file Eminence 18 Scoop

12 years 11 months ago #12581 by bitzo
Replied by bitzo on topic Eminence 18 Scoop
ok but with a proper negative expansion?

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12 years 11 months ago #12582 by levyte357
Replied by levyte357 on topic Eminence 18 Scoop

bitzo wrote: ok but with a proper negative expansion?


EXACTLY AS PLANS STATE, but with previous mentioned external dimensions + 45° deflectors/braces added.

Can assure you, the only 18" scoops I have heard to match this design in terms of depth, SPL,throw are ASS S118, Stravens, or this design built full size.

EDIT:(Not heard wattcos yet)

\"When in Vegas, do as the vegasians do\".

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12 years 11 months ago #12583 by bitzo
Replied by bitzo on topic Eminence 18 Scoop
aye aye sir

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12 years 11 months ago #12585 by levyte357
Replied by levyte357 on topic Eminence 18 Scoop

bitzo wrote: aye aye sir


That's "MR Sir", if you don't mind... :lol:


\"When in Vegas, do as the vegasians do\".

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12 years 11 months ago #12586 by nickyburnell
Replied by nickyburnell on topic Eminence 18 Scoop
OK thats easy Lev, too wide though.
How much we losing if it's 636 wide?, ie 600 mouth

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12 years 11 months ago #12588 by levyte357
Replied by levyte357 on topic Eminence 18 Scoop

nickyburnell wrote: OK thats easy Lev, too wide though.
How much we losing if it's 636 wide?, ie 600 mouth

levyte357 wrote:

bitzo wrote: Prototyping is the definitive way to learn but a bit expensive for just an hobby.


When this cab is built H48", W24", 29"D, with approx 5" gap below rear baffle + corner bracing/deflectors, it gives stunning performance with these drivers and many similiar,



24"W is 610mm wide.. :lol:

25"W (636mm) would be even better.

\"When in Vegas, do as the vegasians do\".

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12 years 11 months ago #12590 by bitzo
Replied by bitzo on topic Eminence 18 Scoop
ok internal width 60 cm, depth from baffle 68.8 (72.5 minus 3*woodthickness). I modeled a duct to have the cornered negative expansion on the top right corner brace.
I put the eminence sim just for reference. 2pi sim pd1850 loaded.
[attachment=0:2gmjdjp6]<!-- ia0 -->eminence.jpg<!-- ia0 -->[/attachment:2gmjdjp6]
Attachments:

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12 years 11 months ago #12591 by levyte357
Replied by levyte357 on topic Eminence 18 Scoop

bitzo wrote: ok internal width 60 cm, depth from baffle 68.8 (72.5 minus 3*woodthickness). I modeled a duct to have the cornered negative expansion on the top right corner brace.


I estimate internal chamber depth to be: 245 - (30+18) = 197mm, is this what you're using to estimate chamber volume ?

Would leave the duct out of sim for now, and just model scoop in 3 segments,

throat to first corner
first corner to start of horn mouth
mouth start to end of horn mouth

Graph should basically say small peak around 43hz, dip 50-65, steeply rising to huge peak at 80hz.

However excursion graph should state minimum excursion at 40hz, which is why small chamber scoops like pre-amps.. smiley23

\"When in Vegas, do as the vegasians do\".

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12 years 11 months ago #12592 by nickyburnell
Replied by nickyburnell on topic Eminence 18 Scoop
Did this once.
was great[attachment=0:20itcavz]<!-- ia0 -->untitled.jpg<!-- ia0 -->[/attachment:20itcavz]
Attachments:

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12 years 11 months ago #12593 by levyte357
Replied by levyte357 on topic Eminence 18 Scoop

nickyburnell wrote: Did this once.
was great


Note the similarity to Eminence Design.

\"When in Vegas, do as the vegasians do\".

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