Mc42's (Michel) 10P project - Page 2 - diyAudio
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Old 8th February 2014, 12:50 PM   #11
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I'm not entirely convinced that pipe harmonics provide the same 'clean sound as open baffles.' Without dimensions for the cabinet, difficult to assess technical performance, but it will conform to the known laws of physics. Be that as it may though, providing it does what you want it to do & you like the results, that's what counts.
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Old 8th February 2014, 04:28 PM   #12
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Hi Michel, Guys,
I'm glad Michel has posted an internal pic of his enclosure. Please check the attached pic to this post. Note the red area behind and each side of the driver has no damping. Omitting damping in these areas is not good. There's a real risk of back-wave cancellation effecting the driver's performance. In Michel's design, the internal back and side walls are so close to the driver, its 99% certain they will create some reflection onto the rear of the driver's cone.

As said, I'm all for guys experimenting but its still important to design a box that doesn't significantly compromise the driver's function.

Thanks
Mark.
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Old 8th February 2014, 04:37 PM   #13
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Expansion foam insulation ??? interesting
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Old 8th February 2014, 04:41 PM   #14
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Quote:
Originally Posted by paul burchell View Post
Expansion foam insulation ??? interesting
If so, it probably provides some panel damping, but being closed cell, does not provide any wave damping. It just takes up volume.

Bob
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Old 8th February 2014, 04:49 PM   #15
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I would assume by the spongy or bubbly look of ex foam when you cut into it that it would be considered open cell but that is just my assumption
but i guess the surface area when cured is smooth and not porous
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Old 8th February 2014, 05:58 PM   #16
4mc2 is offline 4mc2  Canada
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Quote:
Originally Posted by markaudio View Post
Hi Michel, Guys,
I'm glad Michel has posted an internal pic of his enclosure. Please check the attached pic to this post. Note the red area behind and each side of the driver has no damping. Omitting damping in these areas is not good. There's a real risk of back-wave cancellation effecting the driver's performance. In Michel's design, the internal back and side walls are so close to the driver, its 99% certain they will create some reflection onto the rear of the driver's cone.

As said, I'm all for guys experimenting but its still important to design a box that doesn't significantly compromise the driver's function.

Thanks
Mark.
Hi Mark , I can put some damping pad near back of driver for see if make a some differenc in sound .

I have tested the 10P in BR before and the sound from my design is more articulated .
He have only reflection near center axe that can return to back of driver but the all other reflexion ( 80% ) can not return ......... physic of wave

Anyway my ear love it ! ...... I am not the first ( some speaker compagnie from France ) that put the back wall very near the drive .
The compacted foam is for more rigid of wall

Last edited by 4mc2; 8th February 2014 at 06:01 PM.
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Old 8th February 2014, 09:02 PM   #17
4mc2 is offline 4mc2  Canada
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I have put a small pad around back of drive .......... and the sound if he have difference ,it's very subtle !

I have make a patern of reflexion .......... only the red can have some problem

======================

The best make your proper experience ........ it's the best scholl !
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Old 25th July 2014, 11:44 PM   #18
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Hi Mc,
I think other diyer's in the past have tried Alpair 12P on the basis that its closer to the Coral 8's size.

I recommend you try the Alpair 12P, better suited to the larger room size.

Thanks
Mark
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Old 26th July 2014, 12:05 AM   #19
4mc2 is offline 4mc2  Canada
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Hi Mark

Perhaps later !

You know the magnetic power inside the air gap ( voice coil .) .... in Maxwells... for the 12 P and 10P ?

I like to buy your Beta 8 for a friend that search one .

p.s. you know where I can rebuid a old voice coil ( burn ) for a Flat 8 with a copper/aluminum wire like your Alpair have ?

Thanks
Mike
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