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Ohoo,and welcome mister PandazYa!I warned you long time ago, that I'm coming.
The bottom is excluded because I have to raise them too much on spikes...But it's on the back,maybe to high? I have experiences with the same woofer and same port placement and had no problems.
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Old 25th March 2013, 05:59 PM   #17
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Quote:
Originally Posted by Aircirc View Post
Thank you for your post, we can always learn things, can you please talk a little more about this...
And if there is a problem with aluminium tubes please argue, if I will hear resonances I will aply somting antiresonant like Dynamat, or change the material.

PSthe woofer will not touch the port tube phisically...)
I can't justify this mathematically but understand when the source is too close the resonator, i call it "direct coupling", the mass of air in the rest of the box is not take into account. It is a short circuit of the rest of air in the box. Your bass reflex should not work well.
That's all, i can't explain more.

The metal tube is from Geralfino's experience, difficult to justify or argue.
The bass reflex tube is noisy at high frequency (800H-1K), it can stimulate tube frequency. You should choose it with a large diameter.
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Old 25th March 2013, 06:42 PM   #18
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In this case the woofers freq will be under 400hz, we'll see after measurements.
I will rethink the placement of the port if it's possible to move it far from the driver itself, the egeled back of the enclosure unfortunately raised the end of the tube

Last edited by Aircirc; 25th March 2013 at 06:44 PM.
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Old 14th April 2013, 01:52 PM   #19
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Baffle cuts:
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Old 14th April 2013, 05:29 PM   #20
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Where's the bracing in the woofer cabinet?

Since it's too late to add any substantial bracing, a piece of MDF from front to back with dowels top to bottom and side to side will help.
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