10F/8424 & RS225-8 FAST / WAW Ref Monitor

[CGodecke]

SUPERB! I'm using plastic sports cones and still working on making them airtight.

Shame to have to slap dampening on them and then hide inside the main enclosures.

Cam

 

[turk 182]

Sadik what thickness is your foam?
how long/ tall are they?

is the dagger supposed to have a small opening at the narrow end?

 

[xrk971]

Nice work, Sadik. It would have been better to go with odd number of walls to reduce symmetric bell mode - but that’s ok as round cone seems to work too. Dagger should be sealed at end to prevent woofer from pressurizing it. Although if you tapered it and vented to outside via penetration on back wall, that would work too. I found no advantage to this though when Dagger was outside. I tried vented actually.

 

[zman01]

Sadik,

Good to see the build underway, and look forward to updates.

 

[Sadik]

Everything will be as per the design, thanks to Mr. XRK for sharing the same. The dagger will be closed at the conical end. the total length of dagger is 300 mm.

 

[soundnovice]

Nice work, Sadik. It would have been better to go with odd number of walls to reduce symmetric bell mode - but that’s ok as round cone seems to work too. Dagger should be sealed at end to prevent woofer from pressurizing it. Although if you tapered it and vented to outside via penetration on back wall, that would work too. I found no advantage to this though when Dagger was outside. I tried vented actually.

does the venting out of tapered end means the enclosure becomes aperiodic?

 

[xrk971]

Yes

 

[soundnovice]

Yes

Then it should help with flattening the impedence but again the driver is operated well away from impedence peak.

 

[xrk971]

Yes, not necessary and an added complication.

 

[turk 182]

Sadik if the dagger is 300 mm then the foam thickness is 13 mm, correct?

 

[wxn]

Slowly but surely the boxes are coming together. Had a few problems with dimensional accuracy of my cuts. Turns out 0.5mm is not good enough for really nice joints. Another lesson learned - do driver mounting holes before routing rebates and chamfers

 

[Sadik]

Sadik if the dagger is 300 mm then the foam thickness is 13 mm, correct?

Which Foam? The dagger is made from 8mm thick MDF sheet.

 

[turk 182]

sorry from the pinkish color (at least on my old monitor) i thought the material was an xps foam!

 

[xrk971]

XPS foam would work too.

 

[wxn]

Last photo before final assembly, cones in place

 

[turk 182]

oh, oh, my ocd is kicking in looking at that "last photo" (where's my scotch...) i would have put the unfaced damping on the back of the enclosure.

 

[xrk971]

Nice work Wxn! Don’t forget to add a good ball of fiberglass inside the cabinet. Put some around the crevices around Dagger too. You can of course, add that through driver cutout. I would add a piece of that padding on back wall where terminal cup is. That will ensure that back wave is absorbed substantially. And if you have more, add another on at least 1 sidewall. 3 walls will ensure no resonant modes are supported.

 

[wxn]

Thanks for the input, yes that's the plan. I will add some more layers of absorbing stuff through the hole and then a healthy amount of loose stuffing. I also have a large sheet of 1cm thick felt, not sure if I need to add any of that. We'll see

 

[CGodecke]

XPS Dagger

sorry from the pinkish color (at least on my old monitor) i thought the material was an xps foam!

I too thought it was foam, and cut so beautifully! Really seems like an ideal material for this application - easy to cut and glue, and should be easier to seal properly to the baffle compared to the sports cones currently in use. I think pentagonal pyramids will fit better in the tight spaces in my short cabinets.

Will use some black 3/16" Elmer's board for this attempt. The Black Daggers. And soon they will enclose a pair of 10f/8414g on order from Madisound.

Cam

 

[turk 182]

i know eh Sadik's joinery is to be saluted!
he should take a go at making some petal horns! i thought that when i saw the pic where you can see the inside of the dagger. (should heretofore be known as the "daggex" or should it be "xdag"...)